在MFC中移动opengl 2d对象 [英] Move opengl 2d object in MFC

问题描述

我想在MFC中左右键击鼠标时移动并调整opengl方块的大小。我尝试了以下代码移动，但它闪烁。



我尝试过：



void OverlayDisplayDlg :: OnMouseMove（UINT nFlags_i，CPoint cpPoint_i）

{

float nDiffx = float（cpPoint_i.x - m_nXvalue）/ 10;

float nDiffy = float（cpPoint_i.y - m_nYvalue）/ 10;

m_nXvalue = cpPoint_i.x;

m_nYvalue = cpPoint_i.y;



if（MK_LBUTTON == nFlags_i）

{

glClear（GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT）; //清除颜色缓冲区

glMatrixMode（GL_PROJECTION）; //操作模型 - 视图矩阵

glLoadIdentity（）; //重置模型视图矩阵

// glPushMatrix（）;

glColor3f（1.0f，1.0f，0.0f）;

glBegin（GL_LINE_LOOP）;

glVertex2f（-0.3f + nDiffx， - 0.3f + nDiffy）; //以逆时针（CCW）顺序定义顶点

glVertex2f（0.3f + nDiffx，-0.3f + nDiffy）; //使正常（正面）面向你

glVertex2f（0.3f + nDiffx，0.3f + nDiffy）;

glVertex2f（-0.3f + nDiffx ，0.3f + nDiffy）;

glEnd（）;

// glPopMatrix（）;

SwapBuffers（m_hDeviceContextDC）;

}

CDialogEx :: OnMouseMove（nFlags_i，cpPoint_i）;

}



以上代码用于移动，但它无法正常工作。请帮助我。

I want to move and resize an opengl square on left and right button click of mouse in MFC. I tried the below code for moving , but it flickers.

What I have tried:

void OverlayDisplayDlg::OnMouseMove(UINT nFlags_i, CPoint cpPoint_i)
{
float nDiffx = float(cpPoint_i.x - m_nXvalue)/ 10;
float nDiffy = float(cpPoint_i.y - m_nYvalue)/ 10;
m_nXvalue = cpPoint_i.x;
m_nYvalue = cpPoint_i.y;

if(MK_LBUTTON == nFlags_i)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); // Clear the color buffer
glMatrixMode(GL_PROJECTION); // To operate on Model-View matrix
glLoadIdentity(); // Reset the model-view matrix
//glPushMatrix();
glColor3f(1.0f,1.0f,0.0f);
glBegin(GL_LINE_LOOP);
glVertex2f(-0.3f + nDiffx, -0.3f + nDiffy); // Define vertices in counter-clockwise (CCW) order
glVertex2f( 0.3f + nDiffx, -0.3f + nDiffy); // so that the normal (front-face) is facing you
glVertex2f( 0.3f + nDiffx, 0.3f + nDiffy);
glVertex2f(-0.3f + nDiffx, 0.3f + nDiffy);
glEnd();
//glPopMatrix();
SwapBuffers(m_hDeviceContextDC);
}
CDialogEx::OnMouseMove(nFlags_i, cpPoint_i);
}

the above code is for moving, but it does not work properly. Please help me.

推荐答案

请参阅捕获鼠标 [ ^ ]。

您不应该在鼠标移动方法中进行屏幕绘制。您应捕获指示移动或调整大小的每条消息，然后使用 InvalidateRect 告诉Windows您的数据已更新。然后在疼痛方法中重新绘制，处理 WM_PAINT 消息。

You should not do screen painting in the mouse move method. You should capture each message that indicates a move or resize, and then use InvalidateRect to tell Windows that your data has been updated. Then you do the repainting in your pain method that handles the WM_PAINT messages.

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