Creating a Train in Computer graphics is not that much hard but logical. In this post we are going to see an OpenGL Projects Example on trains. Our objective is to develop a simple cg projects for running train. Here we need to draw the following things -
- Train - the bogies and the engine
- Train Tracks
- Sky with surrounds (Environment)
After we finish the drawing our next aim would be to give motion to the train. As we are going to draw a simple train so our track will be a straight not in zigzag manner.
Design and Implementation
For developing the train - it's bogies and engine we have defined a simple function. In this simple opengl projects example we are coding this function so we can make any no trains, by just calling it. The following is sample code for drawing train -
void TRAINS(int x1,int y1,int a,int b)
{
int i=0;
glBegin(GL_QUADS);
glColor3f(0,0.0,1.0); //ENGINE
glVertex2f(x1,y1); //lengh of engine=60;height of engine=30;
glColor3f(0,0.0,1.0);
glVertex2f(x1+60,y1);
glColor3f(1.0,0.0,0.0);
glVertex2f(x1+60,y1-30);
glColor3f(0,0.0,0.0);
glVertex2f(x1,y1-30);
glEnd();
while(i<3)
{
glBegin(GL_QUADS); //BOGIES
glColor3f(1.0,0.0,0.0); //For right train a=795,b=510
glVertex2f(a,b);
glColor3f(1.0,0.0,0.0);
glVertex2f(a+60,b);
glColor3f(1.0,0.0,0.0);
glVertex2f(a+60,b-20);
glColor3f(1.0,0.0,0.0);
glVertex2f(a,b-20);
glEnd();
a+=65;
i++;
}
}
This function can be called any where hence easy to create the sample trains. In similar fashion we have different functions for Sky, Environments and Tracks. You can download the free cg source code below. All the things made in the opengl projects example have used primitive opengl objects.
Next level of difficulty is to move the whole Train - bogies and engine. For the motion of train we have logically used the call-list, push-pop matrix and the most important Clock() function. The clock() is defined in <time.h> header so you need to include it as well in the project.
clock_t goal = mseconds + clock();
while (goal > clock());
Our new function will help the train runs according a time level else we may go so fast or so slow. We have fixed a goal and add certain time for it to move the objects. The above code is called in a function and we give the parameter mseconds according to our requirement of speed we want.
That's all we finished the things up. I have just summarised the Running Train Opengl Projects Example while you can easily understand the things when you start running the program.
You can improve Opengl Projects Example
How you can improve the running train projects -
- Make the trains more attractive with your creative mind.
- Add smokes coming from the engines while it runs
- Use Keyword or Mouse function to make it more interactive for start, stop and other functions
Download free cg source code
