Painting Classes▲
See also this introduction to the Qt coordinate system.
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QColorTransform: The QColorTransform class is a transformation between color spaces.
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QMarginsF: The QMarginsF class defines the four margins of a rectangle.
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QRect: The QRect class defines a rectangle in the plane using integer precision.
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QRectF: The QRectF class defines a rectangle in the plane using floating point precision.
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QRgba64: The QRgba64 struct contains a 64-bit RGB color.