设计IHS颜色空间的一个锥体，使得连续色调色板编码方案实现简单方便。
A cone in IHS colour space is designed which makes the continuous palette coding scheme be easy to perform.
实现绘制直线、圆、矩形及任意涂鸦功能，画笔、橡皮大小可变，支持调色板。
Draw a straight line realize, round, rectangular and arbitrary graffiti function, brushes, rubber size variable, support for color palettes.
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