答對追加30分OpenGL在MFC中鼠標調用問題！

我還沒在MFC用過openGL，下面這個程序是控制臺應用程序，是用鼠標模擬虛擬球控制立方體旋轉，是用的glutMouseFunc()，移植到MFC中應該是可以用的，希望對妳有幫助。

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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];//叉積

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 = x; startY = y;

curx = x; cury = 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();

}

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