[palito-dev] primitive alright!

[Michael Devey]

yikes!

Have you ever seen anything as ugly as my additions to flush code?  I 
don't ever remember it being that hideous! Anyway I shall attempt to 
make ammends, given time. Here's a start.

Looks like I'm over trying to get lower levels to do arcs for us, so 
lets go mad with trig functions and waste our time drawing them with 
lines ... :/

I think you can add this blindly but I would appreciate someone who 
knows what they're doing to add flush_lod to the vertices calculation.

Oh, would it be nicer to define a constant such that its (SEGMENTS+1) / 
(2pi) ?
(paranoid about clean :)

myke
kill that code it's embarrassing!

*flush.h
void flush2d_semicircle(float x, float y, float r, float startR, float 
sweepR);
void flush2d_closedsemicircle(float x, float y, float r, float startR, 
float sweepR);
void flush2d_xsemicircle(int closed, float x, float y, float r, float 
startR, float sweepR);

*toodee.c
//-----------------------------------------------------------------------------
#define MAGICMYKE_PACMAN 2
#define MAGICMYKE_GHOST 0
#define MAGICMYKE_21_div_2pi 3.342253805
/*
* Draw a closed/notclosed Circular Arc out of lines given:
* centre x y, radius r, starting angle (radians) startR,
* and arc length (radians) sweepR.
*/
//---
void flush2d_semicircle(float x, float y, float r, float startR, float 
sweepR)
{
   flush2d_xsemicircle( MAGICMYKE_GHOST, x, y, r, startR, sweepR);
}
//---
void flush2d_closedsemicircle(float x, float y, float r, float startR, 
float sweepR)
{
   flush2d_xsemicircle( MAGICMYKE_PACMAN, x, y, r, startR, sweepR);
}
//---
void flush2d_xsemicircle(int closed, float x, float y, float r, float 
startR, float sweepR)
{
       // int vertices = 21 /* 20 lines at 2pi */
   /*   
           (vertices-1) line segments, must change for zoom/speed!!!
           flush_lod will do this yes???? FEED ME!!!!
  
           growing arcs is a little jerky but you'll survive :)
           ( or just swap it back to 21 :} )
   */
       int vertices  = (int)(sweepR*MAGICMYKE_21_div_2pi);
       float v[2], v1[2] = { x,  y },  v2[2] = { r, 0 };   
       float radius;
       int *ip, i;
      
       if(!dynbuf((void **) &ipoints, &isize, 
(vertices+closed)*sizeof(int)*2))
           return;
       ip = ipoints;
       sweepR /= vertices-1;
       afim2_mult_vector2(v, sp, v1);
       matrix2_mult_vector2(v1, sp, v2);
       startR += atan2 (v1[1], v1[0]);
       radius = sqrt(v1[0]*v1[0] + v1[1]*v1[1]);
       for(i = 0; i < vertices; i++, startR += sweepR){
           *ip = (int) ( v[0] + radius * cos(startR) );  ip++;
           *ip = (int) ( v[1] + radius * sin(startR) );  ip++;
       }
       if(closed){
           *ip = (int) v[0];  ip++;
           *ip = (int) v[1];  ip++;
           *ip = *ipoints;
           *(ip+1) = *(ipoints+1);
       }
       flush_polyline(ipoints, vertices+closed);   
}   
//-----------------------------------------------------------------------------