mirror of https://github.com/cc65/cc65.git
180 lines
3.8 KiB
C
180 lines
3.8 KiB
C
/* Tgidemo modified for the Atari Lynx.
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**
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** Press any of the Lynx's option buttons to go to the next screen.
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*/
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#include <cc65.h>
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#include <conio.h>
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#include <tgi.h>
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#include <time.h>
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#define COLOR_BACK TGI_COLOR_BLACK
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#define COLOR_FORE TGI_COLOR_WHITE
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Driver stuff */
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static unsigned MaxX;
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static unsigned MaxY;
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static unsigned AspectRatio;
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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/* The Lynx draws too fast. This function delays
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** the drawing so that we can watch it.
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*/
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static void wait (unsigned char ticks)
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{
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clock_t T = clock () + ticks;
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while (clock () < T) {}
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}
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static void DoCircles (void)
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{
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unsigned char I;
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unsigned char Color = COLOR_BACK;
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const unsigned X = MaxX / 2;
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const unsigned Y = MaxY / 2;
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const unsigned Limit = (X < Y) ? Y : X;
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tgi_setcolor (COLOR_FORE);
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tgi_clear ();
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tgi_line (0, 0, MaxX, MaxY);
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tgi_line (0, MaxY, MaxX, 0);
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while (!kbhit ()) {
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Color = (Color == COLOR_FORE) ? COLOR_BACK : COLOR_FORE;
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tgi_setcolor (Color);
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for (I = 10; I <= Limit; I += 10) {
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tgi_ellipse (X, Y, I, tgi_imulround (I, AspectRatio));
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wait (9);
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}
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}
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cgetc ();
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}
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static void DoCheckerboard (void)
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{
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unsigned X, Y;
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unsigned char Color = COLOR_BACK;
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tgi_clear ();
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while (1) {
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for (Y = 0; Y <= MaxY - 2; Y += 10) {
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for (X = 0; X <= MaxX; X += 10) {
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Color = (Color == COLOR_FORE) ? COLOR_BACK : COLOR_FORE;
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tgi_setcolor (Color);
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tgi_bar (X, Y, X+9, Y+9);
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if (kbhit ()) {
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cgetc ();
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return;
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}
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wait (1);
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}
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Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
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}
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Color = Color == COLOR_FORE ? COLOR_BACK : COLOR_FORE;
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}
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}
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static void DoDiagram (void)
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{
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int XOrigin, YOrigin;
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int Amp;
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int X, Y;
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unsigned I;
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tgi_setcolor (COLOR_FORE);
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tgi_clear ();
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/* Determine zero and amplitude */
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YOrigin = MaxY / 2;
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XOrigin = 10;
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Amp = (MaxY - 19) / 2;
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/* Y axis */
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tgi_line (XOrigin, 10, XOrigin, MaxY-10);
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tgi_line (XOrigin-2, 12, XOrigin, 10);
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tgi_lineto (XOrigin+2, 12);
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/* X axis */
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tgi_line (XOrigin, YOrigin, MaxX-10, YOrigin);
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tgi_line (MaxX-12, YOrigin-2, MaxX-10, YOrigin);
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tgi_lineto (MaxX-12, YOrigin+2);
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/* Sine */
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tgi_gotoxy (XOrigin, YOrigin);
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for (I = 0; I <= 360; ++I) {
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/* Calculate the next points */
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X = (int)(((long)(MaxX - 19) * I) / 360);
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Y = (int)(((long)Amp * -_sin (I)) / 256);
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/* Draw the line */
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tgi_lineto (XOrigin + X, YOrigin + Y);
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}
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cgetc ();
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}
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static void DoLines (void)
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{
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unsigned X;
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const unsigned Min = (MaxX < MaxY) ? MaxX : MaxY;
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tgi_setcolor (COLOR_FORE);
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tgi_clear ();
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for (X = 0; X <= Min; X += 10) {
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tgi_line (0, 0, Min, X);
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tgi_line (0, 0, X, Min);
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tgi_line (Min, Min, 0, Min-X);
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tgi_line (Min, Min, Min-X, 0);
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wait (9);
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}
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cgetc ();
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}
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void main (void)
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{
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/* Install the driver */
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tgi_install (tgi_static_stddrv);
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tgi_init ();
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/* Get stuff from the driver */
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MaxX = tgi_getmaxx ();
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MaxY = tgi_getmaxy ();
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AspectRatio = tgi_getaspectratio ();
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/* Do graphics stuff */
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DoCircles ();
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DoCheckerboard ();
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DoDiagram ();
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DoLines ();
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}
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