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有人可以帮助我一点与那个画布,我正在学习它,不能设法做一个圆圈,当r来到100它回到0动画。所以它的某种缩放图像。圆形动画
我得出这样一个循环:
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var centerX = canvas.width/2;
var centerY = canvas.height/2;
var radius = 70;
context.beginPath();
context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
context.fillStyle = 'green';
context.fill();
context.lineWidth = 5;
context.strokeStyle = '#003300';
context.stroke();
</script>
现在怎么现在我可以用帆布当半径达到100它会立即返回0 thath这个动画,然后再次进入100
感谢