回答編集履歴
1
少し修正してみました
answer
CHANGED
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@@ -1,15 +1,20 @@
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-
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1
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少し修正してみました。こんな感じでしょうか？
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2
2
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3
3
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```html
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4
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<body onload="draw()">
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5
5
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<p>
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6
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左側の図形のサイズ：
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6
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縦：<input type="number"
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7
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縦：<input type="number" id="tate1" size="40" size="40" min="1" max="100" value="50">
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8
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横：<input type="number" id="yoko1" size="40" size="40" min="1" max="100" value="80">
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</p>
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<p>
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11
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右側の図形のサイズ：
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12
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縦：<input type="number" id="tate2" size="40" size="40" min="1" max="100" value="50">
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横：<input type="number"
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横：<input type="number" id="yoko2" size="40" size="40" min="1" max="100" value="80">
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</p>
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<
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15
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<p>
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<input type="button" value="更新" onclick="koushin1()">
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</p>
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<canvas id="pattern1" width="1000" height="500"></canvas>
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<script>
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@@ -21,25 +26,24 @@
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var canvas = document.getElementById('pattern1');
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if (canvas.getContext) {
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var ctx = canvas.getContext('2d');
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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25
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var yoko1 = document.
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30
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var yoko1 = document.getElementById('yoko1').value;
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26
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var tate1 = document.
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31
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var tate1 = document.getElementById('tate1').value;
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27
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var yoko2 = document.
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32
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var yoko2 = document.getElementById('yoko2').value;
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var tate2 = document.
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var tate2 = document.getElementById('tate2').value;
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ctx.strokeRect(20, 20, yoko1 * 4.5, tate1 * 4.5); // （20，20，入力値*4.5,入力*4.5）
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ctx.strokeRect(500, 20, yoko2 * 4.5, tate2 * 4.5); // 上同様
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}
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-
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}
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function koushin1() {
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draw();
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+
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}
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</script>
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40
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</body>
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```
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＜実行結果＞
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44
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[https://jsfiddle.net/cx20/
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48
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[https://jsfiddle.net/cx20/4p5q7uvg/](https://jsfiddle.net/cx20/4p5q7uvg/)
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45
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-
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