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アスペクト比の計算方法

Posted at

ディスプレイ幅:1024
ディスプレイ高:720
画像幅:960
画像高:540

幅比率=ディスプレイ幅 / 画像幅
高比率=ディスプレイ高 / 画像高
比率=min(幅比率,高比率)

比率適用後の画像幅 = 画像幅 * 比率
比率適用後の画像高さ = 画像高 * 比率

1024 x 720
960x 540

x = 1024 / 960 = 1.066666666666667
y = 720 / 540 = 1.333333333333333

min(x, y) = 1.066666666666667

960 * 1.066666666666667
540 + 1.066666666666667

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