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  Simple Mouse Class
  Submitted by

I wrote this class to simplify the use of the mouse in my OpenGL applications, its nothing extravagant, but it gets the job done. The class will work with Win32 or GLUT programs, a simple GLUT demo of the class is included. Do whatever you like with the class or the example. This code is for the beginners out there, the more advanced coders will write their own code :)

Nate Miller

Currently browsing [] (1,830 bytes) - [mouse.h] - (3,283 bytes)

   To use this mouse class with GLUT make sure that you #define __GLUTMOUSE__
before you #include "mouse.h".  I was thinking about having this header check 
for GLUT #defines, but you would have had to #include <glut.h> before this 
header which could lead to problems.  
#ifndef __MOUSEH__
#define __MOUSEH__

#ifdef _WIN32 #define WIN32_LEAN_AND_MEAN #include <windows.h> #endif #ifdef __GLUTMOUSE__ #include <GL/glut.h> #endif

struct mouse_t { mouse_t() {oldX = oldY = currX = currY = -1; state = 0;}

// for win32 apps, ste isn't needed inline void SetState(int btn, int ste = 0); inline void SetNewPos(int x, int y); int IsLeft(void) const {return (state & buttonLeft);} int IsRight(void) const {return (state & buttonRight);} int IsMiddle(void) const {return (state & buttonMiddle);} void Reset(void) {state = 0;} int GetOldX(void) const {return oldX;} int GetOldY(void) const {return oldY;} int GetX(void) const {return currX;} int GetY(void) const {return currY;} int GetDiffX(int x) const {return x - oldX;} int GetDiffY(int y) const {return y - oldY;} int GetDiffX(void) const {return currX - oldX;} int GetDiffY(void) const {return currY - oldY;} void SetOldPos(int x, int y) {oldX = x; oldY = y;} #ifdef _WIN32 void Capture(HWND hWnd) const {SetCapture(hWnd);} void Release(void) const {ReleaseCapture();} #endif protected: enum { buttonLeft = 1, buttonRight = 2, buttonMiddle = 4, };

int state; int oldX; int oldY; int currX; int currY; };

inline void mouse_t::SetState(int btn, int ste) { #ifdef _WIN32 #ifndef __GLUTMOUSE__ switch (btn) { case WM_LBUTTONDOWN: state |= buttonLeft; break; case WM_RBUTTONDOWN: state |= buttonRight; break; case WM_MBUTTONDOWN: state |= buttonMiddle; break; case WM_LBUTTONUP: state &= ~buttonLeft; break; case WM_RBUTTONUP: state &= ~buttonRight; break; case WM_MBUTTONUP: state &= ~buttonMiddle; break; } #endif #endif

#ifdef __GLUTMOUSE__ if (ste == GLUT_DOWN) { switch(btn) { case GLUT_LEFT_BUTTON: state |= buttonLeft; break; case GLUT_RIGHT_BUTTON: state |= buttonRight; break; case GLUT_MIDDLE_BUTTON: state |= buttonMiddle; break; } } else if (ste == GLUT_UP) { switch(btn) { case GLUT_LEFT_BUTTON: state &= ~buttonLeft; break; case GLUT_RIGHT_BUTTON: state &= ~buttonRight; break; case GLUT_MIDDLE_BUTTON: state &= ~buttonMiddle; break; } } #endif }

inline void mouse_t::SetNewPos(int x, int y) { currX = x; currY = y; #ifdef _WIN32 #ifndef __GLUTMOUSE__ if(currX & 1 << 15) currX -= (1 << 16);

if(currY & 1 << 15) currY -= (1 << 16); #endif #endif }


Currently browsing [] (1,830 bytes) - [main.cpp] - (1,663 bytes)

#define __GLUTMOUSE__ // important!!!!
#include "mouse.h"
#include <stdio.h>
#include <GL/glut.h>

int winW = 320; int winH = 320;

mouse_t mouse;

void glutDisplay(void) { glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glutSwapBuffers(); }

void glutResize (int w, int h) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glViewport(0, 0, (winW = w), (winH = h)); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(90, (double) winW / winH, 1, 4096); glutPostRedisplay(); }

void glutKeyboard(unsigned char key, int x, int y) { exit(1); }

void glutMouse(int button, int state, int x, int y) { mouse.SetState(button, state); mouse.SetNewPos(x, y); printf("Mouse %s At %d %d\n", (state == GLUT_DOWN) ? "Down" : "Up", x, y); }

void glutMotion(int x, int y) { mouse.SetOldPos(mouse.GetX(), mouse.GetY()); mouse.SetNewPos(x, y);

printf("Mouse Drag Button "); if (mouse.IsLeft()) printf("Left\n"); else if (mouse.IsRight()) printf("Right\n"); else printf("Middle\n");

printf("\tFrom %d %d\n", mouse.GetOldX(), mouse.GetOldY()); printf("\tTo %d %d\n", mouse.GetX(), mouse.GetY()); printf("\tChange %d %d\n", mouse.GetDiffX(), mouse.GetDiffY()); }

void main (void) { glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize(winW,winH); glutCreateWindow("Mouse Test"); glutDisplayFunc(glutDisplay); glutReshapeFunc(glutResize); glutKeyboardFunc(glutKeyboard); glutMouseFunc(glutMouse); glutMotionFunc(glutMotion); glutMainLoop(); }

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