用VC++开发的一个画笔，通过拖动鼠标左键可以实现绘画，但画笔颜色更改不了，画笔不能出现，还请高手指点。-VC++ development with a brush, can be achieved by dragging the left mouse button painting, but can not change the pen color, pen can not appear, please also master pointers.

VC程序中树型控件节点拖动的完美实现源代码-VC program, drag the tree control node in the source code to achieve the perfect

VC++代码实现旋转立方体，没有使用DirectX、OpenGL，允许你拖动滑块改变旋转角度，也能让立方体围绕某一方向旋转，虽然功能不多，但是代码极具参考价值，像这类程序很能考验编程水平。-Code VC++ rotating cube, do not use DirectX, OpenGL, allowing you to drag the slider to change the angle of rotation, also allows the cube around in one di