回答編集履歴
2
tuiki
test
CHANGED
@@ -51,3 +51,49 @@
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51
51
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<canvas id="rectangle" width="700" height="550"></canvas>
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52
52
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53
53
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```
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54
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+
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55
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56
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57
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# 色も指定
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58
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59
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```javascript
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61
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<script>
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window.addEventListener('DOMContentLoaded', ()=>{
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document.querySelector('#btn').addEventListener('click',()=>{
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const ctx = document.getElementById('rectangle').getContext('2d');
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ctx.font = "48px serif";
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ctx.fillStyle = document.querySelector('#color').value;
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ctx.fillText(document.querySelector('#txt').value, 10, 50);
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});
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});
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79
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</script>
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81
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<input type="text" id="txt" value="Hello world">
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<select id="color">
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85
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<option value="black">黒</optioin>
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86
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87
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<option value="red">赤</optioin>
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89
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<option value="blue">青</optioin>
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90
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91
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<option value="yellow">黄色</optioin>
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92
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93
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</select>
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94
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95
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<input type="button" id="btn" value="テキスト設定"><br>
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97
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<canvas id="rectangle" width="700" height="550"></canvas>
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99
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```
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1
追記
test
CHANGED
@@ -17,3 +17,37 @@
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17
17
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</script>
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18
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19
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```
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23
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# あとからテキスト追加
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```javascript
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<script>
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window.addEventListener('DOMContentLoaded', ()=>{
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document.querySelector('#btn').addEventListener('click',()=>{
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const ctx = document.getElementById('rectangle').getContext('2d');
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ctx.font = "48px serif";
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ctx.fillStyle = 'red';
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ctx.fillText(document.querySelector('#txt').value, 10, 50);
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});
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});
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</script>
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<input type="text" id="txt" value="Hello world">
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48
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49
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<input type="button" id="btn" value="テキスト設定"><br>
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50
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51
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<canvas id="rectangle" width="700" height="550"></canvas>
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52
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53
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```
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