// Program to demonstrate how to open a window size and position it properly
// Animated version of basicwindow.c
// Left mouse button fires the cannonball again
// Q or q or ESC quits the program
// R or C determines whether to use a circle or a rectangle
// This variation by Mr. Latimer
#include <stdlib.h>
#include <GL/glut.h>
int wide=300, high=300; // Global Variables for Length and Width
int winX=40, winY=40; // X and Y positions for window
double xPos;
double yPos;
double MinX=-2.0;
double MaxX=2.0;
double MinY=-2.0;
double MaxY=2.0;
double MinZ=-1.0;
double MaxZ=1.0;
double RADIUS=0.1;
int DRAWCIRCLE;
// Draw text on the screen using pre-defined Bitmap character fonts
// Passed arguments include location in 3-space, pointer to string,
// pointer to font
void bitmap_output(int x, int y, int z, char *string, void *font)
{ int len, i;
glRasterPos3f(x, y, 0); // Locate Raster Position in 3-space
len = (int) strlen(string); // Find length of string
for (i = 0; i < len; i++) // Loop through plotting all characters
{ // in font style
glutBitmapCharacter(font, string[i]);
}
}
void DrawMyStuff() // The Drawing Routine
{
// double x,y;
GLUquadricObj *p;
glPushMatrix();
p = gluNewQuadric();
glColor3f(1.0, 1.0, 0.0); // Set drawing color to yellow
yPos = 4* xPos - 4* xPos * xPos ; // Calculate y value of parabola
glTranslatef(xPos,yPos,0.0);
gluQuadricDrawStyle(p, GLU_FILL);//Use GLU_SILHOUETTE for a circle outline
gluDisk(p,0,0.1,20,1); //gluDisk(p, innerRadius, outerRadius,
// slices, rings);
glPopMatrix();
if (xPos <= 1) xPos += .001;
}
void DrawMyStuffRectangle()
{
glColor3f(1.0, 1.0, 0.0);
yPos = 4* xPos - 4* xPos * xPos ; // Calculate y value of parabola
glRectf(xPos, yPos, xPos+.4, yPos+.4);
if (xPos <= 1) xPos += .001;
}
void DrawAxis()
{
glColor3f(0.0,0.0,0.0);
glBegin(GL_LINES);
glVertex2f(MinX, 0);
glVertex2f(MaxX, 0);
glVertex2f(0 , MinY);
glVertex2f(0 , MaxY);
glEnd();
glFlush();
}
void display(void)
{ /* clear all pixels */
glClear(GL_COLOR_BUFFER_BIT);
DrawAxis();
glPushMatrix(); // New frame of reference
glTranslatef(0.5, -1.0, 0); // Move to new location
glColor3f(0.0,1.0,0.1);
bitmap_output(0,0,0, "It Works!", GLUT_BITMAP_TIMES_ROMAN_24);
glPopMatrix(); // Return to old reference
if (DRAWCIRCLE == 1)
DrawMyStuff(); // Call my Drawing Routine
else DrawMyStuffRectangle();
glutSwapBuffers();
glFlush(); // Force writing all pending OpenGL actions to the screen.
if (xPos <=1)
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
printf("Key pressed= %c %d\n", key, key);
if (key == 'q' || key == 'Q' || key == (unsigned char) 27)
exit(0); // This should work: key == '\27'
if (key == 'r' || key == 'R')
DRAWCIRCLE = 0;
if (key == 'c' || key == 'C')
DRAWCIRCLE = 1;
}
void mouse(int button, int state, int x, int y)
{
if (state == GLUT_DOWN && button == GLUT_LEFT_BUTTON)
{
xPos = -1.0;
glutPostRedisplay();
}
}
void myinit(void)
{
xPos = -1.0;
DRAWCIRCLE = 1;
/* select clearing (background) color */
glClearColor(0.5, 0.5, 0.5, 0.0); // These RGB values make gray
/* initialize viewing values */
glMatrixMode(GL_PROJECTION); // Select Matrix Mode
glLoadIdentity(); // Provide Base Matrix
glOrtho(MinX, MaxX, MinY, MaxY, MinZ, MaxZ); // Set window dimensions
// Parameters: glOrtho(Left, Right, Bottom, Top, Front, Back)
DrawAxis();
}
/* Declare initial window size, position, and display mode */
int main(int argc, char* argv[])
{
printf("Creating window %d pixels wide and %d pixels high", wide, high);
printf(" at (%d,%d).\n", winX, winY);
glutInit(&argc, argv); // Call glut's initialization routine
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB); // Set Single Buffer, RGB Color
glutInitWindowSize(wide, high); // Initialize window size
glutInitWindowPosition(winX,winY); // Position window
glutCreateWindow("My Window"); // Actually create window with title
myinit(); // Call my initialization routine
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutDisplayFunc(display); // Call my display routine
glutMainLoop(); // Fall into glut's main event loop
return 0;
}
/*
* Adapted for use in Supercomputer Applications
* at TJHSST from the OpenGL Tutor by Mahesh Kumar
* Parts of this program might have been adopted from or inspired by
* sample programs in
* "OpenGL Programming Guide",
* Copyright (c) 1993-1997, Silicon Graphics, Inc.
* "Interactive Computer Graphics"
* Copyright (c) 1997, Addison-Wesley,
* and/or those written by Dr. Sumanta Guha guha@cs.uwm.edu
* and/or those written by Dr. Ichiro Suzuki suzuki@cs.uwm.edu
*/
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