如何计算元素旋转的变换translate（x，y）补偿？

时间：2019-01-21 11:32:28

标签： javascript css css3 css-transforms

我正在制作个人资料图片裁剪编辑器，该编辑器可以在区域内拖动，缩放和旋转图像。

图像的拖动是通过捕获区域的mousedown和mousemove事件并计算光标在区域内的x / y坐标的开始和结束以获取光标移动的距离来完成的。然后将此值添加到图像的当前内联样式变换的translate（x，y）值中（或从中减去）（取决于方向）。

var dragArea = document.getElementById('drag-area');
var photoImg = document.getElementById('photo');
var cropCircle = document.getElementById('crop-circle');
var cloneContainer = document.getElementById('clone-container');
var resetAll = document.getElementById('reset-all');
var scaleSlider = document.getElementById('scale-slider');
var scaleInput = document.getElementById('scale-input');
var scaleReset = document.getElementById('scale-reset');
var rotateSlider = document.getElementById('rotate-slider');
var rotateInput = document.getElementById('rotate-input');
var rotateReset = document.getElementById('rotate-reset');
var area = {}, photo = {
  translate: {
    x: 0, y: 0
  }, 
  transformOrigin: {
    x: 0, y: 0
  }
};

photoImg.src = photoSrc();
photoImg.style.top = cropCircle.offsetTop+'px';
photoImg.style.left = cropCircle.offsetLeft+'px';
photoImg.style.transform = 'scale(1) rotate(0deg) translate(0px, 0px)';
photoImg.style.transformOrigin = '0px 0px';
photoImg.onload = function() {
  if (this.naturalWidth < this.naturalHeight) {
    this.width = cropCircle.clientWidth;
  } else if (this.naturalWidth > this.naturalHeight) {
    this.height = cropCircle.clientHeight;
  } else {
    this.height = cropCircle.clientHeight;
    this.width = cropCircle.clientWidth;
  }
}

dragArea.onmouseenter = function() {
  this.onmousedown = function(e) {
    var transform = photoImg.style.transform;
    var photoStyle = window.getComputedStyle(photoImg);
    var photoMatrix = new DOMMatrix(photoStyle.transform);
    var transformOrigin = photoImg.style.transformOrigin.replace(/px/g, '').split(' ');
  
    photo = {
      translate: {},
      x: photoMatrix.m41,
      y: photoMatrix.m42,
      scale: Number(/scale\((-?\d+(?:\.\d*)?)\)/.exec(transform)[1]),
      rotate: Number(/rotate\((-?\d+(?:\.\d*)?)deg\)/.exec(transform)[1]),
      transformOrigin: {
        x: Number(transformOrigin[0]),
        y: Number(transformOrigin[1])
      }
    }

    area = {
      start: {
        x: e.offsetX + (e.target == cropCircle ? cropCircle.offsetLeft : 0),
        y: e.offsetY + (e.target == cropCircle ? cropCircle.offsetTop : 0)
      },
      distance: {
        x: 0,
        y: 0
      }
    };

    this.onmousemove = function(e) {
      area.end = {
        x: e.offsetX + (e.target == cropCircle ? cropCircle.offsetLeft : 0),
        y: e.offsetY + (e.target == cropCircle ? cropCircle.offsetTop : 0)
      };

      if (area.end.x > area.start.x) {
        area.distance.x = {
          type: 'positive', // right
          total: area.end.x - area.start.x
        }
      } else {
        area.distance.x = {
          type: 'negative', // left
          total: area.start.x - area.end.x
        }
      }
      if (area.end.y > area.start.y) {
        area.distance.y = {
          type: 'positive', // down
          total: area.end.y - area.start.y
        }
      } else {
        area.distance.y = {
          type: 'negative', // up
          total: area.start.y - area.end.y
        }
      }

      if (area.distance.x.type == 'positive') {
        photo.translate.x = photo.x + area.distance.x.total;
      } else {
        photo.translate.x = photo.x - area.distance.x.total;
      }
      if (area.distance.y.type == 'positive') {
        photo.translate.y = photo.y + area.distance.y.total;
      } else {
        photo.translate.y = photo.y - area.distance.y.total;
      }

      photoTransform({x: photo.translate.x, y: photo.translate.y});
    }
  }
}

dragArea.onmouseleave = function() {
  this.onmousemove = function(e) {
    e.preventDefault();
  }
}

dragArea.onmouseup = function() {
  this.onmousemove = function(e) {
    e.preventDefault();
  }
}

resetAll.onclick = function() {
  scaleSlider.value = scaleReset.value;
  scaleInput.value = scaleReset.value;
  rotateSlider.value = rotateReset.value;
  rotateInput.value = rotateReset.value;
  photo = {
    translate: {
      x: 0, y: 0
    }, 
    transformOrigin: {
      x: 0, y: 0
    }
  };
  photoTransform({scale: 1, rotate: '0', x: '0', y: '0'});
}

scaleSlider.oninput = function() {
  var value = this.value;
  scaleInput.value = value;
  photoTransform({scale: value});
}
scaleInput.oninput = function() {
  var value = this.value;
  this.value = value.length ? value : scaleReset.value;
  scaleSlider.value = this.value;
  photoTransform({scale: this.value});
}
scaleInput.onkeydown = function(e) {
  if (e.keyCode == 13) this.blur();
}
scaleInput.onblur = function() {
  var value = this.value;
  this.value = value.length ? value : scaleReset.value;
  scaleSlider.value = this.value;
  photoTransform({scale: this.value});
}
scaleReset.onclick = function() {
  scaleSlider.value = this.value;
  scaleInput.value = this.value;
  photoTransform({scale: this.value});
}

rotateSlider.oninput = function() {
  var value = this.value;
  rotateInput.value = value;
  photoTransform({rotate: value});
}
rotateInput.oninput = function() {
  var value = this.value;
  this.value = value.length ? value : rotateReset.value;
  rotateSlider.value = this.value;
  photoTransform({rotate: this.value});
}
rotateInput.onkeydown = function(e) {
  if (e.keyCode == 13) this.blur();
}
rotateInput.onblur = function() {
  var value = this.value;
  this.value = value.length ? value : rotateReset.value;
  rotateSlider.value = this.value;
  photoTransform({rotate: this.value});
}
rotateReset.onclick = function() {
  rotateSlider.value = this.value;
  rotateInput.value = this.value;
  photoTransform({rotate: this.value});
}

function photoTransform(property) {
  property = property || {};
  var transform = photoImg.style.transform;
  var axisX = property.axisX || photo.transformOrigin.x || (cropCircle.getBoundingClientRect().width / 2);
  var axisY = property.axisY || photo.transformOrigin.y || (cropCircle.getBoundingClientRect().height / 2);
  var scale = property.scale || photo.scale || Number(/scale\((-?\d+(?:\.\d*)?)\)/.exec(transform)[1]);
  var rotate = property.rotate || photo.rotate || Number(/rotate\((-?\d+(?:\.\d*)?)deg\)/.exec(transform)[1]);
  var translate = /translate\((-?\d+(?:\.\d*)?)px, (-?\d+(?:\.\d*)?)px\)/.exec(transform);
  var translateX = (property.x || photo.translate.x || Number(translate[1])) / scale;
  var translateY = (property.y || photo.translate.y || Number(translate[2])) / scale;

  photoImg.style.transformOrigin = axisX+'px '+axisY+'px';
  photoImg.style.transform = 'scale('+scale+') rotate('+rotate+'deg) translate('+translateX+'px, '+translateY+'px)';
  
  photo.transformOrigin = {
    x: axisX,
    y: axisY
  }
  photo.scale = scale;
  photo.rotate = rotate;
}

function photoSrc() {
  return 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}
body {
  background-color: #eff1f3;
}
#profile-picture {
  width: 370px;
  height: 330px;
  margin: auto;
}
#profile-picture * {
  user-select: none;
}
#drag-area {
  width: 100%;
  height: 100%;
  cursor: move;
  cursor: grab;
  display: block;
  overflow: hidden;
  position: relative;
  background-color: #000;
  background-repeat: repeat;
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAJElEQVQoU2M8e/asMQMaMDY2PosuxjgUFKI7GsTH5m7GIaAQAA4fIQ1WOLcWAAAAAElFTkSuQmCC');
}
#drag-area:active {
  cursor: grabbing;
}
#clone-container {
  width: 0px;
  height: 0px;
  display: block;
  overflow: hidden;
  position: absolute;
}
#photo, #photo-clone {
  display: block;
  min-width: 230px;
  min-height: 230px;
  position: absolute;
  pointer-events: none;
}
img[src=''] {
  visibility: hidden;
}
#crop-circle {
  width: 230px;
  height: 230px;
  margin: 50px auto;
  overflow: hidden;
  position: relative;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #fff, 0 0 0 100vw rgba(0,0,0,0.5);
}
#circle-thirds {
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: absolute;
  pointer-events: none;
  border-radius: 100%;
}
#circle-thirds * {
  z-index: 1;
  position: absolute;
  background-color: rgba(226,226,226,0.5);
}
#circle-thirds .top-horizontal {
  width: 100%;
  height: 1px;
  top: 33.33333%;
}
#circle-thirds .bottom-horizontal {
  width: 100%;
  height: 1px;
  top: 66.66666%;
}
#circle-thirds .left-vertical {
  height: 100%;
  width: 1px;
  left: 33.33333%;
}
#circle-thirds .right-vertical {
  height: 100%;
  width: 1px;
  left: 66.66666%;
}
.photo-options {
  width: 100%;
  display: block;
  position: relative;
  padding-top: 15px;
}
.option-buttons {
  width: 100%;
  display: flex;
  position: relative;
  padding-bottom: 10px;
  justify-content: space-between;
}
.option-buttons button {
  width: 100%;
}
.option-buttons button + button {
  margin-left: 10px;
}
.photo-options fieldset {
  margin: 0px;
}
.photo-options fieldset + fieldset {
  margin-top: 10px;
}
.option-slider {
  display: flex;
  position: relative;
}
.option-slider input[type=range] {
  width: 50%;
  flex-shrink: 0;
}
.option-slider input[type=number] {
  width: 20%;
  margin: 0 10px;
}
.option-slider button {
  width: 30%;
}
<div id="profile-picture">
  <div id="drag-area">
    <div id="clone-container"></div>
    <img id="photo" src="">
    <div id="crop-circle">
      <div id="circle-thirds">
        <span class="top-horizontal"></span>
        <span class="bottom-horizontal"></span>
        <span class="left-vertical"></span>
        <span class="right-vertical"></span>
      </div>
    </div>
  </div>
  <div class="photo-options">
    <div class="option-buttons">
      <button id="reset-all">Reset everything</button>
    </div>
    <fieldset>
      <legend>Scale</legend>
        <div class="option-slider">
        <input type="range" id="scale-slider" min="1" max="3" step="0.01" value="1">
        <input type="number" id="scale-input" min="1" max="3" step="0.01" value="1">
        <button id="scale-reset" value="1">Reset</button>
      </div>
    </fieldset>
    <fieldset>
      <legend>Rotate</legend>
      <div class="option-slider">
        <input type="range" id="rotate-slider" min="-180" max="180" step="1" value="0">
        <input type="number" id="rotate-input" min="-180" max="180" step="1" value="0">
        <button id="rotate-reset" value="0">Reset</button>
      </div>
    </fieldset>
  </div>
</div>

问题在于，旋转图像时，其translate（x y）值不再相对于该区域的x / y坐标。

我找到了几个示例，这些示例如何使用旋转角度，cos和sin的弧度来计算旋转的正方形或矩形的四个角的x / y坐标。但是由于几何不是我的强项，所以我不知道这些计算将如何应用于图像的translate（x，y）值。

这是图像裁剪器当前工作方式的笔：https://codepen.io/ClubAce/pen/maNJNZ

无论旋转方向如何，图像都应沿区域的x / y轴拖动。

我真的希望有人能帮助我弄清楚如何修改脚本以产生所需的拖动行为。

谢谢。

2 个答案:

答案 0 :(得分：3)

您只需要更改以下顺序：

 photoImg.style.transform = 'scale('+scale+') rotate('+rotate+'deg)  translate('+translateX+'px, '+translateY+'px) ';

对此

photoImg.style.transform = 'scale('+scale+') translate('+translateX+'px, '+translateY+'px) rotate('+rotate+'deg) ';

Order is very important when using Transform

完整代码：

var dragArea = document.getElementById('drag-area');
var photoImg = document.getElementById('photo');
var cropCircle = document.getElementById('crop-circle');
var cloneContainer = document.getElementById('clone-container');
var resetAll = document.getElementById('reset-all');
var scaleSlider = document.getElementById('scale-slider');
var scaleInput = document.getElementById('scale-input');
var scaleReset = document.getElementById('scale-reset');
var rotateSlider = document.getElementById('rotate-slider');
var rotateInput = document.getElementById('rotate-input');
var rotateReset = document.getElementById('rotate-reset');
var area = {}, photo = {
  translate: {
    x: 0, y: 0
  }, 
  transformOrigin: {
    x: 0, y: 0
  }
};

photoImg.src = photoSrc();
photoImg.style.top = cropCircle.offsetTop+'px';
photoImg.style.left = cropCircle.offsetLeft+'px';
photoImg.style.transform = 'scale(1) rotate(0deg) translate(0px, 0px)';
photoImg.style.transformOrigin = '0px 0px';
photoImg.onload = function() {
  if (this.naturalWidth < this.naturalHeight) {
    this.width = cropCircle.clientWidth;
  } else if (this.naturalWidth > this.naturalHeight) {
    this.height = cropCircle.clientHeight;
  } else {
    this.height = cropCircle.clientHeight;
    this.width = cropCircle.clientWidth;
  }
}

dragArea.onmouseenter = function() {
  this.onmousedown = function(e) {
    var transform = photoImg.style.transform;
    var photoStyle = window.getComputedStyle(photoImg);
    var photoMatrix = new DOMMatrix(photoStyle.transform);
    var transformOrigin = photoImg.style.transformOrigin.replace(/px/g, '').split(' ');
  
    photo = {
      translate: {},
      x: photoMatrix.m41,
      y: photoMatrix.m42,
      scale: Number(/scale\((-?\d+(?:\.\d*)?)\)/.exec(transform)[1]),
      rotate: Number(/rotate\((-?\d+(?:\.\d*)?)deg\)/.exec(transform)[1]),
      transformOrigin: {
        x: Number(transformOrigin[0]),
        y: Number(transformOrigin[1])
      }
    }

    area = {
      start: {
        x: e.offsetX + (e.target == cropCircle ? cropCircle.offsetLeft : 0),
        y: e.offsetY + (e.target == cropCircle ? cropCircle.offsetTop : 0)
      },
      distance: {
        x: 0,
        y: 0
      }
    };

    this.onmousemove = function(e) {
      area.end = {
        x: e.offsetX + (e.target == cropCircle ? cropCircle.offsetLeft : 0),
        y: e.offsetY + (e.target == cropCircle ? cropCircle.offsetTop : 0)
      };

      if (area.end.x > area.start.x) {
        area.distance.x = {
          type: 'positive', // right
          total: area.end.x - area.start.x
        }
      } else {
        area.distance.x = {
          type: 'negative', // left
          total: area.start.x - area.end.x
        }
      }
      if (area.end.y > area.start.y) {
        area.distance.y = {
          type: 'positive', // down
          total: area.end.y - area.start.y
        }
      } else {
        area.distance.y = {
          type: 'negative', // up
          total: area.start.y - area.end.y
        }
      }

      if (area.distance.x.type == 'positive') {
        photo.translate.x = photo.x + area.distance.x.total;
      } else {
        photo.translate.x = photo.x - area.distance.x.total;
      }
      if (area.distance.y.type == 'positive') {
        photo.translate.y = photo.y + area.distance.y.total;
      } else {
        photo.translate.y = photo.y - area.distance.y.total;
      }

      photoTransform({x: photo.translate.x, y: photo.translate.y});
    }
  }
}

dragArea.onmouseleave = function() {
  this.onmousemove = function(e) {
    e.preventDefault();
  }
}

dragArea.onmouseup = function() {
  this.onmousemove = function(e) {
    e.preventDefault();
  }
}

resetAll.onclick = function() {
  scaleSlider.value = scaleReset.value;
  scaleInput.value = scaleReset.value;
  rotateSlider.value = rotateReset.value;
  rotateInput.value = rotateReset.value;
  photo = {
    translate: {
      x: 0, y: 0
    }, 
    transformOrigin: {
      x: 0, y: 0
    }
  };
  photoTransform({scale: 1, rotate: '0', x: '0', y: '0'});
}

scaleSlider.oninput = function() {
  var value = this.value;
  scaleInput.value = value;
  photoTransform({scale: value});
}
scaleInput.oninput = function() {
  var value = this.value;
  this.value = value.length ? value : scaleReset.value;
  scaleSlider.value = this.value;
  photoTransform({scale: this.value});
}
scaleInput.onkeydown = function(e) {
  if (e.keyCode == 13) this.blur();
}
scaleInput.onblur = function() {
  var value = this.value;
  this.value = value.length ? value : scaleReset.value;
  scaleSlider.value = this.value;
  photoTransform({scale: this.value});
}
scaleReset.onclick = function() {
  scaleSlider.value = this.value;
  scaleInput.value = this.value;
  photoTransform({scale: this.value});
}

rotateSlider.oninput = function() {
  var value = this.value;
  rotateInput.value = value;
  photoTransform({rotate: value});
}
rotateInput.oninput = function() {
  var value = this.value;
  this.value = value.length ? value : rotateReset.value;
  rotateSlider.value = this.value;
  photoTransform({rotate: this.value});
}
rotateInput.onkeydown = function(e) {
  if (e.keyCode == 13) this.blur();
}
rotateInput.onblur = function() {
  var value = this.value;
  this.value = value.length ? value : rotateReset.value;
  rotateSlider.value = this.value;
  photoTransform({rotate: this.value});
}
rotateReset.onclick = function() {
  rotateSlider.value = this.value;
  rotateInput.value = this.value;
  photoTransform({rotate: this.value});
}

function photoTransform(property) {
  property = property || {};
  var transform = photoImg.style.transform;
  var axisX = property.axisX || photo.transformOrigin.x || (cropCircle.getBoundingClientRect().width / 2);
  var axisY = property.axisY || photo.transformOrigin.y || (cropCircle.getBoundingClientRect().height / 2);
  var scale = property.scale || photo.scale || Number(/scale\((-?\d+(?:\.\d*)?)\)/.exec(transform)[1]);
  var rotate = property.rotate || photo.rotate || Number(/rotate\((-?\d+(?:\.\d*)?)deg\)/.exec(transform)[1]);
  var translate = /translate\((-?\d+(?:\.\d*)?)px, (-?\d+(?:\.\d*)?)px\)/.exec(transform);
  var translateX = (property.x || photo.translate.x || Number(translate[1])) / scale;
  var translateY = (property.y || photo.translate.y || Number(translate[2])) / scale;

  photoImg.style.transformOrigin = axisX+'px '+axisY+'px';
  photoImg.style.transform = 'scale('+scale+') translate('+translateX+'px, '+translateY+'px) rotate('+rotate+'deg) ';
  
  photo.transformOrigin = {
    x: axisX,
    y: axisY
  }
  photo.scale = scale;
  photo.rotate = rotate;
}

function photoSrc() {
  return 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}
body {
  background-color: #eff1f3;
}
#profile-picture {
  width: 370px;
  height: 330px;
  margin: auto;
}
#profile-picture * {
  user-select: none;
}
#drag-area {
  width: 100%;
  height: 100%;
  cursor: move;
  cursor: grab;
  display: block;
  overflow: hidden;
  position: relative;
  background-color: #000;
  background-repeat: repeat;
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAJElEQVQoU2M8e/asMQMaMDY2PosuxjgUFKI7GsTH5m7GIaAQAA4fIQ1WOLcWAAAAAElFTkSuQmCC');
}
#drag-area:active {
  cursor: grabbing;
}
#clone-container {
  width: 0px;
  height: 0px;
  display: block;
  overflow: hidden;
  position: absolute;
}
#photo, #photo-clone {
  display: block;
  min-width: 230px;
  min-height: 230px;
  position: absolute;
  pointer-events: none;
}
img[src=''] {
  visibility: hidden;
}
#crop-circle {
  width: 230px;
  height: 230px;
  margin: 50px auto;
  overflow: hidden;
  position: relative;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #fff, 0 0 0 100vw rgba(0,0,0,0.5);
}
#circle-thirds {
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: absolute;
  pointer-events: none;
  border-radius: 100%;
}
#circle-thirds * {
  z-index: 1;
  position: absolute;
  background-color: rgba(226,226,226,0.5);
}
#circle-thirds .top-horizontal {
  width: 100%;
  height: 1px;
  top: 33.33333%;
}
#circle-thirds .bottom-horizontal {
  width: 100%;
  height: 1px;
  top: 66.66666%;
}
#circle-thirds .left-vertical {
  height: 100%;
  width: 1px;
  left: 33.33333%;
}
#circle-thirds .right-vertical {
  height: 100%;
  width: 1px;
  left: 66.66666%;
}
.photo-options {
  width: 100%;
  display: block;
  position: relative;
  padding-top: 15px;
}
.option-buttons {
  width: 100%;
  display: flex;
  position: relative;
  padding-bottom: 10px;
  justify-content: space-between;
}
.option-buttons button {
  width: 100%;
}
.option-buttons button + button {
  margin-left: 10px;
}
.photo-options fieldset {
  margin: 0px;
}
.photo-options fieldset + fieldset {
  margin-top: 10px;
}
.option-slider {
  display: flex;
  position: relative;
}
.option-slider input[type=range] {
  width: 50%;
  flex-shrink: 0;
}
.option-slider input[type=number] {
  width: 20%;
  margin: 0 10px;
}
.option-slider button {
  width: 30%;
}
<div id="profile-picture">
  <div id="drag-area">
    <div id="clone-container"></div>
    <img id="photo" src="">
    <div id="crop-circle">
      <div id="circle-thirds">
        <span class="top-horizontal"></span>
        <span class="bottom-horizontal"></span>
        <span class="left-vertical"></span>
        <span class="right-vertical"></span>
      </div>
    </div>
  </div>
  <div class="photo-options">
    <div class="option-buttons">
      <button id="reset-all">Reset everything</button>
    </div>
    <fieldset>
      <legend>Scale</legend>
        <div class="option-slider">
        <input type="range" id="scale-slider" min="1" max="3" step="0.01" value="1">
        <input type="number" id="scale-input" min="1" max="3" step="0.01" value="1">
        <button id="scale-reset" value="1">Reset</button>
      </div>
    </fieldset>
    <fieldset>
      <legend>Rotate</legend>
      <div class="option-slider">
        <input type="range" id="rotate-slider" min="-180" max="180" step="1" value="0">
        <input type="number" id="rotate-input" min="-180" max="180" step="1" value="0">
        <button id="rotate-reset" value="0">Reset</button>
      </div>
    </fieldset>
  </div>
</div>

答案 1 :(得分：1)

您必须将旋转应用于平移，这听起来很复杂，而且如果您不熟悉几何，也许是这样。但基本上，我们将平移视为同一坐标系中的单个点，然后对其应用旋转。 

function transformTranslateX(translateX, translateY, rotationDegrees) {
    rotationRadians = rotationDegrees * Math.PI / 180;
    return translateX * Math.cos(rotationRadians) - translateY * Math.sin(rotationRadians);
}

function transformTranslateY(translateX, translateY, rotationDegrees) {
    rotationRadians = rotationDegrees * Math.PI / 180;
    return translateX * Math.sin(rotationRadians) + translateY * Math.cos(rotationRadians);
}

我尚未测试此代码，因此可能存在错误。

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