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並前往https://books.google.com.tw/books?id=otRqEAAAQBAJ&pg=PT340&lpg=PT340&dq=Flutter+drawArc&source=bl&ots=1BECfc_R79&sig=ACfU3U2IYbzuUOhi3RFjg8eUszhUKXcMfg&hl=zh-TW&sa=X&ved=2ahUKEwido4qN5f76AhUXrJUCHZw5ABIQ6AF6BQjzARAD

Flutter开发之旅从南到北 - Google 圖書結果

... radius : ( sqrt ( pow ( size.width , 2 ) + pow ( size.width , 2 ) ) / 2 ) , ) ; canvas.drawArc(rect, -pi / 2, pi * 2 * _animationValue, false,

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