draw objects using OpenGL output primitive functions

1. Load the Libraries:
#include<GL/glut.h>
#include<windows.h>

 2. Make a display function where you can draw your objects.
void display()
{
}

3. Inside the display function give the color of your screen.
    glClearColor(r,g,b);
    glClear(GL_COLOR_BUFFER_BIT);
where you are defining the intensity of the colors i.e the intensity of your Red, Green and Blue color.

4. Then draw you objects inside the display function.
Eg:  For Line
    glColor3f(r,g,b);
    glBegin(GL_LINES);
    glVertex2f(x,y);
    glVertex2f(x,y);
    glEnd();
for more click:output primitives

5. Render the Objects
    glFlush(); 
then close the display function.

6. now comes the main function
int main(int argc,char** argv)

7.  Iitialize the Arguments.
glutInit(&argc,argv);

8. Create the window and define the size
    glutCreateWindow("PROGRAM1");
    glutInitWindowSize(320,320);

9. use the glutDisplayFunc() to display your object.
    glutDisplayFunc(display);

10. glutMainLoop();
    return 0;

Basic Structure:

#include<GL/glut.h>
#include<windows.h>
void display()
{
   glClearColor(0.0,0.0,1.0,1.0);
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0,0.0,0.0);
    glBegin(GL_LINES);
    glVertex2f(0.0,0.0);
    glVertex2f(1.0,0.0);
    glEnd();

    glFlush();
}
int main(int argc,char** argv)
{
    glutInit(&argc,argv);
    glutCreateWindow("PROGRAM1");
    glutInitWindowSize(320,320);
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}

Comments

Post a Comment

Popular posts from this blog

OPENGL COLOR CODES

for Background color: glClearColor(float red, float green, float blue, float alpha) glClearColor(0.0,0.0,1.0,0.0);//dark blue fill color: glColor4f(1.0f, 0.0f, 0.0f, 0.0f);//red glColor4f(1.0f, 1.0f, 1.0f, 0.0f);//white glColor4f(1.0f, 1.0f, 0.0f, 0.0f);//yellow glColor4f(1.0f, 0.0f, 1.0f, 0.0f);//purple glColor4f(0.0f, 1.0f, 1.0f, 1.0f);//light blue glColor4f(1.0f, 0.5f, 0.0f, 0.0f);//orange/brown glColor3f(0.0f, 1.0f, 0.0f);//Green glColor3f(0.0f, 0.0f, 1.0f);//Blue glColor3f(0.5f, 1.0f, 1.0f);//cyan glColor3f(0.0f, 0.0f, 0.0f);//Black glColor3f(1.0f, 0.0f, 1.0f);//Purple glColor3f(1.0f, 0.5f, 0.0f);//Orange glColor3f(0.5f, 0.5f, 0.5f);//Violet glColor3f(0.0f, 0.5f, 0.5f);//Blue-Green glColor3f(0.0f, 0.5f, 1.0f);//baby Blue glColor3f(2.0f, 0.5f, 1.0f);//Lilac glColor3f(0.1f, 0.1f, 0.1f);//Dark grey glColor3f(0.1f, 0.0f, 0.1f);//Dark Purple glColor3f(0.1f, 0.1f, 0.0f);//Bronze glColor3f(0.0f, 0.1f, 0.1f);//Dark blue glColor3f(0.0f, 0...
Read more

Objects using Line-Attribute, Fill-Area Attribute, Color functions of OpenGL

1. Load the libraries #include<GL/glut.h> #include<windows.h> 2. Create a display function where you will be drawing your shape and objects void display() { } 3. Give Screen color using ClearColor     glClearColor(0.0,0.1,0.0,0.0);     glClear(GL_COLOR_BUFFER_BIT); 4. Use factor and pattern to give some styles to your line. for more pattern click:  GL_Pattern     GLint factor=1;     GLushort pattern=0x0c0f; 5. Enable the Stipple     glEnable(GL_LINE_STIPPLE); // enabling the line pattern function     glLineStipple(factor,pattern); 6.Draw the shape     glColor3f(1.0,0.0,0.0);     glBegin(GL_LINES);     glVertex2f(0.0,0.0);     glVertex2f(1.0,0.0);     glEnd(); 7.disable the stipple then flush it.     glDisable(GL_LINE_STIPPLE);     glFlush(); 8. Main Function int main(int argc,char** argv) 9.  Ii...
Read more

OpenGL Texture

#include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> #include <stdlib.h> #include <stdio.h> /*  Create checkerboard texture  */ #define checkImageWidth 64 #define checkImageHeight 64 static GLubyte checkImage[checkImageHeight][checkImageWidth][4]; static GLuint texName; GLfloat _angle=45; void makeCheckImage(void) {    int i, j, c;    for (i = 0; i < checkImageHeight; i++) {       for (j = 0; j < checkImageWidth; j++) {          //c = ((((i&0x8)==0)^((j&0x8))==0))*255; //checks         // c=((((i&0X15)==0)^((j&0x15))==0))*120;//border         //c=((((i&0X2)==0)^((j&0x2))==0))*200; //more checks          c=((((i&0x22)==0)^((j&0x22))==0))*200; //flag          checkImage[i][j][0] = (GLubyte) c;          checkIm...
Read more