回答編集履歴
1
始点が別にあることを見落としていたので修正
test
CHANGED
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@@ -12,6 +12,8 @@
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12
12
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13
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int x2 = 200, y2 = 200;
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14
14
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15
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+
int x3 = 150, y3 = 150;
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16
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+
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int addTheta = 60;
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double length = Math.hypot(x2 - x1, y2 - y1);
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@@ -20,11 +22,11 @@
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22
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theta += Math.toRadians(addTheta);
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23
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-
int x
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25
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+
int x4 = (int)(length * Math.cos(theta) + x3);
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25
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-
int y
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+
int y4 = (int)(length * Math.sin(theta) + y3);
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27
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-
g.drawLine(x
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29
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+
g.drawLine(x3, y3, x4, y4);
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```
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@@ -38,15 +40,17 @@
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int x2 = 200, y2 = 200;
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+
int x3 = 150, y3 = 150;
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+
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int addTheta = 60;
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42
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double rad = Math.toRadians(addTheta);
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-
int x
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49
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+
int x4 = (int)((x2 - x1) * Math.cos(rad) - (y2 - y1) * Math.sin(rad) + x3);
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46
50
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-
int y
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51
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+
int y4 = (int)((x2 - x1) * Math.sin(rad) + (y2 - y1) * Math.cos(rad) + y3);
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48
52
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49
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-
g.drawLine(x
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53
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+
g.drawLine(x3, y3, x4, y4);
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50
54
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51
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```
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52
56
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