回答編集履歴
3
pushMatrix()/popMatrix()を除去
test
CHANGED
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@@ -60,8 +60,6 @@
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60
60
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61
61
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// 三角形の描画に関する処理
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62
62
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63
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-
pushMatrix();
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64
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-
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translate(x+500, y+500);
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float x1 = sin(radians(120)); // 0.866;
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@@ -88,8 +86,6 @@
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triangle(x1, y1, x2, y2, x3, y3);
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90
88
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91
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-
popMatrix();
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92
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-
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}
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94
90
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95
91
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```
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2
三角形の座標をマジックナンバーではなくsin/cosで表すよう変更
test
CHANGED
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@@ -20,8 +20,6 @@
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20
20
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21
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float SCALE = 10;
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22
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23
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-
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24
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-
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void setup(){
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size(1000,1000);
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@@ -40,6 +38,8 @@
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40
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void draw() {
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42
40
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41
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+
// 円周の位置を計算（10度単位）
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42
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+
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43
43
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t += PI * 10 / 180;
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44
44
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45
45
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float x = r * sin(t);
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@@ -47,6 +47,8 @@
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47
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float y = r * cos(t);
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48
48
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49
49
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50
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+
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51
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+
// 三角形の線の太さと色を指定
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strokeWeight(0.1);
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52
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@@ -56,25 +58,33 @@
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56
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57
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60
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61
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+
// 三角形の描画に関する処理
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62
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+
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pushMatrix();
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60
64
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translate(x+500, y+500);
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62
66
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63
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-
float x1 =
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67
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+
float x1 = sin(radians(120)); // 0.866;
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64
68
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65
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-
float y1 = -0.5;
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69
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+
float y1 = cos(radians(120)); // -0.5;
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66
70
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67
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-
float x2 = 0.866;
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71
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+
float x2 = sin(radians(240)); // -0.866;
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68
72
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69
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-
float y2 = -0.5;
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73
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+
float y2 = cos(radians(240)); // -0.5;
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70
74
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71
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-
float x3 = 0.0;
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75
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+
float x3 = sin(radians(360)); // 0.0;
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72
76
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73
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-
float y3 = 1.0;
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77
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+
float y3 = cos(radians(360)); // 1.0;
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78
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+
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79
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+
// 回転
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74
80
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rotate(-t);
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83
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+
// 拡大
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84
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+
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scale(SCALE);
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86
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+
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87
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+
// 三角形の描画
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78
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triangle(x1, y1, x2, y2, x3, y3);
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80
90
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1
ソースコードを簡素化
test
CHANGED
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@@ -16,9 +16,11 @@
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16
16
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17
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float t;
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-
float
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+
float r;
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-
float
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float SCALE = 10;
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+
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void setup(){
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24
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@@ -28,7 +30,7 @@
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28
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t = 0;
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30
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31
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-
r = (550+
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33
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+
r = (550+SCALE)/2;
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32
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noStroke();
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34
36
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@@ -44,33 +46,35 @@
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44
46
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45
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float y = r * cos(t);
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46
48
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47
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-
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48
49
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50
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+
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49
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-
strokeWeight(1);
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51
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+
strokeWeight(0.1);
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50
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51
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stroke(255, 0, 0);
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52
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53
55
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noFill();
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54
56
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55
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-
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57
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+
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56
58
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57
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pushMatrix();
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58
60
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59
61
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translate(x+500, y+500);
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60
62
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61
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-
float x1 = -0.866
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63
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+
float x1 = -0.866;
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62
64
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63
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-
float y1 = -0.5
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65
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+
float y1 = -0.5;
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64
66
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65
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-
float x2 = 0.866
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67
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+
float x2 = 0.866;
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66
68
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67
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-
float y2 = -0.5
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69
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+
float y2 = -0.5;
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68
70
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69
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-
float x3 = 0.0
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71
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+
float x3 = 0.0;
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70
72
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71
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-
float y3 = 1.0
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73
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+
float y3 = 1.0;
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72
74
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73
75
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rotate(-t);
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76
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+
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77
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+
scale(SCALE);
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74
78
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75
79
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triangle(x1, y1, x2, y2, x3, y3);
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76
80
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