Raster image formats store the picture as a bitmap describing the state of pixels, as opposed to recording the length and locations of primitives such as lines and curves.
光栅图像格式将图片存储为描述像素状态的位图，而不是记录图元（譬如，线和曲线）的长度和位置。
Step 3: through the definition of parameters, generate the corresponding bitmap, and the Picture Control showed the bitmap, See achieve specific source.
步骤三：通过参数定义，生成对应的Bitmap，再在Picture控件中显示该位图，具体实现参看源程序。
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