Question

我之前曾问过如何使用html5画布填充棋盘效果的形状。 HTML5 Canvas Fill with two colours

我得到了一个jsfiddle来展示如何做到这一点。 http://jsfiddle.net/NdUcv/2/

var can = document.getElementById('canvas1');
var ctx = can.getContext('2d');

// set up a pattern, something really elaborate!
var pattern = document.createElement('canvas');
pattern.width = 40;
pattern.height = 40;
var pctx = pattern.getContext('2d');

pctx.fillStyle = "rgb(188, 222, 178)";
pctx.fillRect(0,0,20,20);
pctx.fillRect(20,20,20,20);

// Now we draw that pattern to a custom shape:

var pattern = ctx.createPattern(pattern, "repeat");
ctx.beginPath();
ctx.moveTo(30, 30);
ctx.lineTo(300, 30);
ctx.lineTo(400, 60);
ctx.lineTo(300, 150);
ctx.lineTo(200, 50);
ctx.lineTo(100, 450);
//ctx.closePath();
ctx.fillStyle = pattern;
ctx.fill();

我想知道如何将此语法转换为KineticJS？我从kineticjs文档和示例中注意到，您可以填充图像或渐变，但没有提到填充图案。

如果可以使用html5本地完成，可以这样做吗？

Answer 1

是的，你可以使用类似的代码来创建一个充满你的模式的动态多边形

enter image description here

使用您的模式填充画布，就像在原生html画布中一样：

    // use a temp canvas to create a pattern
    var pattern = document.createElement('canvas');
    pattern.width = 40;
    pattern.height = 40;
    var pctx = pattern.getContext('2d');
    pctx.fillStyle = "rgb(188, 222, 178)";
    pctx.fillRect(0,0,20,20);
    pctx.fillRect(20,20,20,20);

现在使用该临时画布创建图像对象

    var img=new Image();
    img.onload=function(){
            // img now contains your pattern
    }
    img.src=pattern.toDataURL();

最后，使用fillPatternImage用您的模式填充动态多边形：

        // make a kinetic polygon filled with the pattern
        var polyPattern = new Kinetic.Polygon({
          points: [30,30, 300,30, 400,60, 300,150, 200,50, 100,450],
          fillPatternImage: img,
          stroke: 'black',
          strokeWidth: 3
        });

这是代码和小提琴：http://jsfiddle.net/m1erickson/uW8xz/

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Prototype</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.7.0.min.js"></script>

<style>
#container{
  border:solid 1px #ccc;
  margin-top: 10px;
  width:400px;
  height:400px;
}
</style>        
<script>
$(function(){

    var stage = new Kinetic.Stage({
        container: 'container',
        width: 450,
        height: 450
    });
    var layer = new Kinetic.Layer();
    stage.add(layer);

    // use a temp canvas to create a pattern
    var pattern = document.createElement('canvas');
    pattern.width = 40;
    pattern.height = 40;
    var pctx = pattern.getContext('2d');
    pctx.fillStyle = "rgb(188, 222, 178)";
    pctx.fillRect(0,0,20,20);
    pctx.fillRect(20,20,20,20);

    // make an image from the temp canvas pattern
    var img=new Image();
    img.onload=function(){

        // make a kinetic polygon filled with the pattern
        var polyPattern = new Kinetic.Polygon({
          points: [30,30, 300,30, 400,60, 300,150, 200,50, 100,450],
          fillPatternImage: img,
          stroke: 'black',
          strokeWidth: 3
        });
        // add the shape to the layer and layer.draw()
        layer.add(polyPattern);
        layer.draw();

    }
    img.src=pattern.toDataURL();


}); // end $(function(){});

</script>       
</head>

<body>
    <div id="container"></div>
</body>
</html>

KineticJS填充图案

1 个答案: