Vc实现View中图片的左右上下移动.doc

目的: 本文的目的是建立一个图片，在View中点击鼠标左键时，图片的位置随着点击的位置进行移动。 二：步骤： 1、建立单文档，并在view中定义成员变量 Crect m_rc； 2、在View中写OnLButttonDown事件： void CCBitmapTestView::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: 在此添加消息处理程序代码和/或调用默认值 CRect rc; GetClientRect(rc); CPoint centerPoint; centerPoint = rc.CenterPoint(); if(point.xcenterPoint.x point.y centerPoint.y) { m_rc.left += centerPoint.x - point.x; m_rc.right += centerPoint.x - point.x; m_rc.top += centerPoint.y - point.y; m_rc.bottom += centerPoint.y - point.y; } else if (point.x centerPoint.x point.y centerPoint.y) { m_rc.left += centerPoint.x - point.x; m_rc.right += centerPoint.x - point.x; m_rc.top -= point.y - centerPoint.y; m_rc.bottom -= point.y - centerPoint.y; } else if (point.x centerPoint.x point.y centerPoint.y) { m_rc.left -= point.x - centerPoint.x; m_rc.right -= point.x - centerPoint.x; m_rc.top += centerPoint.y - point.y; m_rc.bottom += centerPoint.y - point.y; } else if (point.x centerPoint.x point.y centerPoint.y) { m_rc.left -= point.x - centerPoint.x; m_rc.right -= point.x - centerPoint.x; m_rc.top -= point.y -centerPoint.y; m_rc.bottom -= point.y - centerPoint.y; } Invalidate(); CView::OnLButtonDown(nFlags, point); } 3、在view中写OnPaint事件。 void CCBitmapTestView::OnPaint() { if(!flag) { GetClientRect(m_rc); flag = true; } CPaintDC pDC(this); // device context for painting // TODO: 在此处添加消息处理程序代码 // 不为绘图消息调用CView::OnPaint() CRect rc; GetClientRect(rc); WORD a,b,c,d,e,f,g,h; a = 0x0a; b = 0x0b; c = 0x0c; d = 0x0d; e = 0x0e; f = 0x0f; g = 0x00; h = 0x01; WORD HatchBits[2*2] = { a, b, c, d }; CBitmap bm; CBrush brush,