In addition, you can think out of the box with this control, not just using it for gauges but using its simple graphics primitive language to build any type of image and simple animation.
But those graphics tended to be a bit ugly, because PHP's image library is primitive and doesn't support effects.
但是这些图像往往很简陋，因为php图像库非常原始，不支持特效。
3
Perceptual grouping refers to the human visual ability to extract significant image relations from lower-level primitiveimage features without any knowledge of the image content.