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Refactored the TGI demo.

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Cleared the screen at the beginning of each demo instead of at the end.  Setting the colors before clearing makes it more reliable and consistent across platforms.
This commit is contained in:
Greg King 2020-06-05 13:37:20 -04:00
parent 7b2e4d0c7f
commit 8b5ae001e5
1 changed files with 13 additions and 13 deletions
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26
samples/tgidemo.c
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@ -38,8 +38,9 @@ static unsigned AspectRatio;
static void CheckError (const char* S)
{
unsigned char Error = tgi_geterror ();
if (Error != TGI_ERR_OK) {
printf ("%s: %d\n", S, Error);
printf ("%s: %u\n", S, Error);
if (doesclrscrafterexit ()) {
cgetc ();
}
@ -74,19 +75,19 @@ static void DoCircles (void)
unsigned Y = MaxY / 2;
tgi_setpalette (Palette);
tgi_setcolor (COLOR_FORE);
tgi_clear ();
tgi_line (0, 0, MaxX, MaxY);
tgi_line (0, MaxY, MaxX, 0);
while (!kbhit ()) {
tgi_setcolor (COLOR_FORE);
tgi_line (0, 0, MaxX, MaxY);
tgi_line (0, MaxY, MaxX, 0);
Color = (Color == COLOR_FORE) ? COLOR_BACK : COLOR_FORE;
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 ();
}
@ -95,19 +96,19 @@ static void DoCheckerboard (void)
{
static const unsigned char Palette[2] = { TGI_COLOR_WHITE, TGI_COLOR_BLACK };
unsigned X, Y;
unsigned char Color;
unsigned char Color = COLOR_BACK;
tgi_setpalette (Palette);
Color = COLOR_BACK;
tgi_clear ();
while (1) {
for (Y = 0; Y <= MaxY; Y += 10) {
for (X = 0; X <= MaxX; X += 10) {
Color = (Color == COLOR_FORE) ? COLOR_BACK : COLOR_FORE;
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;
}
}
@ -129,6 +130,7 @@ static void DoDiagram (void)
tgi_setpalette (Palette);
tgi_setcolor (COLOR_FORE);
tgi_clear ();
/* Determine zero and aplitude */
YOrigin = MaxY / 2;
@ -158,7 +160,6 @@ static void DoDiagram (void)
}
cgetc ();
tgi_clear ();
}
@ -170,6 +171,7 @@ static void DoLines (void)
tgi_setpalette (Palette);
tgi_setcolor (COLOR_FORE);
tgi_clear ();
for (X = 0; X <= MaxY; X += 10) {
tgi_line (0, 0, MaxY, X);
@ -179,7 +181,6 @@ static void DoLines (void)
}
cgetc ();
tgi_clear ();
}
@ -203,7 +204,6 @@ int main (void)
tgi_init ();
CheckError ("tgi_init");
tgi_clear ();
/* Get stuff from the driver */
MaxX = tgi_getmaxx ();