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HTML canvas arcTo() 方法
tryhtml5_canvas_arcto_fill
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<!DOCTYPE html> <html> <body> <h1>HTML5 Canvas</h1> <h2>The arcTo() Method</h2> <canvas id="myCanvas" width="300" height="150" style="border:1px solid grey"></canvas> <script> const c = document.getElementById("myCanvas"); const ctx = c.getContext("2d"); // Start a path ctx.beginPath(); ctx.moveTo(20, 20); // Create a horizontal line ctx.lineTo(100, 20); // Create an arc ctx.arcTo(150, 20, 150, 70, 50); // Create a vertical line ctx.lineTo(150, 120); // Fill and draw the path ctx.fill(); </script> </body> </html>