【答对追加30分】OpenGL在MFC中鼠标调用问题！

我还没在MFC用过openGL，下面这个程序是控制台应用程序，是用鼠标模拟虚拟球控制立方体旋转，是用的glutMouseFunc()，移植到MFC中应该是可以用的，希望对你有帮助。

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#include <math.h>

#include <GL/glut.h>

#include <stdlib.h>

int winWidth, winHeight

float angle = 0.0, axis[3], trans[3]

bool trackingMouse = false

bool redrawContinue = false

bool trackballMove = false

GLfloat vertices[][3] = {

{-1.0,-1.0,-1.0}, {1.0,-1.0,-1.0}, {1.0,1.0,-1.0}, {-1.0,1.0,-1.0},

{-1.0,-1.0,1.0}, {1.0,-1.0,1.0}, {1.0,1.0,1.0}, {-1.0,1.0,1.0}

}

GLfloat colors[][3] = {

{0.0,0.0,0.0}, {1.0,0.0,0.0}, {1.0,1.0,0.0}, {0.0,1.0,0.0},

{0.0,0.0,1.0}, {1.0,0.0,1.0}, {1.0,1.0,1.0}, {0.0,1.0,1.0}

}

void polygon(int a, int b, int c , int d, int face)

{

glBegin(GL_POLYGON)

glColor3fv(colors[a])

glVertex3fv(vertices[a])

glColor3fv(colors[b])

glVertex3fv(vertices[b])

glColor3fv(colors[c])

glVertex3fv(vertices[c])

glColor3fv(colors[d])

glVertex3fv(vertices[d])

glEnd()

}

void colorcube(void)

{

polygon(1,0,3,2,0)

polygon(3,7,6,2,1)

polygon(7,3,0,4,2)

polygon(2,6,5,1,3)

polygon(4,5,6,7,4)

polygon(5,4,0,1,5)

}

float lastPos[3] = {0.0F, 0.0F, 0.0F}

int curx, cury

int startX, startY

void trackball_ptov(int x, int y, int width, int height, float v[3])

{

float d, a

v[0] = (2.0F*x - width) / width

v[1] = (height - 2.0F*y) / height

d = (float) sqrt(v[0]*v[0] + v[1]*v[1])

v[2] = (float) cos((3.1415926/2.0F) * ((d <1.0F) ? d : 1.0F))

a = 1.0F / (float) sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2])

v[0] *= a

v[1] *= a

v[2] *= a

}

void mouseMotion(int x, int y)

{

float curPos[3], dx, dy, dz

trackball_ptov(x, y, winWidth, winHeight, curPos)

if(trackingMouse)

{

dx = curPos[0] - lastPos[0]

dy = curPos[1] - lastPos[1]

dz = curPos[2] - lastPos[2]

if (dx || dy || dz) {

angle = 180.0/3.1415926 * sqrt(dx*dx + dy*dy + dz*dz)

axis[0] = lastPos[1]*curPos[2] - lastPos[2]*curPos[1]//叉积

axis[1] = lastPos[2]*curPos[0] - lastPos[0]*curPos[2]

axis[2] = lastPos[0]*curPos[1] - lastPos[1]*curPos[0]

lastPos[0] = curPos[0]

lastPos[1] = curPos[1]

lastPos[2] = curPos[2]

}

}

glutPostRedisplay()

}

void startMotion(int x, int y)

{

trackingMouse = true

redrawContinue = false

startX = xstartY = y

curx = xcury = y

trackball_ptov(x, y, winWidth, winHeight, lastPos)

trackballMove=true

}

void stopMotion(int x, int y)

{

trackingMouse = false

if (startX != x || startY != y) {

redrawContinue = true

} else {

angle = 0.0F

redrawContinue = false

trackballMove = false

}

}

void display(void)

{

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)

if (trackballMove)

{

glRotatef(angle, axis[0], axis[1], axis[2])

}

colorcube()

glutSwapBuffers()

}

void mouseButton(int button, int state, int x, int y)

{

if(button==GLUT_RIGHT_BUTTON) exit(0)

if(button==GLUT_LEFT_BUTTON) switch(state)

{

case GLUT_DOWN:

y=winHeight-y

startMotion(x,y)

break

case GLUT_UP:

stopMotion(x,y)

break

}

}

void myReshape(int w, int h)

{

glViewport(0, 0, w, h)

winWidth = w

winHeight = h

glMatrixMode(GL_PROJECTION)

glLoadIdentity()

if (w <= h)

glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,

2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0)

else

glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,

2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0)

glMatrixMode(GL_MODELVIEW)

}

void spinCube()

{

if (redrawContinue) glutPostRedisplay()

}

int main(int argc, char **argv)

{

glutInit(&argc, argv)

glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)

glutInitWindowSize(500, 500)

glutCreateWindow("colorcube")

glutReshapeFunc(myReshape)

glutDisplayFunc(display)

glutIdleFunc(spinCube)

glutMouseFunc(mouseButton)

glutMotionFunc(mouseMotion)

glEnable(GL_DEPTH_TEST)

glMatrixMode(GL_PROJECTION)

glLoadIdentity()

glOrtho(-2.0, 2.0, -2.0, 2.0, -2.0, 2.0)

glMatrixMode(GL_MODELVIEW)

glutMainLoop()

}

这些都是opengl中的基本问题，都是通过注册一个函数来实现的

我这里仅回答第二个问题，第一个问题类似：

先注册一个函数glutSpecialFunc(SpecialKeys)

函数SpecialKeys的结构形式如下：

void SpecialKeys(int key, int x, int y)

{

if(key == GLUT_KEY_UP)

xRot-= 5.0f

if(key == GLUT_KEY_DOWN)

xRot += 5.0f

if(key == GLUT_KEY_LEFT)

yRot -= 5.0f

if(key == GLUT_KEY_RIGHT)

yRot += 5.0f

}

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这只是OpenGL的实现方式。如果你开发的MFC程序，你可以通过注册相关的消息来实现键盘与鼠标的响应。

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