textrotate - marinus-lab/z88dk GitHub Wiki

{{:examples:snippets:zxspectrum:textrotate.gif|}}

To build it for a Spectrum: zcc +zx -create-app -lndos -lm rotate.c

  • or - zcc +zx -create-app -lndos -lmzx_tiny rotate.c

To build it for a ZX81: zcc +zx81 -startup=3 -lgfx81hr192 -create-app -lm rotate.c

#include `<stdio.h>`
#include `<math.h>`
#include `<graphics.h>`
#include `<string.h>`

// Set the font location here.

#ifdef __SPECTRUM__
#define FONT 15360
#endif

#ifdef __ZX81__
#define FONT 7680
#endif


float s,g,e;
int a,b,c,d;
unsigned char p,q;

void rotate_text(int width, int height, int x, int y, int angle, char *text)
{
 x+=width*7; y+=height*8;
 g=angle/180.0*pi();
 s=sin(g); g=cos(g);
 a=0;
 
#ifdef __ZX81__
 text=strlwr(text);
#endif
 
 while (text[a]!=0) {
#ifdef __ZX81__
   b=FONT+ascii_zx(text[a])*8+7;
#else
   b=FONT+text[a]*8+7;
#endif
   for (c=6;c>0;c--) {
     p=*(b-c);
     for (d=0;d<7;d++) {
       q=p/2;
       if (p&1)
         for (e=0.0;e<(0.0+height);e+=0.4) {
           plot(x+(c*height+e)*s-d*width*g,y-(c*height+e)*g-d*width*s);
           drawr((1.2-width)*g,(1.2-width)*s);
         }
       p=q;
     }
   }
   x=x+g*width*8.0;
   y=y+s*width*8.0-g*width;
   
   a++;
 }
}


void main()
{
	clg();
	rotate_text(3, 5, 0, 0, 38, "Hello World!");
}
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