带滑块的渐变调色板VB6.0源码，拖动滑块可改变R/G/B三基色的值，从而改变演示区的颜色，右侧是显示颜色的十六进制值，本源码可研究：滑块的应用、渐变色的动态生成。-Gradient palette VB6.0 source code with the slider, drag the slider to change the R/G value/B tricolor, thus changing the color of the demo area, on the right is displ