Sunday, June 12, 2011

Mouse event handling source code in OpenGL



This source code is  written in C++ with OpenGL.It is just a demo for mouse event handling you can use this code for your project.In this example void motionPassive(int x, int y) to find out the cursor position in the window.By finding the difference between the previous and initial position the direction of camera is changed.



#include <windows.h>
#include <cmath>
#include <cstdlib>
#include <GL/glut.h>
#include <iostream>
 
using namespace std;
float lastx, lasty;
float angle=0.0,ratio;
float x=0.0f,y=0.0f,z=0.5f;
float lx=0.0f,ly=0.0f,lz=-1.0f;
float _angle = 30.0f;
float _cameraAngle = 0.0f;
 
void RotY(float ang) {
 
lx = sin(ang);
lz = -cos(ang);
glLoadIdentity();
gluLookAt(x, y, z,
x + lx,y + ly,z + lz,
0.0f,1.0f,0.0f);
}
 
void moveFB(int direction) {
x = x + direction*(lx)*0.1;
z = z + direction*(lz)*0.1;
glLoadIdentity();
gluLookAt(x, y, z,
x + lx,y + ly,z + lz,
0.0f,1.0f,0.0f);
}
 
 
 
void LookUpDown(float ang) {
ly = sin(ang);
lz = -cos(ang);
glLoadIdentity();
gluLookAt(x, y, z,
x + lx,y + ly,z + lz,
0,1,0);
if (angle > 360) {
angle -= 360;
}
}
 
 
 
 
void initRendering() {
glEnable(GL_DEPTH_TEST);
}
 
void handleKeypress(unsigned char key,
int x, int y) {
switch (key) {
case 27:
exit(0);
 
}
}
 
void handleSpecialKey(int key, int x, int y) {
 
switch (key) {
case GLUT_KEY_LEFT :
angle -= 0.1f;
RotY(angle);
break;
case GLUT_KEY_RIGHT :
angle +=0.1f;
RotY(angle);
break;
case GLUT_KEY_UP :
moveFB(1);
break;
case GLUT_KEY_DOWN :
moveFB(-1);
break;
case GLUT_KEY_PAGE_UP :
angle +=0.01f;
LookUpDown(angle);
break;
case GLUT_KEY_PAGE_DOWN :
angle -=0.01f;
LookUpDown(angle);
break;
 
 
}
}
void motionPassive(int x, int y)
{
glutSetCursor(GLUT_CURSOR_FULL_CROSSHAIR);
 
cout << "Mouse moved at "
<< "(" << x << "," << y << ")" << endl;
 
 
 
 
int diffx=x-lastx; //check the difference between the current x and the last x position
int diffy=y-lasty; //check the difference between the current y and the last y position
lastx=x; //set lastx to the current x position
lasty=y; //set lasty to the current y position
angle += (float) diffy;
RotY(angle/20); //set the xrot to xrot with the addition of the difference in the y position
angle += (float) diffx;
RotY(angle/20);    //set the xrot to yrot with the addition of the difference in the x position
 
 
 
 
}
 
 
 
 
void handleResize(int w, int h) {
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,
(double)w / (double)h,
0.25,
200.0);
}
 
void drawScene() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_COLOR_MATERIAL);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(x, y, z,
x + lx,y + ly,z + lz,
0.0f,1.0f,0.0f);
 
 
//glRotatef(LookUpDown,1.0,0,0);
glPushMatrix();
 
glTranslatef(0.0f, 0.0f, 0.0f);
glRotatef(_angle, 0.0f, 1.0f, 0.0f);
glScalef(0.01f, 0.01f, 0.01f);
glBegin(GL_QUADS);
//Cross back
glColor4f(1.0f,1.0f, 0.0f, 0.9f);
glVertex3f(-0.5, 2.5, -0.5);
glVertex3f(-0.5, -3.0, -0.5);
glVertex3f(0.5, -3.0, -0.5);
glVertex3f(0.5, 2.5, -0.5);
 
glVertex3f(-2.0, 1.0, -0.5);
glVertex3f(-2.0, 0.0, -0.5);
glVertex3f(2.0, 0.0, -0.5);
glVertex3f(2.0, 1.0, -0.5);
 
 
//Cross front
glColor4f(1.0f, 1.0f, 0.0f, 0.5f);
glVertex3f(-0.5, 2.5, 0.5);
glVertex3f(-0.5, -3.0, 0.5);
glVertex3f(0.5, -3.0, 0.5);
glVertex3f(0.5, 2.5, 0.5);
 
glVertex3f(-2.0, 1.0, 0.5);
glVertex3f(-2.0, 0.0, 0.5);
glVertex3f(2.0, 0.0, 0.5);
glVertex3f(2.0, 1.0, 0.5);
 
//Cross top
glVertex3f(0.5, 2.5, 0.5);
glVertex3f(-0.5, 2.5, 0.5);
glVertex3f(-0.5, 2.5, -0.5);
glVertex3f(0.5, 2.5, -0.5);
//Cross left top side
glVertex3f(-0.5, 2.5, 0.5);
glVertex3f(-0.5, 2.5, -0.5);
glVertex3f(-0.5, 1.0, -0.5);
glVertex3f(-0.5, 1.0, 0.5);
//Cross left side  top
glVertex3f(-0.5, 1.0, 0.5);
glVertex3f(-0.5, 1.0, -0.5);
glVertex3f(-2.0, 1.0, -0.5);
glVertex3f(-2.0, 1.0, 0.5);
 
//Cross left side  end
glVertex3f(-2.0, 1.0, 0.5);
glVertex3f(-2.0, 1.0, -0.5);
glVertex3f(-2.0, 0.0, -0.5);
glVertex3f(-2.0, 0.0, 0.5);
 
//Cross left side bottom
glVertex3f(-2.0, 0.0, 0.5);
glVertex3f(-0.5, 0.0, 0.5);
glVertex3f(-0.5, 0.0, -0.5);
glVertex3f(-2.0, 0.0, -0.5);
//Cross left bottom side
glVertex3f(-0.5, 0.0, 0.5);
glVertex3f(-0.5, 0.0, -0.5);
glVertex3f(-0.5, -3.0, -0.5);
glVertex3f(-0.5, -3.0, 0.5);
//Cross  bottom
glVertex3f(0.5, -3.0, 0.5);
glVertex3f(0.5, -3.0, -0.5);
glVertex3f(-0.5, -3.0, -0.5);
glVertex3f(-0.5, -3.0, 0.5);
 
//Cross right bottom side
glVertex3f(0.5, 0.0, 0.5);
glVertex3f(0.5, -3.0, 0.5);
glVertex3f(0.5, -3.0, -0.5);
glVertex3f(0.5, 0.0, -0.5);
 
//Cross right side bottom
glVertex3f(0.5, 0.0, 0.5);
glVertex3f(0.5, 0.0, -0.5);
glVertex3f(2.0, 0.0, -0.5);
glVertex3f(2.0, 0.0, 0.5);
//Cross right side end
glVertex3f(2.0, 1.0, 0.5);
glVertex3f(2.0, 0.0, 0.5);
glVertex3f(2.0, 0.0, -0.5);
glVertex3f(2.0, 1.0, -0.5);
 
//Cross right side top
glVertex3f(0.5, 1.0, 0.5);
glVertex3f(2.0, 1.0, 0.5);
glVertex3f(2.0, 1.0, -0.5);
glVertex3f(0.5, 1.0, -0.5);
//Cross right side top
glVertex3f(0.5, 1.0, 0.5);
glVertex3f(0.5, 1.0, -0.5);
glVertex3f(0.5, 2.5, -0.5);
glVertex3f(0.5, 2.5, 0.5);
glEnd();
glPopMatrix();
 
glPushMatrix();
glBegin(GL_QUADS);
glTranslatef(0.0f, -1.5f, 0.0f);
glRotatef(_angle,0.0,0.0,0.0);
//floor
glColor3f(0.5, 1.0, 0.0);
glVertex3f(-10.0,-0.5,10);
glVertex3f(-10.0,-0.5,-10);
glVertex3f(10.0,-0.5,-10);
glVertex3f(10.0,-0.5,10);
 
glEnd();
glPopMatrix();
glutSwapBuffers();
}
void update(int value) {
_angle += 4.0f;
if (_angle > 360) {
_angle -= 360;
}
 
glutPostRedisplay();
glutTimerFunc(25, update, 0);
}
int main(int argc, char** argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500,500);
glutCreateWindow("Rotaion Test");
initRendering();
 
//glutFullScreen();
glutDisplayFunc(drawScene);
glutKeyboardFunc(handleKeypress);
glutSpecialFunc(handleSpecialKey);
glutReshapeFunc(handleResize);
glutTimerFunc(25,update,0);
glutPassiveMotionFunc(motionPassive);
glutMainLoop();
return 0;
}







2 comments:

  1. can I get some more projects on openGL

    ReplyDelete
  2. can i get an openGL project on tic tac toe game

    ReplyDelete