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我有這個腳本和標記。瀏覽器無法渲染圓形
<canvas id="myCanvas" style="width:100px; height:100px; background-color:aqua" >
</canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var centerX = canvas.width/2;
var centerY = canvas.height/2;
var radius = 10;
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>
問題是,瀏覽器描繪了一個日食而不是圓圈。爲什麼?
Thanks @apsillers。所以你的意思是畫布有不同的座標系,可以由這些座標系設置? – Jami