Use glRecti() function

Use glRecti() function:

glRecti function is use in opengl for draw rectangle. it optimize our code. in our previous lecture we draw a rectangle by using GL_QUADS function. in which we use four vertices . but in glrecti() function we only use two vertices. so we simply say that abut glRecti() function

Defination:

opposite corners  filled with current color. by using glRecti() function we can also draw the aligned rectangles. it mean  later rectangles are drawn on top of previous ones.

Syntax:

                           glRecti (int x1,       int y1,     int x2,    int y2);
Note:
             Main function is glRect we use 'i' for integer value for float value we use 'f' .
here x1 and y1 are the vertex of  first corner and x2 and y2 are the vertex of  second corner.

code:

in glutDisplayFunc() we call a function draw_rect function for example glutDisplayFunc(draw_rect)

so that 

void draw_rect(void)

{

glColor3f( 1.0, 0.0, 0.0);

glRecti(100,100,250, 250); 

glColor3f( 0.0, 1.0, 0.0);

glRecti(240,240,350, 350); 

    glFlush();

}

screen short:

 source code:                                                               

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