From 7b8fbb31da4d349b889ff4a736858267947d3866 Mon Sep 17 00:00:00 2001
From: uz <uz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Fri, 30 Oct 2009 14:03:21 +0000
Subject: [PATCH] Rewrote the sinus display using the new cc65_sin function.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4403 b7a2c559-68d2-44c3-8de9-860c34a00d81
---
 samples/tgidemo.c | 78 +++++++++++++++++++----------------------------
 1 file changed, 31 insertions(+), 47 deletions(-)

diff --git a/samples/tgidemo.c b/samples/tgidemo.c
index e974ca882..92121c9d9 100644
--- a/samples/tgidemo.c
+++ b/samples/tgidemo.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <cc65.h>
 #include <conio.h>
 #include <ctype.h>
 #include <modload.h>
@@ -17,41 +18,6 @@
 
 
 
-static const unsigned char SinusTable[] = {
-    0x64,0x63,0x61,0x5F,0x5D,0x5B,0x59,0x57,0x55,0x54,
-    0x52,0x50,0x4E,0x4C,0x4A,0x49,0x47,0x45,0x43,0x42,
-    0x40,0x3E,0x3C,0x3B,0x39,0x38,0x36,0x34,0x33,0x31,
-    0x30,0x2E,0x2D,0x2B,0x2A,0x28,0x27,0x26,0x24,0x23,
-    0x22,0x20,0x1F,0x1E,0x1D,0x1C,0x1B,0x1A,0x19,0x18,
-    0x17,0x16,0x15,0x14,0x13,0x12,0x12,0x11,0x10,0x10,
-    0x0F,0x0E,0x0E,0x0D,0x0D,0x0C,0x0C,0x0C,0x0B,0x0B,
-    0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,
-    0x0B,0x0B,0x0B,0x0C,0x0C,0x0C,0x0D,0x0D,0x0E,0x0E,
-    0x0F,0x10,0x10,0x11,0x12,0x12,0x13,0x14,0x15,0x16,
-    0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
-    0x22,0x23,0x24,0x26,0x27,0x28,0x2A,0x2B,0x2D,0x2E,
-    0x30,0x31,0x33,0x34,0x36,0x38,0x39,0x3B,0x3C,0x3E,
-    0x40,0x42,0x43,0x45,0x47,0x49,0x4A,0x4C,0x4E,0x50,
-    0x52,0x54,0x55,0x57,0x59,0x5B,0x5D,0x5F,0x61,0x63,
-    0x64,0x65,0x67,0x69,0x6B,0x6D,0x6F,0x71,0x73,0x74,
-    0x76,0x78,0x7A,0x7C,0x7E,0x7F,0x81,0x83,0x85,0x86,
-    0x88,0x8A,0x8C,0x8D,0x8F,0x91,0x92,0x94,0x95,0x97,
-    0x98,0x9A,0x9B,0x9D,0x9E,0xA0,0xA1,0xA2,0xA4,0xA5,
-    0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,
-    0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB6,0xB7,0xB8,0xB8,
-    0xB9,0xBA,0xBA,0xBB,0xBB,0xBC,0xBC,0xBC,0xBD,0xBD,
-    0xBD,0xBD,0xBD,0xBD,0xBD,0xBD,0xBD,0xBD,0xBD,0xBD,
-    0xBD,0xBD,0xBD,0xBC,0xBC,0xBC,0xBB,0xBB,0xBA,0xBA,
-    0xB9,0xB8,0xB8,0xB7,0xB6,0xB6,0xB5,0xB4,0xB3,0xB2,
-    0xB1,0xB0,0xAF,0xAE,0xAD,0xAC,0xAB,0xAA,0xA9,0xA8,
-    0xA6,0xA5,0xA4,0xA2,0xA1,0xA0,0x9E,0x9D,0x9B,0x9A,
-    0x98,0x97,0x95,0x94,0x92,0x91,0x8F,0x8D,0x8C,0x8A,
-    0x88,0x86,0x85,0x83,0x81,0x7F,0x7E,0x7C,0x7A,0x78,
-    0x76,0x74,0x73,0x71,0x6F,0x6D,0x6B,0x69,0x67,0x65
-};
-
-
-
 /* Driver stuff */
 static unsigned MaxX;
 static unsigned MaxY;
@@ -146,21 +112,39 @@ static void DoCheckerboard (void)
 static void DoDiagram (void)
 {
     static const unsigned char Palette[2] = { COLOR_WHITE, COLOR_BLACK };
-    unsigned X, I;
+    int XOrigin, YOrigin;
+    int Amp;
+    int X, Y;
+    unsigned I;
 
     tgi_setpalette (Palette);
     tgi_setcolor (COLOR_FORE);
-    tgi_line (10, 10, 10, MaxY-10);
-    tgi_lineto (MaxX-10, MaxY-10);
-    tgi_line (8, 12, 10, 10);
-    tgi_lineto (12, 12);
-    tgi_line (MaxX-12, MaxY-12, MaxX-10, MaxY-10);
-    tgi_lineto (MaxX-12, MaxY-8);
-    for (I = 0, X = 10; X < MaxX-10; ++X) {
-        tgi_setpixel (X, SinusTable[I]);
-	if (++I >= sizeof (SinusTable)) {
-	    I = 0;
-	}
+
+    /* 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 * -cc65_sin (I)) / 256);
+
+        /* Draw the line */
+        tgi_lineto (XOrigin + X, YOrigin + Y);
     }
 
     cgetc ();