如何在此代码中更改ctx fillystyle? [英] How can I change ctx fillystyle in this code?
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问题描述
Js fiddle [ ]
如何将图像设置为此ctx?如你所见它只有颜色作为fillstyle。但我想把图像放在那里。
我该怎么办?
我尝试了什么:
var bigGreen = new BigCircle(ctx,50,50,'#5eb62b',50);
我尝试将图片网址设置为函数参数:
var bigGreen = new BigCircle(ctx,50,50,'url (myimage.png)',50);
无效。
Js fiddle[]
How can I set an image into this ctx? As you see it has only colors as fillstyle. But I would like to put image over there.
What should I do?
What I have tried:
var bigGreen = new BigCircle(ctx,50, 50, '#5eb62b', 50);
I tried put image url to function argument:
var bigGreen = new BigCircle(ctx,50, 50, 'url("myimage.png")', 50);
Not working.
推荐答案
< html>
< body>
< canvas id =canvaswidth =500height =100>
画布不支持!
< / canvas>
< / body>
< / html>
BigCircle = function(ctx,x, y,color,circleSize){
ctx.beginPath();
ctx.arc(x,y,circleSize,0,Math.PI * 2,true);
ctx.fillStyle = color
ctx.fill();
ctx.closePath();
this .clicked = function(){
ctx.fillStyle ='#ff0000'
ctx.fill();
}
};
canvas.width = 903;
canvas.height = 657;
var background = new Image();
background.src =http://i.imgur.com/yf6d9SX.jpg;
函数init(){
var canvas = document.getElementsByTagName(canvas)[0];
var ctx = canvas .getContext('2d');
var bigGreen = new BigCircle(ctx,50,50,'#5eb62b',50);
<html>
<body>
<canvas id="canvas" width="500" height="100">
Canvas not supportet!
</canvas>
</body>
</html>
BigCircle = function(ctx,x, y, color, circleSize) {
ctx.beginPath();
ctx.arc(x, y, circleSize, 0, Math.PI * 2, true);
ctx.fillStyle=color
ctx.fill();
ctx.closePath();
this.clicked=function(){
ctx.fillStyle='#ff0000'
ctx.fill();
}
};
canvas.width = 903;
canvas.height = 657;
var background = new Image();
background.src = "http://i.imgur.com/yf6d9SX.jpg";
function init() {
var canvas = document.getElementsByTagName("canvas")[0];
var ctx = canvas.getContext('2d');
var bigGreen = new BigCircle(ctx,50, 50, '#5eb62b', 50);
('#canvas')。点击(功能(e){
var x = e.clientX
,y = e.clientY
if(Math.pow(x-50,2)+ Math.pow(y-50,2)< Math.pow(50,2))
bigGreen.clicked()
ctx.drawImage(background,0,0);
})
}
('#canvas').click(function(e){
var x = e.clientX
, y = e.clientY
if(Math.pow(x-50,2)+Math.pow(y-50,2) < Math.pow(50,2))
bigGreen.clicked()
ctx.drawImage(background,0,0);
})
}
(文件).ready(function(){
init();
});
(document).ready(function() {
init();
});
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