www.pudn.com > Movement_VC.rar > VirtualCylinder.cpp

///////////////////////////////////////////////////////////////////////////////// 
//	 
// VirtualCylinder.cpp: implementation of the CVirtualCylinder class. 
// 
//////////////////////////////////////////////////////////////////////////////// 
// 版权所有(2002) 
// Copyright(2002) 
// 编写者: 向世明 
// Author: Xiang Shiming 
 
 
#include "stdafx.h" 
#include "VirtualCylinder.h" 
 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
CVirtualCylinder::CVirtualCylinder() 
{ 
	m_byRed = 128; 
	m_byGreen = 128; 
	m_byBlue = 128; 
} 
 
CVirtualCylinder::~CVirtualCylinder() 
{} 
 
//设置虚拟圆柱的主体颜色,不要将它的主体颜色设置为纯白色,白色将是高光区域内的颜色 
void CVirtualCylinder::SetColor(BYTE byRed, BYTE byGreen, BYTE byBlue) 
{ 
	m_byRed = byRed; 
	m_byGreen = byGreen; 
	m_byBlue = byBlue; 
} 
 
//绘制 
//(x,y)-----------------左上角坐标 
//nWidth, nHeight-------宽度和高度 
void CVirtualCylinder::Draw(CDC* pDC, int x, int y , int nWidth, int nHeight) 
{ 
	if(nWidth < 1) return; 
 
	//颜色 
	float fRed = m_byRed; 
	float fGreen = m_byGreen; 
	float fBlue = m_byBlue; 
 
	//颜色增量 
	float fIncR = (2.0f * (255 - m_byRed)) / nWidth; 
	float fIncG = (2.0f * (255 - m_byGreen)) / nWidth; 
	float fIncB = (2.0f * (255 - m_byBlue)) / nWidth; 
 
	for(int i = 0; i < (nWidth / 2); i++) 
	{ 
		CPen pen(PS_SOLID, 1, RGB((BYTE)fRed, (BYTE)fGreen, (BYTE)fBlue)); 
		CPen* pOldPen = pDC->SelectObject(&pen); 
 
		pDC->MoveTo(x + i, y); 
		pDC->LineTo(x + i, y + nHeight); 
		pDC->MoveTo(x + nWidth - i - 1, y); 
		pDC->LineTo(x + nWidth - i - 1, y + nHeight); 
		 
		fRed += fIncR; 
		fGreen += fIncG; 
		fBlue += fIncB; 
 
		pDC->SelectObject(pOldPen); 
		pen.DeleteObject(); 
	} 
 
	CPen pen(PS_SOLID, 1, RGB(255, 255, 255)); 
	CPen* pOldPen = pDC->SelectObject(&pen); 
 
	pDC->MoveTo(x + i, y); 
	pDC->LineTo(x + i, y + nHeight); 
	 
	pDC->SelectObject(pOldPen); 
	pen.DeleteObject(); 
}