js canvas api draw circle code example
Example 1: js canvas draw polygon
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#f00';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(100,50);
ctx.lineTo(50, 100);
ctx.lineTo(0, 90);
ctx.closePath();
ctx.fill();
Example 2: javascript draw circle on canvas
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.arc(x, y, radius, 0, Math.PI * 2);
ctx.fillStyle = "red";
ctx.fill();