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erdelf
erdelf wrote ...

2012/9/11

Convert coordinates

erdelf erdelf

2012/9/11

#
I have this grid: I want to convert coordinates in this grid in greenfoot coordinates, the size of the world is 650 * 450. It needs to work with negative and positive values, I tried a few things but it doesn't seems to work
danpost danpost

2012/9/11

# 
// grid point (0, 0) is at greenfoot coordinate (originX, originY)
int originX = 450;
int originY = 400;
// let us get a random point on the grid (gridX, gridY)
int gridX = Greenfoot.getRandomNumber(650) - originX;
int gridY = originY - getHeight() + Greenfoot.getRandomNumber(450);
// now, covert to greenfoot coordinates (gfX, gfY)
int gfX = originX + gridX;
int gfY = originY - gridY;
erdelf erdelf

2012/9/13

#
thx, seems to work so far
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