Created
March 31, 2020 15:38
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| <!DOCTYPE html> | |
| <html lang="ko"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="750" height="750" style="border:1px solid lightgrey;"></canvas> | |
| <script> | |
| // Declare as variable | |
| var canvas = document.getElementById('canvas'); | |
| var context = canvas.getContext('2d'); | |
| var width = canvas.width; | |
| var height = canvas.height; | |
| var radius; | |
| // Listen to the onLoad event | |
| window.onload = init; | |
| function init() | |
| { | |
| context.lineWidth = 0.005; | |
| context.strokeStyle = 'black'; | |
| radius = 0.9 * Math.min(width, height) / 2; | |
| window.requestAnimationFrame(gameLoop); | |
| } | |
| function gameLoop(timeStamp) | |
| { | |
| update(); | |
| draw(); | |
| window.requestAnimationFrame(gameLoop); | |
| } | |
| // Declare as variable(for circle draw) | |
| var angle1; | |
| var xpos1; | |
| var ypos1; | |
| var angle2; | |
| var xpos2; | |
| var ypos2; | |
| function update() | |
| { | |
| // find a random point on a circle | |
| angle1 = Math.random() * 2 * Math.PI; | |
| xpos1 = (width / 2) + (radius * Math.cos(angle1)); | |
| ypos1 = (height / 2) + (radius * Math.sin(angle1)); | |
| // find another random point on the circle | |
| angle2 = Math.random() * 2 * Math.PI; | |
| xpos2 = (width / 2) + (radius * Math.cos(angle2)); | |
| ypos2 = (height / 2) + (radius * Math.sin(angle2)); | |
| } | |
| function draw() | |
| { | |
| context.moveTo(xpos1, ypos1); | |
| context.lineTo(xpos2, ypos2); | |
| context.stroke(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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