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Chess Board in OpenGL Computer graphics

How to draw a simple Chess Board in OpenGL Computer graphics full descriptive along with code.

Chess board consist of the Black and White boxes with each follows other alternatively. Let build a chess board with computer graphics using OpenGL platform.



First draw the black and the white strips for the board with the  draw_BlackArea()  and draw_whiteArea() functions. In the functions GL_QUADS is used to form the rectangular shape, while rest is easily understood in the following code. The 6 blocks of GL_QUADS is used as for each faces in the cube.


void draw_BlackArea()
{

glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(1.50f,0.0f,0.0f);
glVertex3f(1.5f,0.3f,0.0f);
glVertex3f(0.0f,0.3f,0.0f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(0.0f,0.0f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,0.0f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(1.5f,0.0f,0.0f);
glVertex3f(1.5f,0.0f,-1.5f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(1.5f,0.3f,0.0f);
glEnd();

glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,-1.5f);
glVertex3f(1.50f,0.0f,-1.5f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(1.50f,0.0f,0.0f);
glVertex3f(1.5f,0.0f,-1.5f);
glVertex3f(0.0f,0.0f,-1.5f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.0f,0.0f,0.0f);
glVertex3f(0.0f,0.3f,0.0f);
glVertex3f(1.50f,0.3f,0.0f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glEnd();

}
void draw_whiteArea()
{

glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(1.50f,0.0f,0.0f);
glVertex3f(1.5f,0.3f,0.0f);
glVertex3f(0.0f,0.3f,0.0f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(0.0f,0.0f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,0.0f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(1.5f,0.0f,0.0f);
glVertex3f(1.5f,0.0f,-1.5f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(1.5f,0.3f,0.0f);
glEnd();

glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,-1.5f);
glVertex3f(1.50f,0.0f,-1.5f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glEnd();


glBegin(GL_QUADS);
glColor3f(0.05f,0.05f,0.05f);
glVertex3f(0.0f,0.0f,0.0f);
glVertex3f(1.50f,0.0f,0.0f);
glVertex3f(1.5f,0.0f,-1.5f);
glVertex3f(0.0f,0.0f,-1.5f);
glEnd();


glBegin(GL_QUADS);
glColor3f(1.0f,1.0f,1.0f);
glVertex3f(0.0f,0.3f,0.0f);
glVertex3f(1.50f,0.3f,0.0f);
glVertex3f(1.5f,0.3f,-1.5f);
glVertex3f(0.0f,0.3f,-1.5f);
glEnd();

}


Next is to render the objects that has been drawn. To have this declare the initRendering() function which not the usual init() function make the note of it. GL_COLOR_MATERIAL has been enabled for materializing the cube look for the board. The list will make room for the display list show that the white and black boards are displayed. Before that list need to be declared -


GLuint _displayListId_blackArea;
GLuint _displayListId_whiteArea;

Now this list will get called in the following code.



void initRendering()
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_COLOR_MATERIAL);
glClearColor(0.0f,0.0f,0.2f,1.0f);
//Set up a display list for drawing a cube
_displayListId_blackArea = glGenLists(1); //Make room for the display list
glNewList(_displayListId_blackArea, GL_COMPILE); //Begin the display list
draw_BlackArea(); //Add commands for drawing a black area to the display list
glEndList(); //End the display list

//Set up a display list for drawing a cube
_displayListId_whiteArea = glGenLists(2); //Make room for the display list
glNewList(_displayListId_whiteArea, GL_COMPILE); //Begin the display list
draw_whiteArea(); //Add commands for drawing a black to the display list
glEndList(); //End the display list
}

Now call all the functions that need to display  in the function drawScene() where all object will be called the boards indivual box will form the whole chess of 8X8 game board.

void drawScene()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
//glRotatef(-_angle, 0.0f, 1.0f, 0.0f);
glTranslatef(-4*1.5, 0.0, 4*1.5);

for(float j=0.0;j>(-8*1.5);j-=1.5)
{
k++;
for(i=0.0;i<(4*3.0);i+=3.0)
{
if(k%2==0)
{
glPushMatrix();
glTranslatef(i,0.0,j);
glCallList(_displayListId_blackArea);
glPopMatrix();

}
else
{
glPushMatrix();
glTranslatef(i+1.5,0.0,j);
glCallList(_displayListId_blackArea);
glPopMatrix();

}
}
}
for(j=0.0;j>(-8*1.5);j-=1.5)
{
k++;
for(i=0.0;i<(4*3.0);i+=3.0)
{
if(k%2!=0)
{
glPushMatrix();
glTranslatef(i,0.0,j);
glCallList(_displayListId_whiteArea);
glPopMatrix();

}
else
{
glPushMatrix();
glTranslatef(i+1.5,0.0,j);
glCallList(_displayListId_whiteArea);
glPopMatrix();

}
}
}
glutSwapBuffers();
}



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OpenGL Projects: Chess Board in OpenGL Computer graphics
Chess Board in OpenGL Computer graphics
How to draw a simple Chess Board in OpenGL Computer graphics full descriptive along with code.
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http://3.bp.blogspot.com/-50IRanPgC5g/USN5jljY2OI/AAAAAAAAEVc/poGzz3hZl7U/s72-c/chess+board.JPG
OpenGL Projects
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