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#include <stdio.h>
#include <stdlib.h>
#include <cc65.h>
#include <conio.h>
#include <ctype.h>
#include <modload.h>
#include <tgi.h>
#ifndef DYN_DRV
# define DYN_DRV 1
#endif
#define COLOR_BACK TGI_COLOR_BLACK
#define COLOR_FORE TGI_COLOR_WHITE
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Driver stuff */
static unsigned MaxX;
static unsigned MaxY;
static unsigned AspectRatio;
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static void CheckError (const char* S)
{
unsigned char Error = tgi_geterror ();
if (Error != TGI_ERR_OK) {
printf ("%s: %d\n", S, Error);
if (doesclrscrafterexit ()) {
cgetc ();
}
exit (EXIT_FAILURE);
}
}
#if DYN_DRV
static void DoWarning (void)
/* Warn the user that the dynamic TGI driver is needed for this program */
{
printf ("Warning: This program needs the TGI\n"
"driver on disk! Press 'y' if you have\n"
"it - any other key exits.\n");
if (tolower (cgetc ()) != 'y') {
exit (EXIT_SUCCESS);
}
printf ("OK. Please wait patiently...\n");
}
#endif
static void DoCircles (void)
{
static const unsigned char Palette[2] = { TGI_COLOR_WHITE, TGI_COLOR_ORANGE };
unsigned char I;
unsigned char Color = COLOR_FORE;
unsigned X = MaxX / 2;
unsigned Y = MaxY / 2;
tgi_setpalette (Palette);
while (!kbhit ()) {
tgi_setcolor (COLOR_FORE);
tgi_line (0, 0, MaxX, MaxY);
tgi_line (0, MaxY, MaxX, 0);
tgi_setcolor (Color);
for (I = 10; I < 240; I += 10) {
tgi_ellipse (X, Y, I, tgi_imulround (I, AspectRatio));
}
Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
}
cgetc ();
tgi_clear ();
}
static void DoCheckerboard (void)
{
static const unsigned char Palette[2] = { TGI_COLOR_WHITE, TGI_COLOR_BLACK };
unsigned X, Y;
unsigned char Color;
tgi_setpalette (Palette);
Color = COLOR_BACK;
while (1) {
for (Y = 0; Y <= MaxY; Y += 10) {
for (X = 0; X <= MaxX; X += 10) {
tgi_setcolor (Color);
tgi_bar (X, Y, X+9, Y+9);
Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
if (kbhit ()) {
cgetc ();
tgi_clear ();
return;
}
}
Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
}
Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
}
}
static void DoDiagram (void)
{
static const unsigned char Palette[2] = { TGI_COLOR_WHITE, TGI_COLOR_BLACK };
int XOrigin, YOrigin;
int Amp;
int X, Y;
unsigned I;
tgi_setpalette (Palette);
tgi_setcolor (COLOR_FORE);
/* Determine zero and aplitude */
YOrigin = MaxY / 2;
XOrigin = 10;
Amp = (MaxY - 19) / 2;
/* Y axis */
tgi_line (XOrigin, 10, XOrigin, MaxY-10);
tgi_line (XOrigin-2, 12, XOrigin, 10);
tgi_lineto (XOrigin+2, 12);
/* X axis */
tgi_line (XOrigin, YOrigin, MaxX-10, YOrigin);
tgi_line (MaxX-12, YOrigin-2, MaxX-10, YOrigin);
tgi_lineto (MaxX-12, YOrigin+2);
/* Sine */
tgi_gotoxy (XOrigin, YOrigin);
for (I = 0; I <= 360; I += 5) {
/* Calculate the next points */
X = (int) (((long) (MaxX - 19) * I) / 360);
Y = (int) (((long) Amp * -_sin (I)) / 256);
/* Draw the line */
tgi_lineto (XOrigin + X, YOrigin + Y);
}
cgetc ();
tgi_clear ();
}
static void DoLines (void)
{
static const unsigned char Palette[2] = { TGI_COLOR_WHITE, TGI_COLOR_BLACK };
unsigned X;
tgi_setpalette (Palette);
tgi_setcolor (COLOR_FORE);
for (X = 0; X <= MaxY; X += 10) {
tgi_line (0, 0, MaxY, X);
tgi_line (0, 0, X, MaxY);
tgi_line (MaxY, MaxY, 0, MaxY-X);
tgi_line (MaxY, MaxY, MaxY-X, 0);
}
cgetc ();
tgi_clear ();
}
int main (void)
{
unsigned char Border;
#if DYN_DRV
/* Warn the user that the tgi driver is needed */
DoWarning ();
/* Load and initialize the driver */
tgi_load_driver (tgi_stddrv);
CheckError ("tgi_load_driver");
#else
/* Install the driver */
tgi_install (tgi_static_stddrv);
CheckError ("tgi_install");
#endif
tgi_init ();
CheckError ("tgi_init");
tgi_clear ();
/* Get stuff from the driver */
MaxX = tgi_getmaxx ();
MaxY = tgi_getmaxy ();
AspectRatio = tgi_getaspectratio ();
/* Set the palette, set the border color */
Border = bordercolor (COLOR_BLACK);
/* Do graphics stuff */
DoCircles ();
DoCheckerboard ();
DoDiagram ();
DoLines ();
#if DYN_DRV
/* Unload the driver */
tgi_unload ();
#else
/* Uninstall the driver */
tgi_uninstall ();
#endif
/* Reset the border */
(void) bordercolor (Border);
/* Done */
printf ("Done\n");
return EXIT_SUCCESS;
}
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