先以opengl线框模式绘制两个（或者多个）相邻的不同颜色的三角形；然后再以其他颜色依照opengl填充模式绘制完全相同的三角形，将两次绘制结果进行混合(Blending)。-The first drawing in opengl wireframe mode two (or more) adjacent triangles of different colors　identical triangles to other colors, and then drawing in opengl fill mode, the two draw results are mixed (Blending).