红色渐变到绿色

说明

    红色RGB(255,0, 0),绿色RGB(0,255,0),黄色作为中间的过渡颜色RGB(255,255,0),因此简单的渐变运算过程如下:

    长度为d的矩形,均分两份,一份的RGB的R分量不变,G分量逐渐递增到255,另一份RGB的G分量不变,R分量逐渐递减


例子

int rColorPart = 0;

int gColorPart = 255;

int height = m_size.GetHeight();

int width  = m_size.GetWidth();

int increment = 255 / (height/2);

for (int i=0; i

{

dc.SetPen(wxPen(wxColor(rColorPart, 255, 0), 2));

dc.DrawLine(0, i, 3, i);

dc.DrawLine(width-3, i, width, i);

rColorPart = rColorPart + increment;

}

for (int i=height/2; i

{

dc.SetPen(wxPen(wxColor(255, gColorPart, 0), 2));

dc.DrawLine(0, i, 3, i);

dc.DrawLine(width-3, i, width, i);

gColorPart = gColorPart - increment;

}


    本文转自fengyuzaitu 51CTO博客,原文链接:http://blog.51cto.com/fengyuzaitu/1890614,如需转载请自行联系原作者




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