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如何让下拉框随鼠标位置显示为平面或三维。

2003-10-26 10:12:33 117 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

ljn2 墨衍会员 · AI 创作全网分发关注 + 加入社区

基于VTK与C++的DICOM医学影像三维体绘制完整实现指南在计算机图形学与医学影像处理领域，三维可视化技术通过将二维切片数据重建为立体模型，为临床诊断与科研提供了直观的分析工具。其核心原理体绘制（Volume Rendering）直接对三维体数据进行渲染，通过光线投射算法模拟光线在体素中的吸收与发射，从而生成具有深度和半透明感的图像。这项技术的价值在于能够完整保留原始数据的空间信息，实现组织、器官和病灶的立体透视。在工程实践中，开发者常利用VTK等开源可视化工具包，结合C++高性能计算能力，构建从DICOM数据读取、预处理、传递函数设计到GPU加速渲染的完整管线。阅读详情

就是所谓热感应控件。有没有简单的方法。

...全文

Altium Designer三维PCB设计实战：从模型导入到干涉检查全解析在电子设计自动化（EDA）领域，三维模型的应用正从机械设计向电路板设计深度延伸，其核心原理在于通过数字孪生技术，在虚拟空间中构建产品的精确几何与物理表征。这项技术的核心价值在于，它能够将传统的二维电气连接验证，升级为涵盖机械装配、空间布局与散热管理的协同设计范式，从而在源头规避物理干涉与装配冲突。尤其在当前电子产品向高密度、微型化发展的趋势下，三维协同已成为提升设计一次成功率、缩短研发周期的关键技术。其典型应用场景包括消费电子、汽车电子、工业控制等对空间与可靠性要求严苛的领域。本文聚焦于主流EDA工具Alt 阅读详情

ljn2

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切换为时间正序

ljn2 2003-10-28

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很好用，谢谢。

qrlvls 2003-10-27

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// FlatComboBox.cpp : implementation file
//
// Copyright ?1998 Kirk Stowell
// All Rights Reserved.
//
// Email: kstowel@sprynet.com
// URL: www.geocities.com/SiliconValley/Haven/8230
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is
// not sold for profit without the authors written consent, and
// providing that this notice and the authors name and all copyright
// notices remains intact. If the source code in this file is used in
// any commercial application then a statement along the lines of
// "Portions Copyright ?1998 Kirk Stowell" must be included in
// the startup banner, "About" box or printed documentation. An email
// letting me know that you are using it would be nice as well. That's
// not much to ask considering the amount of work that went into this.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage/loss of business that
// this product may cause.
//
// Expect bugs!
//
// Please use and enjoy, and let me know of any bugs/mods/improvements
// that you have found/implemented and I will fix/incorporate them into
// this file.
//
// History:
// --------
// This control is constantly evolving, sometimes due to new features that I
// feel are necessary, and sometimes due to existing bugs. Where possible I
// have credited the changes to those who contributed code corrections or
// enhancements (names in brackets) or code suggestions (suggested by...)
//
// 1.0 02 Oct 1998 First release version.
// 1.01 05 Oct 1998 Fixed cross platform offset bug (Todd Brannam)
// to use GetSystemMetrics(), instead of hard coded values.
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "LSComboBox.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CLSComboBox

CLSComboBox::CLSComboBox()
{
m_bLBtnDown = false;
m_bAutoFocus = TRUE;
m_clr3DFace = GetSysColor(COLOR_3DFACE);
m_clr3DLight = GetSysColor(COLOR_3DLIGHT);
m_clr3DHilight = GetSysColor(COLOR_3DHILIGHT);
m_clr3DShadow = GetSysColor(COLOR_3DSHADOW);
m_clr3DDkShadow = GetSysColor(COLOR_3DDKSHADOW);
m_clrText = GetSysColor(COLOR_WINDOWTEXT);
m_clrBackground = GetSysColor(COLOR_WINDOW);
}

CLSComboBox::~CLSComboBox()
{
}

BEGIN_MESSAGE_MAP(CLSComboBox, CComboBox)
//{{AFX_MSG_MAP(CLSComboBox)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_WM_TIMER()
ON_WM_PAINT()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLSComboBox message handlers

void CLSComboBox::OnMouseMove(UINT nFlags, CPoint point)
{
SetTimer(1, 10, NULL);
CComboBox::OnMouseMove(nFlags, point);
}

void CLSComboBox::OnLButtonDown(UINT nFlags, CPoint point)
{
m_bLBtnDown = true;
CComboBox::OnLButtonDown(nFlags, point);
}

void CLSComboBox::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bLBtnDown = false;
Invalidate();
CComboBox::OnLButtonUp(nFlags, point);
}

void CLSComboBox::OnTimer(UINT nIDEvent)
{
POINT pt;
CRect rcItem;
static bool bPainted = false;

GetCursorPos(&pt);
GetWindowRect(&rcItem);

if (m_bLBtnDown==true) // 如果鼠标左键按下
{
KillTimer (1);
if (bPainted == true)
{
DrawCombo(FC_DRAWPRESSD, m_clr3DHilight, m_clr3DHilight);
bPainted = false;
}
return;
}

if (!rcItem.PtInRect(pt)) // 如果鼠标在组合框外
{
KillTimer (1);
if (bPainted == true)
{
DrawCombo(FC_DRAWNORMAL, m_clr3DFace, m_clr3DFace);
bPainted = false;
}
return;
}
else // 如果鼠标在组合框内
{
if (bPainted == true)
return;
else
{
bPainted = true;
if(m_bAutoFocus)
{
SetFocus();
DrawCombo(FC_DRAWRAISED, m_clr3DHilight, m_clr3DHilight);
}
else
DrawCombo(FC_DRAWRAISED, m_clr3DFace, m_clr3DFace);
}
}

CComboBox::OnTimer(nIDEvent);
}

void CLSComboBox::OnPaint()
{
Default();
DrawCombo(FC_DRAWNORMAL, m_clr3DFace, m_clr3DFace);
}

void CLSComboBox::DrawCombo(DWORD dwStyle, COLORREF clrTopLeft, COLORREF clrBottomRight)
{
CRect rcItem;
GetClientRect(&rcItem);
CDC* pDC = GetDC();

pDC->Draw3dRect(rcItem, clrTopLeft, clrBottomRight);
rcItem.DeflateRect(1,1);

if (!IsWindowEnabled())
{
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
return;
}

switch (dwStyle)
{
case FC_DRAWNORMAL:
pDC->Draw3dRect(rcItem, m_clr3DShadow, m_clr3DShadow);

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top --;
rcItem.bottom ++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DShadow);
rcItem.left --;
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
break;

case FC_DRAWRAISED:
pDC->Draw3dRect(rcItem, m_clr3DDkShadow, m_clr3DDkShadow); //边框

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
break;

case FC_DRAWPRESSD:
pDC->Draw3dRect(rcItem, m_clr3DDkShadow, m_clr3DDkShadow);

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DShadow, m_clr3DShadow);
break;
}

ReleaseDC(pDC);
}

int CLSComboBox::Offset()
{
return ::GetSystemMetrics(SM_CXHTHUMB);
}

void CLSComboBox::SetAutoFocus(BOOL bAutoFocs)
{
m_bAutoFocus = bAutoFocs;
}

huanyun 2003-10-26

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http://www.vckbase.com/code/listcode.asp?mclsid=3&sclsid=315

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如何让下拉框随鼠标位置显示为平面或三维。

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