Re: C++ src for drawing graphics

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#253

From: Mark
Date: Fri, 03 Aug 2001 17:56

46 lines
2335 bytes

The Palm API includes functions for drawing rectangles, lines, & pixels.
Here's some code for circle drawing (modified Bresenham algorithm).

void DrawCircle( int xc, int yc, int r)
{
 int x = 0;
 int y = r;
 int p = 3 - 2 * r;

 while (x <= y)
 {
  WinDrawPixel(xc + x, yc + y);
  WinDrawPixel(xc - x, yc + y);

  WinDrawPixel(xc + x, yc - y);
  WinDrawPixel(xc - x, yc - y);

  WinDrawPixel(xc + y, yc + x);
  WinDrawPixel(xc - y, yc + x);

  WinDrawPixel(xc + y, yc - x);
  WinDrawPixel(xc - y, yc - x);

  if (p < 0)
   p += 4 * x++ + 6;
  else
   p += 4 * (x++ - y--) + 10;
 }
 }

"Kevin Wittmer" <kwittmer@sprintmail.com> wrote in message
news:Kf877.11747$Xn.1411793@newsread1.prod.itd.earthlink.net...
> Hello,
>
> Please reply back to this new postings if you know a good source on the
web
> for sample C++ CodeWarrior/Palm source code projects that demonstrate how
to
> draw simple graphics such as lines and circles on a Palm PDA.
>
> Thanks in advance,
>
>    Kevin
>
>
>

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