【VC开源代码栏目提醒】:网学会员鉴于大家对VC开源代码十分关注,论文会员在此为大家搜集整理了“CREATECIRCLE.CPP”一文,供大家参考学习
#include "stdafx.h"
#include "math.h"
#include "VCad.h"
#include "VCadDoc.h"
#include "VCadView.h"
#include "MainFrm.h"
#include "Entity.h"
#include "Command.h"
#include "CreateCmd.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
CCreateCircle::CCreateCircle()
: m_center(0,0), m_pos(0,0)
{
m_nStep = 0; // 初始化操作步为 0
}
CCreateCircle::~CCreateCircle()
{
}
int CCreateCircle::GetType()
{
return ctCreateCircle;
}
int CCreateCircle::OnLButtonDown(UINT nFlags, const Position& pos)
{
m_nStep ++; // 每次单击鼠标左键时操作步加 1
switch(m_nStep) // 根据操作步执行相应的操作
{
case 1:
{
m_center = m_pos = pos;
::Prompt("请输入圆周上的任意点:");
break;
}
case 2:
{
CDC* pDC = g_pView->GetDC(); // 得到设备环境指针
// 擦除在拖动状态时显示的橡皮线
CLine* pTempLine = new CLine(m_center, m_pos);
CCircle* pTempCircle = new CCircle(m_center,m_pos);
pTempLine->Draw(pDC, dmDrag);
pTempCircle->Draw(pDC, dmDrag);
delete pTempLine;
delete pTempCircle;
m_pos = pos;
CCircle* pNewCircle = new CCircle(m_center,m_pos);
pNewCircle->Draw(pDC,dmNormal);
g_pDoc->m_EntityList.AddTail(pNewCircle);
g_pDoc->SetModifiedFlag(TRUE);// set modified flag ;
g_pView->ReleaseDC(pDC); // 释放设备环境指针
m_nStep = 0; // 将操作步重置为 0
::Prompt("请输入圆的中心点:") ;
break;
}
}
return 0;
}
int CCreateCircle::OnMouseMove(UINT nFlags, const Position& pos)
{
::SetCursor(AfxGetApp()->LoadCursor(IDC_DRAW_CIRCLE));
// 用一静态变量nPreRefresh记录进入OnMouseMove状态时的刷新次数
static int nPreRefresh = g_nRefresh;
// 布尔变量bRefresh说明在OnMouseMove过程中视窗是否被刷新
BOOL bRefresh = FALSE;
// nCurRefresh用于记录当前的刷新次数
int nCurRefresh = g_nRefresh;
// 如果nCurRefresh和nPreRefresh不相等,说明视窗曾被刷新过
if(nCurRefresh != nPreRefresh){
bRefresh = TRUE;
nPreRefresh = nCurRefresh;
}
switch(m_nStep)
{
case 0:
::Prompt("请输入圆的中心点:") ;
break;
case 1:
{
Position prePos, curPos;
prePos = m_pos; // 获得鼠标所在的前一个位置
curPos = pos;
CDC* pDC = g_pView->GetDC(); // 得到设备环境指针
// 创建临时对象擦除上一次的橡皮线
CLine* pTempLine1 = new CLine(m_center, prePos);
CCircle* pTempCircle1 = new CCircle(m_center, prePos);
if(!bRefresh){ // 当视窗没有被刷新时,重画原来的橡皮线使其被擦除
pTempLine1->Draw(pDC, dmDrag);
pTempCircle1->Draw(pDC, dmDrag);
}
delete pTempCircle1;
delete pTempLine1;
// 创建临时对象,根据当前位置绘制橡皮线
CLine* pTempLine2 = new CLine(m_center, curPos);
CCircle* pTempCircle2 = new CCircle(m_center, curPos);
pTempLine2->Draw(pDC, dmDrag);
pTempCircle2->Draw(pDC, dmDrag);
delete pTempCircle2;
delete pTempLine2;
g_pView->ReleaseDC(pDC); // 释放设备环境指针
m_pos = curPos; // 将当前位置设置为直线终点,以备下一次鼠标移动时用
break;
}
}
return 0;
}
// 单击鼠标右键取消当前的操作
int CCreateCircle::OnRButtonDown(UINT nFlags, const Position& pos)
{
// 如果当前的操作步为 1 ,那么要在结束本次操作前擦除上次鼠标移动时绘制的橡皮线
if(m_nStep == 1){
CDC* pDC = g_pView->GetDC(); // 得到设备环境指针
Position prePos = m_pos; // 获得鼠标所在的前一个位置
CLine* pTempLine = new CLine(m_center, prePos);
CCircle* pTempCircle = new CCircle(m_center, prePos);
pTempLine->Draw(pDC, dmDrag); // 擦除上一次绘制的橡皮线
pTempCircle->Draw(pDC, dmDrag);
delete pTempCircle;
g_pView->ReleaseDC(pDC); /