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並前往https://www.flutterclutter.dev/flutter/tutorials/2022-04-17-rotate-custom-paint-canvas-flutter/

How to rotate an object using CustomPaint / Canvas in Flutter

... 6); 7 8drawRotated( 9 canvas, 10 Offset( 11 object.x + (object.width / 2), 12 object.y + (object.height / 2), 13 ), 14 math.pi / 2, ...

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