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Plot 2d data

Started by Zdravko Jul 30, 2007 at 9:38 AM 0 replies 1k views

Original Post

Jul 30, 2007 at 9:38 AM

Hi there! I would like to draw several points (packed in an array pair)in a 2d cartesian coordinate system (let's say 1000x1000 units) drawn in a window with fixed size (let's say 640x480) - only in the 1st quadrant. What is the OpenGl initialization and drawing code for this? Thanks in advance!

falkone

Jul 30, 2007 at 10:01 PM

Use something like this.

glViewport(0,0,640,480);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0,1000,0,1000);

If you want it to take only the upper-left quarter of the screen you can use

glViewport(0,0,320,240);

if you want to draw points, just iterate through the array and use GL_POINTS

  glBegin(GL_POINTS);        glVertex3f(point.x, point.y); // x and y : 0-1000  glEnd();

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