Line Algorithm
Author
I''m a newb. I read this somewhere but didn''t write it down. What''s the line drawing algorithm? it should be a function that takes X and Y args
thanks
Newbie to game programming?
visit
KaBooMgames
Great for Newbs, Masters welcome as well
This works if the slope is greater than 0 and less than 1, it''s normally known as Bresenham''s Line-Drawing Algorithm:
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void Line(int xa, int ya, int xb, int yb) { int dx = abs(xa-xb), dy = abs(ya-yb); int p = 2*dy-dx; int twoDy = 2*dy, twoDyDx = 2*(dy-dx); int x, y, xEnd; if(xa > xb) { x = xb; y = yb; xEnd = xa; } else { x = xa; y = ya; xEnd = yb; } SetPixel(x,y); while(x < xEnd) { x++; if(p<0) p += twoDy; else { y++; p += twoDyDx; } SetPixel(x,y); }} [/source]
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Author
[pre]void line(float x1, float y1, float x2, float y2){ double hl=fabs(x2-x1); double vl=fabs(y2-y1); double length=hl; float deltax=(x2-x1)/(float)length; float deltay=(y2-y1)/(float)length; if (hl < vl) length = vl; for (int i=0; i<(int)length; i++) { unsigned long x=(int)(x1+=deltax); unsigned long y=(int)(y1+=deltay); if ((x<640)&&(y<480)) SetPixel(x,y); }} [/pre] This topic is closed to new replies.
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