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Canvas にカエル(図形)を描画し、矢印キーで移動
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<!DOCTYPE html> | |
<html lang="ja"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>canvas</title> | |
<style> | |
@import url(http://fonts.googleapis.com/earlyaccess/notosansjapanese.css); | |
html, body{ | |
width: 100%; | |
height: 100%; | |
font-size: 20px; | |
font-family: 'Noto Sans Japanese', sans-serif; | |
text-align: center; | |
background-color: #fafafa; | |
} | |
#canvas1 { | |
border: 1px solid #333; | |
} | |
</style> | |
</head> | |
<body> | |
<h1>キーボード入力 + Canvas描画テスト</h1> | |
<p>矢印キー: ↑ → ↓ ←</p> | |
<p id="message">キー値:</p> | |
<canvas id="canvas1" width="200" height="200"> | |
Canvas 対応のブラウザを使用して下さい。 | |
</canvas> | |
<script> | |
(function(){ | |
var canvas1 = document.getElementById("canvas1"); | |
var ctx = canvas1.getContext("2d"); | |
var x = 0; var MAX_X = 200; | |
var y = 0; var MAX_Y = 200; | |
//キー入力 | |
document.onkeydown = keydown; | |
drawCaeru(x, y); | |
/* 参考リンク: http://www.ipentec.com/document/document.aspx?page=javascript-accept-keydown */ | |
function keydown(e){ | |
//キー入力した際のデフォルト無効 | |
e.preventDefault(); | |
var target = document.getElementById("message"); | |
target.innerHTML = "キーが押されました KeyCode :" + e.keyCode; | |
// ← | |
if(e.keyCode===37){ | |
if(x > -MAX_X/2 ){ | |
x -= 1; | |
drawCaeru(x, y); | |
} | |
}else if(e.keyCode===38){ | |
// ↑ | |
if(y > -MAX_Y/2){ | |
y -= 1; | |
drawCaeru(x, y); | |
} | |
}else if(e.keyCode===39){ | |
// → | |
if(x < MAX_X/2){ | |
x += 1; | |
drawCaeru(x, y); | |
} | |
}else if(e.keyCode===40){ | |
// ↓ | |
if(y < MAX_Y/2){ | |
y += 1; | |
drawCaeru(x, y); | |
} | |
} | |
} | |
//カエルの描画 | |
function drawCaeru(x, y){ | |
ctx.clearRect(0, 0, MAX_X, MAX_Y); | |
ctx.save(); | |
ctx.translate(x, y); | |
caeru(); | |
ctx.restore(); | |
} | |
function caeru(){ | |
//顔 | |
ctx.beginPath(); | |
ctx.scale(2, 1); | |
ctx.arc(50, 100, 30, 0, 2 * Math.PI, false); | |
ctx.closePath(); | |
ctx.fillStyle = "#3e3"; | |
ctx.fill(); | |
ctx.scale(0.5, 1); | |
//左目 | |
ctx.beginPath(); | |
ctx.arc(70, 60, 20, 0, 2 * Math.PI, false); | |
ctx.closePath(); | |
ctx.fillStyle = "white"; | |
ctx.fill(); | |
ctx.strokeStyle = "#333"; | |
ctx.lineWidth = 4; | |
ctx.stroke(); | |
ctx.fillStyle = "#fafafa"; | |
ctx.fill(); | |
//右目 | |
ctx.beginPath(); | |
ctx.arc(130, 60, 20, 0, 2 * Math.PI, false); | |
ctx.stroke(); | |
ctx.fill(); | |
//左目瞳 | |
ctx.beginPath(); | |
ctx.arc(70, 60, 5, 0, 2 * Math.PI, false); | |
ctx.closePath(); | |
ctx.fillStyle = "#333"; | |
ctx.fill(); | |
//右目瞳 | |
ctx.beginPath(); | |
ctx.arc(130, 60, 5, 0, 2 * Math.PI, false); | |
ctx.fill(); | |
//口 | |
ctx.beginPath(); | |
ctx.lineWidth = 2; | |
ctx.moveTo(50, 100); | |
/* http://www.html5.jp/canvas/ref/method/bezierCurveTo.html */ | |
ctx.bezierCurveTo(70, 120, 120, 120, 150, 100); | |
ctx.stroke(); | |
} | |
})(); | |
</script> | |
</body> | |
</html> |
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