Created
May 12, 2017 09:47
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| pushMatrix(); // 儲存修改 | |
| rotate(PI / 4); // rad = PI / 4 = 45deg （把角度換算成弧度） | |
| ellipse(width / 2, height / 2, 100, 50); // 繪製一個橢圓（在畫面中央） | |
| popMatrix(); // 套用修改 |
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