Specifies the height (in logical units) of the destination rectangle.
目标矩形的高度(逻辑单位)。
In the first case, the width and height of the destination rectangle are not specified, and the image is automatically scaled.
第一种情况不指定目的端矩形的宽度和高度，而是自动缩放影像。
In the second case, the width and height (measured in pixels) of the destination rectangle are specified to be the same as the width and height of the original image.
第二种情况会将目的端矩形的宽度和高度(以像素为单位)指定成与原始影像的宽度和高度相同。
In the second case, the width and height (measured in pixels) of the destination rectangle are specified to be the same as the width and height of the original image.
第二种情况会将目的端矩形的宽度和高度(以像素为单位)指定成与原始影像的宽度和高度相同。
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