我想在另一个圆圈内绘制一个圆圈,然后在新的(小)圆圈内添加文字(例如字母表)。
到目前为止,我得到了以下内容,有什么建议吗?
<!DOCTYPE html>
<html>
<body>
<canvas id="myCanvas" width="200" height="100" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95,50,40,0,2*Math.PI);
ctx.stroke();
ctx.fillStyle ="red";
ctx.fill();
var dd = document.getElementById("myCanvas");
var ddtx = dd.getContext("2d");
ddtx.beginPath();
ddtx.arc (96,50,35,2*Math.PI,1.99*Math.PI);
ddtx.stroke();
ddtx.fillStyle ="blue";
ddtx.fill();
var d = document.getElementById("myCanvas");
var dtx = d.getContext("2d");
dtx.beginPath();
dtx.arc(95,50,10,2*Math.PI,1.9*Math.PI);
dtx.stroke();
dtx.fillStyle = "white";
dtx.fill();
</script>
</body>
</html>
答案 0 :(得分:1)
您可以按如下方式使用上下文文本功能:
new_anno =("""do something with i""" for i in anno if #some condition)
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95,50,40,0,2*Math.PI);
ctx.stroke();
ctx.fillStyle ="red";
ctx.fill();
var d = document.getElementById("myCanvas");
var dtx = d.getContext("2d");
dtx.beginPath();
dtx.arc(95,50,10,2*Math.PI,1.9*Math.PI);
dtx.stroke();
dtx.fillStyle = "white";
dtx.fill();
dtx.fillStyle = "black"; // font color to write the text with
var font = "bold 13px serif";
dtx.font = font; // specify the font
dtx.textBaseline = "top"; // set the baseline as top
dtx.fillText("A", 90 ,43); // render the text with its x and y coordinates