drawLine

[GoogleCodeExporter]

add a (x0,y0,x1,y1) line draw procedure
(takover from dogm128 lib)

Original issue reported on code.google.com by olikr...@gmail.com on 19 Mar 2012 at 5:26

[GoogleCodeExporter]

here is my procedure from dogm128 lib:

void dog_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t size)
{
  uint8_t tmp;
  uint8_t x,y;
  uint8_t dx, dy;
  signed char err;
  uint8_t swapxy = 0;
  signed char ystep;
  if ( x1 > x2 ) dx = x1-x2; else dx = x2-x1;
  if ( y1 > y2 ) dy = y1-y2; else dy = y2-y1;
  if ( dy > dx ) 
  {
    swapxy = 1;
    tmp = dx; dx =dy; dy = tmp;
    tmp = x1; x1 =y1; y1 = tmp;
    tmp = x2; x2 =y2; y2 = tmp;
  }
  if ( x1 > x2 ) 
  {
    tmp = x1; x1 =x2; x2 = tmp;
    tmp = y1; y1 =y2; y2 = tmp;
  }
  err = dx >> 1;
  if ( y2 > y1 ) ystep = 1; else ystep = -1;
  y = y1;
  for( x = x1; x <= x2; x++ )
 {
   if ( swapxy == 0 ) 
     dog_DrawPoint(x,y,size); 
   else 
     dog_DrawPoint(y,x,size);
   err -= (uint8_t)dy;
   if ( err < 0 ) 
   {
     y += (uint8_t)ystep;
     err += (uint8_t)dx;
   }
 }  
}

Original comment by olikr...@gmail.com on 25 Mar 2012 at 9:13

[GoogleCodeExporter]

done

Original comment by olikr...@gmail.com on 25 Mar 2012 at 7:22

• Changed state: Fixed