Opengl-Generating random points in a specific range

Question

I want to generate random points in a specific range for an opengl program, say points between the coordinates Xmin=200, Xmax = 400 and Ymin= 200 , Ymax = 400.

Actually I am trying to simulate a volcanic eruption in 2D using simple C code and without using any textures(I cannot use textures in my project). PS: I Have very basic knowledge about opengl, just a beginner.

Thanks.

I need help generating random points in the range. If I use Rand()%400 I get points from coordinates 0 to 400 but I need them to start from coordinate 200. — dabreo, Apr 28 '16 at 13:25

score 2 · Accepted Answer · answered Apr 28 '16 at 13:29

2

To generate randomly distributed points in a range [min, max] one can use the following formula:

(rand() % (max- min)) + min

The first part generates random numbers in the range [0, max-min] which are then shifted to [min, max] by adding min to it.

answered Apr 28 '16 at 13:29

BDL

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score 1 · Answer 2 · answered Apr 28 '16 at 13:29

1

Generate random from 0 to 200 and then shift: Rand()%201+200

answered Apr 28 '16 at 13:29

Vasfed

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Thanks for the answer. – dabreo Apr 28 '16 at 13:44

Opengl-Generating random points in a specific range

2 Answers2