Question

以下是放大和缩小的基本代码：https://codepen.io/kidsdial/pen/ROBpgM，

现在我试图将代码集成到我的项目中。

背景：

用户单击蒙版，然后将自己的图像上传到蒙版上。
上传图片后，图片上会显示“编辑文本”。
一旦用户单击编辑文本，我们就会显示弹出框。
显示放大和缩小按钮。

问题：

当我们单击该按钮时，用户上传的图像没有缩放。

Video link

Codepen：https://codepen.io/kidsdial/pen/PgxegO

提琴：https://jsfiddle.net/kidsdial1/nhswfjr3/

var target;
const imageUrl = "https://i.imgur.com/RzEm1WK.png";

let jsonData = {
    "layers": [{
        "x": 0,
        "height": 612,
        "layers": [{
                "x": 160,
                "src": "ax0HVTs.png",
                "y": 291,
                "height": 296,
                "width": 429,
                "name": "mask_1"
            },
            {
                "x": 25,
                "src": "hEM2kEP.png",
                "height": 324,
                "width": 471,
                "y": 22,
                "name": "mask_2"
            }
        ],
        "y": 0,
        "width": 612
    }]
};

const containerElement = $('#container');
const fileUp = $('#fileup');

$(function() {

    // Upload image onclick mask image 

    containerElement.click(function(e) {
        var res = e.target;
        target = res.id;
        console.log(target);
        if (e.target.getContext) {
            // click only inside Non Transparent part
            var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
            if (pixel[3] === 255) {
                setTimeout(() => {
                    $('#fileup').click();
                }, 20);
            }
        }
    });

    // Fetch mask images from json file - IGNORE this code

    function getAllSrc(layers) {
        let arr = [];
        layers.forEach(layer => {
            if (layer.src) {
                arr.push({
                    src: layer.src,
                    x: layer.x,
                    y: layer.y,
                    height: layer.height,
                    width: layer.width,
                    name: layer.name
                });
            } else if (layer.layers) {
                let newArr = getAllSrc(layer.layers);
                if (newArr.length > 0) {
                    newArr.forEach(({
                        src,
                        x,
                        y,
                        height,
                        width,
                        name
                    }) => {
                        arr.push({
                            src,
                            x: (layer.x + x),
                            y: (layer.y + y),
                            height,
                            width,
                            name: (name)
                        });
                    });
                }
            }
        });
        return arr;
    }

    function json(data)

    {
        var width = 0;
        var height = 0;

        let arr = getAllSrc(data.layers);

        let layer1 = data.layers;
        width = layer1[0].width;
        height = layer1[0].height;
        let counter = 0;
        let table = [];

        // container dimensions
        containerElement.css('width', width + "px").css('height', height + "px").addClass('temp');
        //end

        for (let {
                src,
                x,
                y,
                name
            } of arr) {

            //Get Height and width of mask image [ edit button ]
            var ImagePosition = arr;
            //code end

            var mask = $(".container").mask({
                imageUrl: imageUrl,

                // Fetch Mask images
                maskImageUrl: 'https://i.imgur.com/' + src,
                // end

                onMaskImageCreate: function(img) {
                    // Mask image positions
                    img.css({
                        "position": "absolute",
                        "left": x + "px",
                        "top": y + "px"
                    });
                    // end

                },
                id: counter
            });
            table.push(mask);
            fileup.onchange = function() {

                let mask2 = table[target];
                const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
                document.getElementById('fileup').value = "";

                //  Edit image - IGNORE this code

                if ($(".masked-img" + newImageLoadedId).length === 1) {
                    $("<span class=\"pip pip" + newImageLoadedId + "\">" +
                        "<a onclick='document.getElementById(\"dark" + newImageLoadedId + "\").style.display=\"block\";'><span class=\"edit edit" + newImageLoadedId + "\" >Edit </span></a>" +
                        "</span>").insertAfter(".masked-img" + newImageLoadedId).css({
                        "left": ImagePosition[newImageLoadedId].x + (ImagePosition[newImageLoadedId].width / 2) + "px",
                        "top": ImagePosition[newImageLoadedId].y + (ImagePosition[newImageLoadedId].height / 2) + "px"
                    });;
                    $("<div id=\'dark" + newImageLoadedId + "\' class=\'dark_content\'>" +
                        $('#demoTemplate').html() +
                        "<a href=\"javascript:void(0)\" onclick=\"document.getElementById(\'dark" + newImageLoadedId + "\').style.display=\'none\'\">Close</a>" + "</div>").appendTo(".pip" + newImageLoadedId).css({
                        "left": $('.edit' + newImageLoadedId).width() + 2 + "px",
                        "top": "0px"
                    });
                }
                //  end                
            };
            counter++;
        }
    }
    json(jsonData);
}); // end of function

// Image code

(function($) {
    var JQmasks = [];
    $.fn.mask = function(options) {
        // This is the easiest way to have default options.
        var settings = $.extend({
            // These are the defaults.
            maskImageUrl: undefined,
            imageUrl: undefined,
            scale: 1,
            id: new Date().getUTCMilliseconds().toString(),
            x: 0, // image start position
            y: 0, // image start position
            onMaskImageCreate: function(div) {},
        }, options);


        var container = $(this);

        let prevX = 0,
            prevY = 0,
            draggable = false,
            img,
            canvas,
            context,
            image,
            timeout,
            initImage = false,
            startX = settings.x,
            startY = settings.y,
            div;

        container.mousePosition = function(event) {
            return {
                x: event.pageX || event.offsetX,
                y: event.pageY || event.offsetY
            };
        }

        container.selected = function(ev) {
            var pos = container.mousePosition(ev);
            var item = $(".masked-img canvas").filter(function() {
                var offset = $(this).offset()
                var x = pos.x - offset.left;
                var y = pos.y - offset.top;
                var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
                return d[0] > 0
            });

            JQmasks.forEach(function(el) {
                var id = item.length > 0 ? $(item).attr("id") : "";
                if (el.id == id)
                    el.item.enable();
                else el.item.disable();
            });
        };

        container.enable = function() {
            draggable = true;
            $(canvas).attr("active", "true");
            div.css({
                "z-index": 2
            });
        }

        container.disable = function() {
            draggable = false;
            $(canvas).attr("active", "false");
            div.css({
                "z-index": 1
            });
        }

        container.getImagePosition = function() {
            return {
                x: settings.x,
                y: settings.y,
                scale: settings.scale
            };
        };

        container.updateStyle = function() {
            return new Promise((resolve, reject) => {
                context.beginPath();
                context.globalCompositeOperation = "source-over";
                image = new Image();
                image.setAttribute('crossOrigin', 'anonymous');
                image.src = settings.maskImageUrl;
                image.onload = function() {
                    canvas.width = image.width;
                    canvas.height = image.height;
                    context.drawImage(image, 0, 0, image.width, image.height);
                    div.css({
                        "width": image.width,
                        "height": image.height
                    });
                    resolve();
                };
            });
        };

        function renderInnerImage() {
            img = new Image();
            img.setAttribute('crossOrigin', 'anonymous');
            img.src = settings.imageUrl;
            img.onload = function() {
                settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
                settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
                context.globalCompositeOperation = 'source-atop';
                context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
                initImage = false;
            };
        }

        // change the draggable image

        container.loadImage = function(imageUrl) {
            console.log("load");
            settings.y = startY;
            settings.x = startX;
            prevX = prevY = 0;
            settings.imageUrl = imageUrl;
            initImage = true;
            container.updateStyle().then(renderInnerImage);
            // sirpepole  Add this
            return settings.id;
        };

        container.loadMaskImage = function(imageUrl, from) {
            canvas = document.createElement("canvas");
            context = canvas.getContext('2d');
            canvas.setAttribute("draggable", "true");
            canvas.setAttribute("id", settings.id);
            settings.maskImageUrl = imageUrl;
            div = $("<div/>", {
                "class": "masked-img"
            }).append(canvas);

            // div.find("canvas").on('touchstart mousedown', function(event)
            div.find("canvas").on('dragstart', function(event) {
                if (event.handled === false) return;
                event.handled = true;
                container.onDragStart(event);
            });

            div.find("canvas").on('touchend mouseup', function(event) {
                if (event.handled === false) return;
                event.handled = true;
                container.selected(event);
            });

            div.find("canvas").bind("dragover", container.onDragOver);
            container.append(div);
            if (settings.onMaskImageCreate)
                settings.onMaskImageCreate(div);
            container.loadImage(settings.imageUrl);
        };
        container.loadMaskImage(settings.maskImageUrl);
        JQmasks.push({
            item: container,
            id: settings.id
        })
        // Edit image
        div.addClass('masked-img' + settings.id);
        // end
        return container;
    };
}(jQuery));

// Zoom 

//document.getElementById("img").src = json(data);

var angle = 0;
var scale = 1;
var $img = $('#image');

$img.on('transform', function() {
    $img.css('transform', `rotate(${angle}deg) scale(${scale})`);
});

$('.js-zoom-in').on('click', function() {
    scale += 0.25;
    if (scale == 2.25) {
        scale = 2;
    };
    $img.trigger('transform');
});

$('.js-zoom-out').on('click', function() {
    scale -= 0.25;
    if (scale == 0) {
        scale = 0.25;
    }
    $img.trigger('transform');
});

.container {
	background: silver;
	position: relative;
	
}

.container img {
	position: absolute;
	top: 0;
	bottom: 250px;
	left: 0;
	right: 0;
	margin: auto;
	z-index: 999;
}

.masked-img {
	overflow: hidden;
	position: relative;
}

.pip {
	display: inline-block;
	margin: 0;
	position: absolute;
}

.edit {
	display: block;
	background: #444;
	border: 1px solid black;
	color: white;
	text-align: center;
	cursor: pointer;
	position: absolute;
	z-index: 3;
}

.edit:hover {
	background: white;
	color: black;
	position: absolute;
	z-index: 3;
}

.dark_content {
	display: none;
	position: relative;
	top: 25%;
	left: 25%;
	width: 250px;
	height: 250px;
	padding: 16px;
	border: 16px solid orange;
	background-color: white;
	z-index: 1002;
	overflow: auto;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>

<input id="fileup" name="fileup" type="file" style="display:none" >

<div id="container"class="container">
</div>

<template id='demoTemplate'>
   <span>
      <div class="btn-group">
         <button type="button" class="js-zoom-in">Zoom In</button>
         <button type="button" class="js-zoom-out">Zoom Out</button>         
      </div>
      <img id="image" src ="" style ="display:none">             
   </span>
</template>

注意：如果有人给我解决方案，我将给予150点奖励积分。

Answer 1

您还有一些示波器问题，还有其他一些问题。我尝试发表评论。我还解决了缺少和多余分号的问题。

我创建了一个全局对象myApp.来保存内容，而不是大量的全局变量。

可用性：“ +”号要求上传一些内容，但是（我不清楚）马上要做什么，用户可能还会注意到-但这不是事实。我没有看到这些“编辑”或类似内容，因此您的缩放可能包裹在丢失的代码中？我在那里不知道。

现在问题：放大图像-您的“上载”正在渗入，您在画布上有重复的ID。我对您要想做得更好的尝试还不够了解。

var myApp = myApp || {};
myApp.target = {};
myApp.imageUrl = "https://i.imgur.com/RzEm1WK.png";
myApp.jsonData = {
  "layers": [{
    "x": 0,
    "height": 612,
    "layers": [{
        "x": 160,
        "layers": [{
          "x": 0,
          "src": "ax0HVTs.png",
          "y": 0,
          "height": 296,
          "width": 429,
          "name": "L2b-1"
        }],
        "y": 291,
        "name": "user_image_1"
      },
      {
        "x": 25,
        "layers": [{
          "x": 0,
          "src": "hEM2kEP.png",
          "height": 324,
          "width": 471,
          "y": 0,
          "name": "L2C-1"
        }],
        "y": 22,
        "name": "L2"
      }
    ],
    "y": 0,
    "width": 612,
    "name": "L1"
  }]
};


// Below code will fetch mask images from json file
function getAllSrc(layers) {
  let arr = [];
  layers.forEach(layer => {
    if (layer.src) {
      arr.push({
        src: layer.src,
        x: layer.x,
        y: layer.y,
        height: layer.height,
        width: layer.width,
        name: layer.name
      });
    } else if (layer.layers) {
      let newArr = getAllSrc(layer.layers);
      if (newArr.length > 0) {
        newArr.forEach(({
          src,
          x,
          y,
          height,
          width,
          name
        }) => {
          arr.push({
            src,
            x: (layer.x + x),
            y: (layer.y + y),
            height,
            width,
            name: (name)
          });
        });
      }
    }
  });
  return arr;
}

function json(data) {
  var width = 0;
  var height = 0;
  let arr = getAllSrc(data.layers);
  let layer1 = data.layers;
  width = layer1[0].width;
  height = layer1[0].height;
  let counter = 0;
  let table = [];
  for (let {
      src,
      x,
      y,
      name
    } of arr) {
    let csize = {
      'width': width + "px",
      'height': height + "px"
    };
    $(".container")
      .css(csize)
      .addClass('temp');
    //Get Height and width of mask image [ edit button ]
    var ImagePosition = arr;
    //code end
    var mask = $(".container").mask({
      imageUrl: myApp.imageUrl,
      // where is src defined?
      maskImageUrl: 'https://i.imgur.com/' + src,
      onMaskImageCreate: function(img) {
        // Mask image positions
        img.css({
          "position": "absolute",
          "left": x + "px",
          "top": y + "px"
        });
        // code end
      },
      id: counter
    });
    table.push(mask);
    fileup.onchange = function() {
      let mask2 = table[myApp.target];
      const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
      document.getElementById('fileup').value = "";
      //  Edit image
      let mskimg = $(".masked-img" + newImageLoadedId);
      if (mskimg.length === 1) {
        let mySpan = $("<span class='pip'></span>");
        mySpan.addClass("pip" + newImageLoadedId);
        let darkId = "dark" + newImageLoadedId;
        let myA = $("<a onclick='document.getElementById('" + darkId + "').style.display=\"block\";'></a>");
        let linkSpan = $("<span class='edit'>Edit</span>")
          .addClass("edit" + newImageLoadedId);
        myA.append(linkSpan);
        mySpan.append(myA)
          .insertAfter(mskimg)
          .css({
            "left": ImagePosition[newImageLoadedId].x + (ImagePosition[newImageLoadedId].width / 2) + "px",
            "top": ImagePosition[newImageLoadedId].y + (ImagePosition[newImageLoadedId].height / 2) + "px"
          });
        $("<div id='" + darkId + "' class='dark_content'></div>").append($('#demoTemplate').html() +
            "<a href='javascript:void(0)' onclick=\"document.getElementById('" + darkId + "').style.display='none'\">Close</a>")
          .appendTo(".pip" + newImageLoadedId)
          .css({
            "left": $('.edit' + newImageLoadedId).width() + 2 + "px",
            "top": "0px"
          });
      }
      // Edit code end here....        
    };
    counter++;
  }
}

$(function() {
  // below code will upload image onclick mask image
  $('.container').click(function(e) {
    var res = e.target;
    myApp.target = res.id;
    console.log("target:", myApp.target);
    if (e.target.getContext) {
      // click only inside Non Transparent part
      var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
      if (pixel[3] === 255) {
        setTimeout(() => {
          $('#fileup').click();
        }, 20);
      }
    }
  });

  json(myApp.jsonData);
}); // end of document ready

// jq plugin 

(function($) {
  var JQmasks = [];
  $.fn.mask = function(options) {
    // This is the easiest way to have default options.
    var settings = $.extend({
      // These are the defaults.
      maskImageUrl: undefined,
      imageUrl: undefined,
      scale: 1,
      id: new Date().getUTCMilliseconds().toString(),
      x: 0, // image start position
      y: 0, // image start position
      onMaskImageCreate: function(div) {},
    }, options);

    var container = $(this);

    let prevX = 0,
      prevY = 0,
      draggable = false,
      img,
      canvas,
      context,
      image,
      timeout,
      initImage = false,
      startX = settings.x,
      startY = settings.y,
      div;

    container.mousePosition = function(event) {
      return {
        x: event.pageX || event.offsetX,
        y: event.pageY || event.offsetY
      };
    };

    container.selected = function(ev) {
      var pos = container.mousePosition(ev);
      var item = $(".masked-img canvas").filter(function() {
        var offset = $(this).offset();
        var x = pos.x - offset.left;
        var y = pos.y - offset.top;
        var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
        return d[0] > 0;
      });

      JQmasks.forEach(function(el) {
        var id = item.length > 0 ? $(item).attr("id") : "";
        if (el.id == id)
          el.item.enable();
        else el.item.disable();
      });
    };

    container.enable = function() {
      draggable = true;
      $(canvas).attr("active", "true");
      div.css({
        "z-index": 2
      });
    };

    container.disable = function() {
      draggable = false;
      $(canvas).attr("active", "false");
      div.css({
        "z-index": 1
      });
    };

    container.getImagePosition = function() {
      return {
        x: settings.x,
        y: settings.y,
        scale: settings.scale
      };
    };

    container.updateStyle = function() {
      return new Promise((resolve, reject) => {
        context.beginPath();
        context.globalCompositeOperation = "source-over";
        image = new Image();
        image.setAttribute('crossOrigin', 'anonymous');
        image.src = settings.maskImageUrl;
        image.onload = function() {
          canvas.width = image.width;
          canvas.height = image.height;
          context.drawImage(image, 0, 0, image.width, image.height);
          div.css({
            "width": image.width,
            "height": image.height
          });
          resolve();
        };
      });
    };

    function renderInnerImage() {
      img = new Image();
      img.setAttribute('crossOrigin', 'anonymous');
      img.src = settings.imageUrl;
      img.onload = function() {
        settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
        settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;
        context.globalCompositeOperation = 'source-atop';
        context.drawImage(img, settings.x, settings.y, img.width * settings.scale, img.height * settings.scale);
        initImage = false;
      };
    }

    // change the draggable image

    container.loadImage = function(imageUrl) {
      //  console.log("load");
      //if (img)
      // img.remove();
      // reset the code.
      settings.y = startY;
      settings.x = startX;
      prevX = prevY = 0;
      settings.imageUrl = imageUrl;
      initImage = true;
      container.updateStyle().then(renderInnerImage);
      // sirpepole  Add this
      return settings.id;
    };

    // change the masked Image
    container.loadMaskImage = function(imageUrl, from) {
      canvas = document.createElement("canvas");
      context = canvas.getContext('2d');
      canvas.setAttribute("draggable", "true");
      // invalid to have same id
      let cvl = $('canvas').length;
      console.log("cvl:",cvl,"sid:",settings.id);
      canvas.setAttribute("id", settings.id);
      settings.maskImageUrl = imageUrl;
      div = $("<div/>", {
        "class": "masked-img"
      }).append(canvas);

      // div.find("canvas").on('touchstart mousedown', function(event)
      div.find("canvas").on('dragstart', function(event) {
        if (event.handled === false) return;
        event.handled = true;
        container.onDragStart(event);
      });

      div.find("canvas").on('touchend mouseup', function(event) {
        if (event.handled === false) return;
        event.handled = true;
        container.selected(event);
      });

      div.find("canvas").bind("dragover", container.onDragOver);
      container.append(div);
      if (settings.onMaskImageCreate){
        settings.onMaskImageCreate(div);}
      container.loadImage(settings.imageUrl);
    };
    container.loadMaskImage(settings.maskImageUrl);
    JQmasks.push({
      item: container,
      id: settings.id
    });
    // Edit image
    div.addClass('masked-img' + settings.id);
    // code end
    return container;
  };
}(jQuery));

//Zoom in , Zoom out , Rotate code
// assume change data to myApp.jsonData
// in the template so, it does not find it? wrong ID? terrible id
//document.getElementById("img").src = json(data);
//document.getElementById("template-image").src = json(myApp.jsonData);

// probably should namespace these
myApp.angle = 0;
myApp.scale = 1;
myApp.$img = $('.template-image').eq(0);
// moved from above, use the revised id (class)
myApp.$img.prop("src", json(myApp.jsonData));
myApp.$img.on('transform', function() {
  $(this).css('transform', `rotate(${myApp.angle}deg) scale(${myApp.scale})`);
});

$('.js-rotate-right').on('click', function() {
  myApp.angle += 15;
  myApp.$img.trigger('transform');
});

$('.js-rotate-left').on('click', function() {
  myApp.angle -= 15;
  myApp.$img.trigger('transform');
});

$('.js-zoom-in').on('click', function() {
  myApp.scale += 0.25;
  if (myApp.scale == 2.25) {
    myApp.scale = 2;
  }
  myApp.$img.trigger('transform');
});

$('.js-zoom-out').on('click', function() {
  myApp.scale -= 0.25;
  if (myApp.scale == 0) {
    myApp.scale = 0.25;
  }
  myApp.$img.trigger('transform');
});

.container {
  background: gold;
  position: relative;
}

.container img {
  position: absolute;
  top: 0;
  bottom: 250px;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 999;
}

.masked-img {
  overflow: hidden;
  position: relative;
}

.pip {
  display: inline-block;
  margin: 0;
  position: absolute;
}

.edit {
  display: block;
  background: #444;
  border: 1px solid black;
  color: white;
  text-align: center;
  cursor: pointer;
  position: absolute;
  z-index: 3;
}

.edit:hover {
  background: white;
  color: black;
  position: absolute;
  z-index: 3;
}

.dark_content {
  display: none;
  position: relative;
  top: 25%;
  left: 25%;
  width: 350px;
  height: 350px;
  padding: 16px;
  border: 16px solid orange;
  background-color: white;
  z-index: 1002;
  overflow: auto;
}
.js-zoom-out,.js-zoom-in{border: solid lime 1px;}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<input id="fileup" name="fileup" type="file" style="display:none" />
<div class="container">
</div>

<template id='demoTemplate'>
   <span>      
         <span class="btn-group">
            <button type="button" class="js-zoom-in">Zoom In</button>
            <button type="button" class="js-zoom-out">Zoom Out</button>
            <button type="button" class="js-rotate-right">Rotate Right</button>
            <button type="button" class="js-rotate-left">Rotate Left</button>
         </span>		 
		 <img class="template-image" src ="" style ="display:none">                     </span>
</template>

Answer 2

我解决了您的问题，但我听不清，如何将这个image添加到您的蒙版图像中，如果您知道如何将这个图像添加到蒙版图像中，请在评论中告诉我，我一定会帮助您

看了两天的代码，我终于知道，您无法将任何CSS属性添加到uploaded image中，因为您的JS仅更改了src的值，并且您的元素是由new Image()创建的，您没有添加img标签的任何图形界面，因此我们无法预览它，以解决我添加了一些功能的问题。

EXPLANATION

首先，我获取您的蒙版图像ID，并附加img标签，并在更改文件时反复更改src文件

const imgView = URL.createObjectURL(fileup.files[0]);

现在您已经预览了图像，并且可以在图像上应用所有CSS属性，我添加了放大和缩小功能。

$('.masked-img' + getId + ' #renderImage').css({
    transform: 'scale('+ scale +')'
});

我还添加了仅一次添加图片，第二次仅更改src值的功能

if (($(".masked-img" + newImageLoadedId + ' #renderImage').length) === 0) {
    $('.masked-img' + newImageLoadedId).append("<img id='renderImage' style='width: 300px' src=" + imgView + ">");
} else {
    $('#renderImage').attr('src', imgView);
}

您的字段： https://jsfiddle.net/y7Lq9d6v/

Answer 3

尝试使用此代码。 @PranavNutalapati帮助我解决了这个问题。

var target;
const imageUrl = "https://i.imgur.com/RzEm1WK.png";

let jsonData = {
    "layers": [{
        "x": 0,
        "height": 612,
        "layers": [{
            "x": 160,
            "src": "ax0HVTs.png",
            "y": 291,
            "height": 296,
            "width": 429,
            "name": "mask_1"
        }, {
            "x": 25,
            "src": "hEM2kEP.png",
            "height": 324,
            "width": 471,
            "y": 22,
            "name": "mask_2"
        }],
        "y": 0,
        "width": 612
    }]
};

const containerElement = $('#container');
const fileUp = $('#fileup');
let mask;

$(function () {

    // Upload image on the click mask image

    containerElement.click(function (e) {
        var res = e.target;
        target = res.id;
        if (e.target.getContext) {
            // click only inside Non Transparent part
            var pixel = e.target.getContext('2d').getImageData(e.offsetX, e.offsetY, 1, 1).data;
            if (pixel[3] === 255) {
                setTimeout(() => {
                    $('#fileup').click();
                }, 20);
            }
        }
    });

    // Fetch mask images from JSON file - IGNORE this code

    function getAllSrc(layers) {
        let arr = [];
        layers.forEach(layer => {
            if (layer.src) {
                arr.push({
                    src: layer.src,
                    x: layer.x,
                    y: layer.y,
                    height: layer.height,
                    width: layer.width,
                    name: layer.name
                });
            } else if (layer.layers) {
                let newArr = getAllSrc(layer.layers);
                if (newArr.length > 0) {
                    newArr.forEach(({
                        src,
                        x,
                        y,
                        height,
                        width,
                        name
                    }) => {
                        arr.push({
                            src,
                            x: (layer.x + x),
                            y: (layer.y + y),
                            height,
                            width,
                            name: (name)
                        });
                    });
                }
            }
        });
        return arr;
    }

    function json(data) {
        var width = 0;
        var height = 0;

        let arr = getAllSrc(data.layers);
        let layer1 = data.layers;
        width = layer1[0].width;
        height = layer1[0].height;
        let counter = 0;
        let table = [];

        // container dimensions
        containerElement.css('width', width + "px").css('height', height + "px").addClass('temp');
        //end

        for (let {
                src,
                x,
                y,
                name
            } of arr) {

            //Get Height and width of mask image [ edit button ]
            var ImagePosition = arr;
            //code end

            var mask = $(".container").mask({
                imageUrl: imageUrl,

                // Fetch Mask images
                maskImageUrl: 'http://i.imgur.com/' + src,
                // end

                onMaskImageCreate: function (img) {
                    // Mask image positions
                    img.css({
                        "position": "absolute",
                        "left": x + "px",
                        "top": y + "px"
                    });
                    // end

                },
                id: counter
            });
            // here
            table.push(mask);
            fileup.onchange = function () {

                let mask2 = table[target];
                const newImageLoadedId = mask2.loadImage(URL.createObjectURL(fileup.files[0]));
                document.getElementById('fileup').value = "";

                // Edit image - IGNORE this code

                if ($(".masked-img" + newImageLoadedId).length === 1) {
                    const span = $("<span class=\"pip pip" + newImageLoadedId + "\">" +
                        "<a onclick='document.getElementById(\"dark" + newImageLoadedId +
                        "\").style.display=\"block\";'><span class=\"edit edit" +
                        newImageLoadedId + "\" >Edit </span></a>" +
                        "</span>").insertAfter(".masked-img" + newImageLoadedId).css({
                        "left": ImagePosition[newImageLoadedId].x + (ImagePosition[
                            newImageLoadedId].width / 2) + "px",
                        "top": ImagePosition[newImageLoadedId].y + (ImagePosition[
                            newImageLoadedId].height / 2) + "px"
                    });
                    span.attr('data-id', newImageLoadedId)
                    $("<div id=\'dark" + newImageLoadedId + "\' class=\'dark_content\'>" +
                            $('#demoTemplate').html() +
                            "<a href=\"javascript:void(0)\" onclick=\"document.getElementById(\'dark" +
                            newImageLoadedId + "\').style.display=\'none\'\">Close</a>" + "</div>")
                        .appendTo(".pip" + newImageLoadedId).css({
                            "left": $('.edit' + newImageLoadedId).width() + 2 + "px",
                            "top": "0px"
                        });
                }
                // end
            };
            counter++;
        }
        return mask;
    }
    mask = json(jsonData);
}); // end of function

// Image code

(function ($) {
    window.JQmasks = [];
    $.fn.mask = function (options) {
        // This is the easiest way to have default options.
        var settings = $.extend({
            // These are the defaults.
            maskImageUrl: undefined,
            imageUrl: undefined,
            scale: 1,
            id: new Date().getUTCMilliseconds().toString(),
            x: 0, // image start position
            y: 0, // image start position
            onMaskImageCreate: function (div) {},
            rotate: 0,
        }, options);

        // Create the image properties
        settings.maskImage = new Image
        settings.image = new Image

        // set the cross-origin attributes
        settings.maskImage.setAttribute('crossOrigin', 'anonymous');
        settings.image.setAttribute('crossOrigin', 'anonymous');

        settings.maskImage.onload = function () {
            // once the mask is loaded, load the image
            container.loadImage(settings.imageUrl)
        }

        settings.image.onload = function () {
            // once the image is loaded, render to canvas
            container.drawMask()
            container.drawImage()
        }

        var container = $(this);

        let prevX = 0,
            prevY = 0,
            draggable = false,
            img,
            canvas,
            context,
            image,
            timeout,
            initImage = false,
            startX = settings.x,
            startY = settings.y,
            scale = settings.scale,
            div;

        container.mousePosition = function (event) {
            return {
                x: event.pageX || event.offsetX,
                y: event.pageY || event.offsetY
            };
        }

        container.selected = function (ev) {
            var pos = container.mousePosition(ev);
            var item = $(".masked-img canvas").filter(function () {
                var offset = $(this).offset()
                var x = pos.x - offset.left;
                var y = pos.y - offset.top;
                var d = this.getContext('2d').getImageData(x, y, 1, 1).data;
                return d[0] > 0
            });

            JQmasks.forEach(function (el) {
                var id = item.length > 0 ? $(item).attr("id") : "";
                if (el.id == id)
                    el.item.enable();
                else el.item.disable();
            });
        };

        container.enable = function () {
            draggable = true;
            $(canvas).attr("active", "true");
            div.css({
                "z-index": 2
            });
        }

        container.disable = function () {
            draggable = false;
            $(canvas).attr("active", "false");
            div.css({
                "z-index": 1
            });
        }

        container.getImagePosition = function () {
            return {
                x: settings.x,
                y: settings.y,
                scale: settings.scale
            };
        };

        container.zoom = function (delta) {
            settings.scale += delta;
            settings.scale = Math.min(2, Math.max(0, settings.scale))
            context.clearRect(0, 0, canvas.width, canvas.height);
            container.drawMask()
            container.drawImage();
        }

        container.rotate = function (rotation) {
            settings.rotate += rotation * Math.PI / 180;
            console.log('Rotation', settings.rotate);
            context.clearRect(0, 0, canvas.width, canvas.height);
            container.drawMask()
            container.drawImage();
        }

        container.drawMask = function () {
            canvas.width = settings.maskImage.width;
            canvas.height = settings.maskImage.height;
            context.save();
            context.beginPath();
            context.globalCompositeOperation = "source-over";
            // draw the masked image after scaling
            context.drawImage(settings.maskImage, 0, 0, settings.maskImage.width, settings.maskImage
                .height);
            context.restore()
        };

        container.drawImage = function () {
            const img = settings.image

            settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
            settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;

            context.globalCompositeOperation = 'source-atop';
            context.save();
            context.translate(settings.x + img.width / 2, settings.y + img.height / 2);
            context.rotate(settings.rotate);
            context.scale(settings.scale, settings.scale);
            context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2));
            let width = img.width, height = img.height;
            context.drawImage(img, settings.x, settings.y, width, height);
            context.restore();
            initImage = false;
        }

        // change the draggable image

        container.loadImage = function (imageUrl) {
            console.log("selected image, loading");
            settings.y = startY;
            settings.x = startX;
            prevX = prevY = 0;

            initImage = true;

            settings.image.src = imageUrl; // CHANGED

            // sirpepole Add this
            return settings.id;
        };

        container.onDragStart = function(evt) {
            console.log('Draw started');
            if (evt.target.getContext) {
                var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;

                $(canvas).attr("active", "true");
                container.selected(evt);
                prevX = evt.clientX;
                prevY = evt.clientY;
                var img = new Image();
                evt.originalEvent.dataTransfer.setDragImage(img, 10, 10);
                evt.originalEvent.dataTransfer.setData('text/plain', 'anything');

            }
        };

        container.onDragOver = function(evt) {
            console.log('Drag over');

            if (evt.target.getContext) {
                var pixel = evt.target.getContext('2d').getImageData(evt.offsetX, evt.offsetY, 1, 1).data;
                if (pixel[3] === 255) {
                    if (draggable && $(canvas).attr("active") === "true") {
                        var x = settings.x + evt.clientX - prevX;
                        var y = settings.y + evt.clientY - prevY;
                        if (x == settings.x && y == settings.y)
                            return; // position has not changed
                        settings.x += evt.clientX - prevX;
                        settings.y += evt.clientY - prevY;
                        prevX = evt.clientX;
                        prevY = evt.clientY;
                        clearTimeout(timeout);
                        timeout = setTimeout(function() {
                            container.drawMask();
                            container.drawImage();
                        }, 1);
                    }
                } else {
                    evt.stopPropagation();
                    return false;
                }
            }
        };

        container.loadMaskImage = function (imageUrl, from) {
            console.log('loading mask image from', imageUrl, from)
            canvas = document.createElement("canvas");
            context = canvas.getContext('2d');
            canvas.setAttribute("draggable", "true");
            canvas.setAttribute("id", settings.id);
            // settings.maskImageUrl = imageUrl;
            settings.maskImage.src = imageUrl // CHANGED

            div = $("<div/>", {
                "class": "masked-img"
            }).append(canvas);

            // div.find("canvas").on('touchstart mousedown', function(event)
            div.find("canvas").on('dragstart', function (event) {
                if (event.handled === false) return;
                event.handled = true;
                container.onDragStart(event);
            });

            div.find("canvas").on('touchend mouseup', function (event) {
                if (event.handled === false) return;
                event.handled = true;
                container.selected(event);
            });

            div.find("canvas").bind("dragover", container.onDragOver);

            container.append(div);
            if (settings.onMaskImageCreate)
                settings.onMaskImageCreate(div);

            // container.loadImage(settings.imageUrl);
            // Moved this to the settings.maskImage.onload
        };
        container.loadMaskImage(settings.maskImageUrl);
        JQmasks.push({
            item: container,
            id: settings.id
        })
        // Edit image
        div.addClass('masked-img' + settings.id);
        div.attr('data-id', settings.id);
        // ends
        return container;
    };
}(jQuery));

// Zoom

//document.getElementById("img").src = json(data);

function zoom_in(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.zoom(0.1);
}

function zoom_out(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.zoom(-0.1);
}

// Rotate

function rotate_right(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.rotate(20);
}

function rotate_left(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.rotate(-20);
}

.container {
    background: silver;
    position: relative;
}

.container img {
    position: absolute;
    top: 0;
    bottom: 250px;
    left: 0;
    right: 0;
    margin: auto;
    z-index: 999;
}

.masked-img {
    overflow: hidden;
    position: relative;
}

.pip {
    display: inline-block;
    margin: 0;
    position: absolute;
}

.edit {
    display: block;
    background: #444;
    border: 1px solid black;
    color: white;
    text-align: center;
    cursor: pointer;
    position: absolute;
    z-index: 3;
}

.edit:hover {
    background: white;
    color: black;
    position: absolute;
    z-index: 3;
}

.dark_content {
    display: none;
    position: relative;
    top: 25%;
    left: 25%;
    width: 250px;
    height: 250px;
    padding: 16px;
    border: 16px solid orange;
    background-color: white;
    z-index: 1002;
    overflow: auto;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<input id="fileup" name="fileup" type="file" style="display:none">

<div id="container" class="container"></div>

<template id='demoTemplate'>
    <span>
        <div class="btn-group">
            <button type="button" class="js-zoom-in" onclick="zoom_in(this)">Zoom In</button>
            <button type="button" class="js-zoom-out" onclick="zoom_out(this)">Zoom Out</button>
            <button type="button" class="js-rotate-right" onclick="rotate_right(this)">Rotate Right</button>
            <button type="button" class="js-rotate-left" onclick="rotate_left(this)">Rotate Left</button>
        </div>
        <img id="image" src="" style="display:none">
    </span>
</template>

说明

我添加了一个数据属性id，以区分图像的两个按钮。

然后，添加了一个处理按钮单击的功能（即zoom_in和zoom_out）。

function zoom_in(button) {
    const id = $(button).parents('.pip').attr('data-id') // to retrieve the id
    JQmasks[id].item.zoom(0.1); // to zoom the correct image
}

function zoom_out(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.zoom(-0.1);
}

现在，我们需要处理缩放功能。为此，我们需要在容器内创建一个新函数zoom。

container.zoom = function (delta) {
    settings.scale += delta; // increase / decrease the scale
    settings.scale = Math.min(2, Math.max(0, settings.scale)) // limiting the range of the scale from 0 to 2
    context.clearRect(0, 0, canvas.width, canvas.height); // clearing the whole canvas
    container.drawMask(); // drawing the bow
    container.drawImage(); // drawing the scaled image
}

我们仅更新scale属性，因此在绘制它时需要使用它。因此，在drawImage()函数

中

container.drawImage = function () {
    const img = settings.image

    settings.x = settings.x == 0 && initImage ? (canvas.width - (img.width * settings.scale)) / 2 : settings.x;
    settings.y = settings.y == 0 && initImage ? (canvas.height - (img.height * settings.scale)) / 2 : settings.y;

    context.globalCompositeOperation = 'source-atop';
    context.save();
    context.translate(settings.x + img.width / 2, settings.y + img.height / 2); // translating the canvas to center of the image
    context.scale(settings.scale, settings.scale); // scaling the canvas
    context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2)); // translating the canvas back to it's original position
    let width = img.width, height = img.height;
    context.drawImage(img, settings.x, settings.y, width, height);
    context.restore();
    initImage = false;
}

更新1-为用户添加了旋转图像的功能

说明

从处理按钮单击开始。

function rotate_right(button) {
    const id = $(button).parents('.pip').attr('data-id') // getting the id of the image
    JQmasks[id].item.rotate(20); // rotating it by 20deg
}

function rotate_left(button) {
    const id = $(button).parents('.pip').attr('data-id')
    JQmasks[id].item.rotate(-20);
}

现在，在容器内部，添加了一个新功能rotate()来处理旋转

container.rotate = function (rotation) {
    settings.rotate += rotation * Math.PI / 180; // converting degree to radians and adding it to the previous rotation angle
    console.log('Rotation', settings.rotate);
    context.clearRect(0, 0, canvas.width, canvas.height); // clearing the canvas
    container.drawMask(); // re-drawing the bow
    container.drawImage(); // re-drawing the image
}

在这里，我们仅更新rotation属性。因此，在绘制时我们需要使用它。对于drawImage()函数中的内容

context.save();
context.translate(settings.x + img.width / 2, settings.y + img.height / 2); // translating the canvas to the center of the image
context.rotate(settings.rotate); // rotating the image
context.scale(settings.scale, settings.scale); // scaling the image
context.translate(-(settings.x + img.width / 2), -(settings.y + img.height / 2)); // translating the image back to it's original position
let width = img.width, height = img.height;
context.drawImage(img, settings.x, settings.y, width, height);
context.restore();

Answer 4

Document.getElementById("img").src = json(data);

var angle = 0;
var scale = 1;
var $img = $('#image');

json或JSON数据或jsonData请先检查两次

Answer 5

var imagesize = $('img').width();

$('.zoomout').on('click', function() {
  imagesize = imagesize - 5;
  $('img').width(imagesize);
});

$('.zoomin').on('click', function() {
  imagesize = imagesize + 5;
  $('img').width(imagesize);
});

div {
  height: 150px;
  width: 150px;
  display: block;
  overflow: hidden;
  outline: 2px solid #777777;
  padding: 20px;
}

img {
  width: 150px;
}

button {
  font-size: 10px;
  margin: 10px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<div><img src="img.png" /></div>
<button class="zoomout">Zoom Out</button > <button class="zoomin">Zoom In</button >

缩放用户上传的图片onclick按钮

5 个答案:

说明

更新1-为用户添加了旋转图像的功能

说明