dos33fsprogs/utils/gr-sim/rotate_wipe/rotate_rotolookup.c
2021-01-06 14:00:59 -05:00

123 lines
1.8 KiB
C

/* based roughly on code from https://www.ocf.berkeley.edu/~horie/qbrotate.html */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "gr-sim.h"
#include "tfv_utils.h"
#include "tfv_zp.h"
#include "demo_title.c"
#define PI 3.14159265358979323946264
int main(int argc, char **argv) {
int xx,yy,ch,color;
double ca,sa,cca,csa;
double theta=0;
int frame=0;
double scale=1.0;
double yca,ysa,xp,yp;
int xcenter=20,ycenter=20;
grsim_init();
gr();
// clear_screens();
ram[DRAW_PAGE]=PAGE0;
clear_bottom();
ram[DRAW_PAGE]=PAGE1;
clear_bottom();
ram[DRAW_PAGE]=PAGE2;
clear_bottom();
// clear_bottom(PAGE0);
// clear_bottom(PAGE1);
// clear_bottom(PAGE2);
// grsim_unrle(demo_rle,0x400);
grsim_unrle(demo_rle,0xc00);
// gr_copy_to_current(0xc00);
// page_flip();
// gr_copy_to_current(0xc00);
// page_flip();
ram[DRAW_PAGE]=PAGE0;
while(1) {
grsim_update();
blah:
ch=grsim_input();
if (ch=='q') break;
if (ch==0) goto blah;
ca = cos(theta)*scale;
sa = sin(theta)*scale;
cca = -20*ca;
csa = -20*sa;
yca=cca+ycenter;
ysa=csa+xcenter;
for(yy=0;yy<40;yy++) {
xp=cca+ysa;
yp=yca-csa;
for(xx=0;xx<40;xx++) {
if ((xp<0) || (xp>39)) color=0;
else if ((yp<0) || (yp>39)) color=0;
else {
color=scrn_page(xp,yp,PAGE2);
}
if (
((xx==0) && (yy==0)) ||
((xx==20) && (yy==20)) ||
((xx==39) && (yy==39))
) {
printf("%d,%d -> %0.2lf,%0.2lf\n",xx,yy,xp,yp);
}
color_equals(color);
plot(xx,yy);
xp=xp+ca;
yp=yp-sa;
}
yca+=ca;
ysa+=sa;
}
theta+=(PI/8.0);
scale-=0.008;
usleep(30000);
frame++;
/* reset */
if (frame==128) {
sleep(1);
theta=0;
scale=1.0;
frame=0;
}
}
return 0;
}