参考坐标变换 SetWorldTransformThe SetWorldTransform function sets a two-dimensional linear transformation between world space and page space for the specified device context. This transformation can be used to scale, rotate, shear, or translate graphics output. 先使用 SetWorldTransform 然后再 Ellipse
SetWorldTransformThe SetWorldTransform function sets a two-dimensional linear transformation between world space and page space for the specified device context. This transformation can be used to scale, rotate, shear, or translate graphics output. 先使用 SetWorldTransform 然后再 Ellipse