Source Code Drawing In OpenGL

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Solaire

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Dec 15, 2013
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Update do these videos:

I thought I'd post how to draw in OpenGL since I recently learned. It's really easy once you get it down, and can be really fun! This tutorial assumes you have a wrapper or hook.

Let's start with simply drawing a dot. Why's that useful, you ask? Radars, circles, whatever your mind imagines, you've got it!

C++:
// This is the size of our point.
glPointSize(4);
// This is the color of our point, and in this case it's red
glColor3f(1.0f, 0.0f, 0.0f);

//This is where our drawing starts. We are using GL_POINTS since we want to draw
//... well, Points!
glBegin(GL_POINTS);
// This is the position that we draw the point at.
//Just a quick note, x increases towards the right, and decreases to the left
//Y increases the further down you go, and decreases the further up you go
glVertex2f(DrawX, DrawY);
//End our drawing
glEnd();
Pretty simple :)

Now, for drawing a line, we replace GL_POINTS with GL_LINES.

C++:
//This sets the lines width when drawing
glLineWidth(1.0);

//Start drawing our lines
glBegin(GL_LINES);
//These will create a simple Plus symbol
glVertex2f(110, 10);
glVertex2f(110, 210);

glVertex2f(10,110);
glVertex2f(210, 110);
glEnd();
We have lines, and we have dots. How do we draw shapes??

EASILY!!

C++:
glBegin(GL_POLYGON);
glVertex2f(10, 10);
glVertex2f(210, 10);
glVertex2f(210, 210);
glVertex2f(10, 210);
glEnd();
This draws a simple box. For better understanding, look up these functions, as they're all very well documented. If you combine all of these, you can create a radar! Here's a simple start for the radar. You just have to draw the entity dots yourself:

C++:
const float InnerEdge = 10;
const float Center = 110;
const float OuterEdge = 210;

glPointSize(4);
glColor3f(1.0f, 0.0f, 0.0f);

//Draw the dot in the center (Our player)
glBegin(GL_POINTS);
glVertex2f(Center, Center);
glEnd();

glColor3f(1.0f, 1.0f, 1.0f);
glLineWidth(1.0);

//Draw the Plus symbol (Mostly for looks and orientation)
glBegin(GL_LINES);
glVertex2f(Center, InnerEdge);
glVertex2f(Center, OuterEdge);

glVertex2f(InnerEdge, Center);
glVertex2f(OuterEdge, Center);
glEnd();

glColor3f(0.2f, 0.2f, 0.2f);

//Draw the radar box
glBegin(GL_POLYGON);
glVertex2f(InnerEdge, InnerEdge);
glVertex2f(OuterEdge, InnerEdge);
glVertex2f(OuterEdge, OuterEdge);
glVertex2f(InnerEdge, OuterEdge);
glEnd();
Just a quick note, when drawing in OpenGL, the first thing you draw is on top (The dot), and the last thing you draw is on the bottom (The radar box).

Happy hacking,
Krampus :)
 
Last edited by a moderator:

c5

Kim Kong Trasher
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Sweet, you don't need a wrapper however, just hook wglSwapBuffers for example.
 

Rake

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Very cool Krampus hella nice work!
 
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