glutBitmapChar and my score.
Post: #1
I've coded a delightful game in C using GLUT, but every time I run it, it goes to GDB. Boohoo. I'm trying to get the game to use glutBitmapCharacter to present my score, but it doesn't.
main.c:
main.c:
Code:
#include <stdlib.h>
#include <math.h>
#include <GLUT/glut.h>
/*
We are going to have 2 enemies onscreen, coming from a random side of the screen and going to the opposite side.
__________
| <o |
| + <o |
|________|
<o Enemies
+ Player.
*/
enum
{
false,
true
};
typedef unsigned char Bool;
typedef enum
{
ENTER = 3,
TAB = 9,
RETURN = 13,
ESC = 27,
SPACE = 32,
DEL = 127,
UP_ARROW, DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW,
NUM_KEY_CODES
} KeyCode;
Bool key[NUM_KEY_CODES], keyDown[NUM_KEY_CODES], keyUp[NUM_KEY_CODES];
int lastFrameTime = 0;
float dt; // delta time (how much time in between frames, used for all movement calculations)
float shipPosX;
float shipPosY;
float shipVelX;
float shipVelY;
int dir;
int amfiring;
float enemy1X;
float enemy1Y;
float enemy2X;
float enemy2Y;
float dific;
int score;
char
scorestr;
int playgame;
int enemystartplace; // 1 = north, 2 = east, 3 = south, 4 = west, 0 = null
int enemymoving; // bool: 1= true, 0= false
enemymoving = 0;
playgame = 1;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// LASER ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void fire()
{
if (dir==0)
{
//works here
glBegin(GL_LINES);
glColor3d(1.0,0.0,0.0);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX,shipPosY+(1050-shipPosY),0.0f);
glEnd();
}
else if (dir==90)
{
glBegin(GL_LINES);
glColor3d(1.0,0.0,0.0);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX+(1680-shipPosX),shipPosY,0.0f);
glEnd();
}
else if (dir==180)
{
glBegin(GL_LINES);
glColor3d(1.0,0.0,0.0);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX,shipPosY-shipPosY,0.0f);
glEnd();
}
else if (dir==-90)
{
glBegin(GL_LINES);
glColor3d(1.0,0.0,0.0);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX-(shipPosX+shipPosX),shipPosY,0.0f);
glEnd();
}
}
void resetKeyboardInput(void)
{
int i;
for (i = 0; i < NUM_KEY_CODES; i++)
{
keyDown[i] = false;
keyUp[i] = false;
}
}
void keyboard(unsigned char rawKeyCode, int x, int y)
{
if (rawKeyCode < NUM_KEY_CODES)
{
key[rawKeyCode] = true;
keyDown[rawKeyCode] = true;
}
}
void keyboardUp(unsigned char rawKeyCode, int x, int y)
{
if (rawKeyCode < NUM_KEY_CODES)
{
key[rawKeyCode] = false;
keyUp[rawKeyCode] = false;
}
}
void keyboardSpecial(int rawKeyCode, int x, int y)
{
switch (rawKeyCode)
{
case GLUT_KEY_LEFT:
key[LEFT_ARROW] = true;
keyDown[LEFT_ARROW] = true;
break;
case GLUT_KEY_UP:
key[UP_ARROW] = true;
keyDown[UP_ARROW] = true;
break;
case GLUT_KEY_RIGHT:
key[RIGHT_ARROW] = true;
keyDown[RIGHT_ARROW] = true;
break;
case GLUT_KEY_DOWN:
key[DOWN_ARROW] = true;
keyDown[DOWN_ARROW] = true;
break;
}
}
void keyboardSpecialUp(int rawKeyCode, int x, int y)
{
switch (rawKeyCode)
{
case GLUT_KEY_LEFT:
key[LEFT_ARROW] = false;
keyUp[LEFT_ARROW] = true;
break;
case GLUT_KEY_UP:
key[UP_ARROW] = false;
keyUp[UP_ARROW] = true;
break;
case GLUT_KEY_RIGHT:
key[RIGHT_ARROW] = false;
keyUp[RIGHT_ARROW] = true;
break;
case GLUT_KEY_DOWN:
key[DOWN_ARROW] = false;
keyUp[DOWN_ARROW] = true;
break;
}
}
drawGLString(GLfloat x, GLfloat y, char *textString)
{
int le;
int qs;
glRasterPos2f(x, y);
le = (int) strlen(textString);
for (qs = 0; qs < le; qs++)
{
glutBitmapCharacter(GLUT_BITMAP_8_BY_13, textString[qs]);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// DISPLAY ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void display(void)
{
if (playgame == 1)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_QUADS);
glColor3d(0.2,0.2,0.2);
glVertex3f(0.0f,1050.0f,0.0f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(1680.0f,0.0f,0.0f);
glVertex3f(1680.0f,1050.0f,0.0f);
glEnd();
if (lastFrameTime == 0)
{
lastFrameTime = glutGet(GLUT_ELAPSED_TIME);
}
int now = glutGet(GLUT_ELAPSED_TIME);
int elapsedMilliseconds = now - lastFrameTime;
float dt = elapsedMilliseconds / 1000.0f;
lastFrameTime = now;
// "key" is cached locally so that it stays down until the next key up event
if (key[LEFT_ARROW])
{
shipPosX -= 200.0f * dt;
dir = -90;
}
if (key[RIGHT_ARROW])
{
shipPosX += 200.0f * dt;
dir = 90;
}
if (key[UP_ARROW])
{
shipPosY += 200.0f * dt;
dir = 0;
}
if (key[DOWN_ARROW])
{
shipPosY -= 200.0f * dt;
dir =180;
}
if (key[SPACE])
{
amfiring = 1;
fire();
}
/*
if (shipVelX > 2 )
{
shipVelX = 2;
}
if (shipVelX < -2)
{
shipVelX = -2;
}
if (shipVelY > 2 )
{
shipVelY = 2;
}
if (shipVelY < -2 )
{
shipVelY = -2;
}
*/
else
{
amfiring = 0;
}
// velocity for the 'ship'
shipPosX += shipVelX;
shipPosY += shipVelY;
// enemy
if (enemymoving == 0)
{
enemy1X = 0;
enemy1Y = 0;
enemystartplace = ( rand() %4) + 1;
if (enemystartplace == 1)
{
enemy1X = rand() %1680;
enemy1Y = 1680;
}
else if (enemystartplace == 2)
{
enemy1Y = rand() %1050;
enemy1X = 1680;
}
else if (enemystartplace == 3)
{
enemy1X = rand()%1680;
}
else if (enemystartplace == 4)
{
enemy1Y = rand() %1050;
enemy1X = 0;
}
enemymoving=1;
}
else
{
if ((enemystartplace == 2 && enemy1X == 0) || (enemystartplace == 1 && enemy1Y == 0) || (enemystartplace == 3 && enemy1Y == 1050) || (enemystartplace == 4 && enemy1X == 1680))
{
enemymoving = 0;
drawGLString(0,0,"Game Over");
}
if ((amfiring == 1) && (enemymoving == 1))
{
if (((dir==0) && ( (round(shipPosX/40)) == (round(enemy1X/40)) ) ) && (shipPosY < enemy1Y))
{
enemymoving = 0;
NSBeep();
score++;
dific += 0.2;
}
else if (((dir==90) && ( (round(shipPosY/40)) == (round(enemy1Y/40)) ) ) && (shipPosX < enemy1X))
{
enemymoving = 0;
NSBeep();
score++;
dific += 0.2;
}
else if (((dir==180) && ( (round(shipPosX/40)) == (round(enemy1X/40)) ) ) && (shipPosY > enemy1Y))
{
enemymoving = 0;
NSBeep();
score++;
dific += 0.2;
}
else if (((dir==-90) && ( (round(shipPosY/40)) == (round(enemy1Y/40)) ) ) && (shipPosX > enemy1X))
{
enemymoving = 0;
NSBeep();
score++;
dific += 0.2;
}
if (dific > 4 )
{
dific = 4;
}
}
//scorestr = (char*) score;
// score
drawGLString(0,0, score );
glBegin(GL_QUADS);
glColor3d(0.0,0.0,1.0);
glVertex3f(enemy1X+20,enemy1Y+20, 0.0f);
glVertex3f(enemy1X-20,enemy1Y+20, 0.0f);
glVertex3f(enemy1X-20,enemy1Y-20, 0.0f);
glVertex3f(enemy1X+20,enemy1Y-20, 0.0f);
glVertex3f(enemy1X+20,enemy1Y+20, 0.0f);
glEnd();
if (enemystartplace == 2)
{
enemy1X -= dific ;
}
else if (enemystartplace == 1)
{
enemy1Y -= dific;
}
else if (enemystartplace == 3)
{
enemy1Y += dific;
}
else if (enemystartplace == 4)
{
enemy1X += dific;
}
}
// also do wasd to demonstrate discrete "keyDown" events
// This code is where you put all drawing code. v
// draw the ship @ the position
glBegin(GL_QUADS);
glColor3d(0.5,0.5,0.5);
glVertex3f(shipPosX-40,shipPosY-40, 0.0f);
glVertex3f(shipPosX+40,shipPosY-40, 0.0f);
glVertex3f(shipPosX+40, shipPosY+40, 0.0f);
glVertex3f(shipPosX-40,shipPosY+40,0.0f);
glEnd();
glBegin(GL_LINE_LOOP);
glColor3d(1.0,1.0,1.0);
glVertex3f(shipPosX-30,shipPosY-30, 0.0f);
glVertex3f(shipPosX+30,shipPosY-30, 0.0f);
glVertex3f(shipPosX+30, shipPosY+30, 0.0f);
glVertex3f(shipPosX-30,shipPosY+30,0.0f);
glEnd();
if (dir==0)
{
glBegin(GL_LINES);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX,shipPosY+40,0.0f);
glEnd();
}
else if (dir==90)
{
glBegin(GL_LINES);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX+40,shipPosY,0.0f);
glEnd();
}
else if (dir==180)
{
glBegin(GL_LINES);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX,shipPosY-40,0.0f);
glEnd();
}
else if (dir==-90)
{
glBegin(GL_LINES);
glVertex3f(shipPosX,shipPosY,0.0f);
glVertex3f(shipPosX-40,shipPosY,0.0f);
glEnd();
}
// That's the ship drawn
// drawframe
// do this to clear the key ups and key downs for each frame
}
else
{
}
glutSwapBuffers();
resetKeyboardInput();
}
void reshape(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, width, 0, height);
glMatrixMode(GL_MODELVIEW);
}
void idle(void)
{
glutPostRedisplay();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
//glutInitWindowSize(1680,1050);
glutInitWindowSize(640, 480);
glutCreateWindow("FATAL ERROR");
glutDisplayFunc(display);
glRasterPos2i(10, 10);
glutReshapeFunc(reshape);
glutIdleFunc(idle);
glutFullScreen();
glutKeyboardFunc(keyboard);
glutKeyboardUpFunc(keyboardUp);
glutSpecialFunc(keyboardSpecial);
glutSpecialUpFunc(keyboardSpecialUp);
//glutFullScreen();
glutMainLoop();
return EXIT_SUCCESS;
}~ Bring a Pen ~
Post: #2
You need to heed your compiler warnings. It should tell you that you're not sending a pointer to your drawGLString() function as you ought to. IOW, it's expecting a string and score ain't a string! You should do something like this instead:
Code:
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
char scoreString[32];
sprintf(scoreString, "%d", score);
drawGLString(0,0, scoreString);
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