回答編集履歴
3
調整
test
CHANGED
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@@ -84,3 +84,34 @@
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84
84
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<canvas id="canvas" width=100 height=100></canvas>
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85
85
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<textarea id="output" rows=40 cols=40></textarea>
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86
86
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```
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87
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+
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88
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+
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89
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+
# 追加テスト
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90
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+
私の環境だと300*300の9万件やってもヒットしないですね
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91
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+
ただ、firefoxは処理がかなり重いです。chromeだと早いんですが・・・
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92
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+
```html
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93
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<canvas id="canvas" width=300 height=300></canvas>
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94
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+
<script>
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95
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const ctx = document.getElementById("canvas").getContext("2d");
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96
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+
dataText = "0,49,50,51,10,65,66,67,10,227,129,130,227,129,132,227,129,134";
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97
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+
const splText = String(dataText).split(",");
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98
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for (let i = 0; i < 300; i++) {
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99
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for (let j = 0; j < 300; j+=3) {
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100
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+
const r = splText [j%splText.length];
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101
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+
const g = splText [(j+1)%splText.length];
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102
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+
const b = splText [(j+2)%splText.length];
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103
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ctx.beginPath();
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104
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+
ctx.fillStyle = "rgb(" + Number(r) + "," + Number(g) + "," + Number(b) + ")";
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105
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ctx.fillRect(j, i, 1, 1);
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106
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ctx.stroke();
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107
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const rgb1 = [r,g,b].map(x=>Number(x).toString(16).padStart(2,'0')).join('');
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108
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+
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109
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+
ctx.beginPath();
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110
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const dataTest1 = ctx.getImageData(j, i, 1, 1);
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111
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const dataTest2 = dataTest1.data;
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112
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const rgb2 = [...dataTest2].splice(0,3).map(x=>x.toString(16).padStart(2,'0')).join('');
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113
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if(rgb1!==rgb2) console.log([i,j,rgb1,rgb2]);
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114
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}
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115
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}
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116
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</script>
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117
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+
```
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2
chousei
test
CHANGED
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@@ -45,4 +45,42 @@
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45
45
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}
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46
46
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</script>
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47
47
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```
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48
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+
# 一覧表示
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49
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+
ちょっとだけリファクタリングして一覧表示にしました
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50
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+
これでi,jがいくつのときにどう値が違うか確認してみてください
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51
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+
```html
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52
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<script>
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53
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window.addEventListener('DOMContentLoaded', ()=>{
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54
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const ctx = document.getElementById("canvas").getContext("2d");
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55
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const dataText = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18";
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56
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+
const dataArray =dataText.split(",").map(Number);
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57
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let rgb = 0;
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58
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for (let i = 0; i < 6; i++) {
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59
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rgb = 0;
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60
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+
for (let j = 0; j < 6; j++) {
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61
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output.value+=`i:${i}/j:${j}/`;
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62
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const r = dataArray [rgb];
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63
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+
const g = dataArray [rgb + 1];
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64
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const b = dataArray [rgb + 2];
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65
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ctx.beginPath();
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66
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ctx.fillStyle = `rgb(${r},${g},${b})`;
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67
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ctx.fillRect(j * 1, i * 1, 1, 1);
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68
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ctx.stroke();
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69
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+
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70
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output.value+=`${r},${g},${b}-`;
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71
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ctx.beginPath();
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72
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const dataTest1 = ctx.getImageData(j * 1, i * 1, 1, 1);
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73
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const dataTest2 = dataTest1.data;
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74
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const dataTest3 = String(dataTest2).split(",", 3);
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75
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output.value+=dataTest3+"\n";
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76
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rgb = rgb + 3;
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77
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}
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78
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output.value+="-------------------------\n";
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79
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}
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80
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});
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48
81
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82
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</script>
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83
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+
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84
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+
<canvas id="canvas" width=100 height=100></canvas>
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85
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<textarea id="output" rows=40 cols=40></textarea>
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86
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```
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1
調整
test
CHANGED
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@@ -11,3 +11,38 @@
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11
11
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for (let j = 0; j < 6; j++) {
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12
12
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```
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13
13
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14
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+
# 全文
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15
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canvasに十分なサイズを取ってみる
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16
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```html
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17
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<canvas id="canvas" width=100 height=100></canvas>
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18
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<script>
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19
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const ctx = document.getElementById("canvas").getContext("2d");
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20
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dataText = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18"
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21
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const splText = String(dataText).split(",");
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22
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let rgb = 0;
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23
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for (let i = 0; i < 6; i++) {
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24
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rgb = 0;
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25
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for (let j = 0; j < 6; j++) {
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26
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const r = splText [rgb];
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27
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const g = splText [(rgb + 1)];
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28
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const b = splText [(rgb + 2)];
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29
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ctx.beginPath();
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30
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ctx.fillStyle = "rgb(" + Number(r) + "," + Number(g) + "," + Number(b) + ")";
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31
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ctx.fillRect(j * 1, i * 1, 1, 1);
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32
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ctx.stroke();
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33
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+
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34
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//追記部分
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35
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window.alert(Number(r) + "," + Number(g) + "," + Number(b));
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36
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ctx.beginPath();
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37
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const dataTest1 = ctx.getImageData(j * 1, i * 1, 1, 1);
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38
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+
const dataTest2 = dataTest1.data;
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39
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const dataTest3 = String(dataTest2).split(",", 3);
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40
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window.alert(dataTest3);
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41
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//
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42
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+
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43
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rgb = rgb + 3;
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44
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+
}
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45
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+
}
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46
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+
</script>
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47
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+
```
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48
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+
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