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有没有办法在画布路径上平铺背景图像?

excanvas canvas drawing dom javascript

Igor Zinov'yev · 技术社区 · 15 年前

例如,我在一个页面中有一个画布,上面有某种路径。它是由javascript创建的,方法如下:

var context = $('#some_canvas').getContext('2d');
context.beginPath();
context.lineWidth = 5;
context.strokeStyle = '#000000';
context.moveTo(0, 0);
context.lineTo(100, 100);
context.stroke();

有没有办法让这个命令后面出现的路径有一些平铺的背景图像?

1 回复 | 直到 15 年前

IonuÈ G. Stan 15 年前

我相信你在找 createPattern() 方法:

var pattern = new Image;
pattern.src = "data:image/png;base64,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";
pattern.onload = function () {
    var context = $('#some_canvas').getContext('2d');
    context.beginPath();
    context.lineWidth = 16;
    context.strokeStyle = context.createPattern(pattern, 'repeat');
    context.moveTo(0, 0);
    context.lineTo(150, 150);
    context.stroke();
};

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