From f3a8825d21f51c40d6e0323349c1f98561c4c5af Mon Sep 17 00:00:00 2001
From: Crayon2000 <crayon1@rocketmail.com>
Date: Sat, 28 Feb 2009 03:57:19 +0000
Subject: [PATCH] [NEW] GRRLIB_Circle function by Dark-Link

---
 GRRLIB/GRRLIB/GRRLIB.c         | 32 ++++++++++++++++++++++++++++++++
 GRRLIB/GRRLIB/GRRLIB.h         |  1 +
 examples/lesson1/source/main.c |  1 +
 readme.txt                     |  2 --
 4 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/GRRLIB/GRRLIB/GRRLIB.c b/GRRLIB/GRRLIB/GRRLIB.c
index bd1c288..1068e64 100644
--- a/GRRLIB/GRRLIB/GRRLIB.c
+++ b/GRRLIB/GRRLIB/GRRLIB.c
@@ -9,6 +9,7 @@
 #include <malloc.h>
 #include <stdarg.h>
 #include <string.h>
+#include <math.h>
 #include "../lib/libpng/pngu/pngu.h"
 #include "../lib/libjpeg/jpeglib.h"
 #include "GRRLIB.h"
@@ -90,6 +91,37 @@ inline void GRRLIB_Rectangle(f32 x, f32 y, f32 width, f32 height, u32 color, u8
     }
 }
 
+/**
+ * Draw a circle.
+ * @author Dark-Link
+ * @param x.
+ * @param y.
+ * @param radius the radius of the circle.
+ * @param color the color of the circle in RGBA format.
+ * @param filled true to fill the circle with a color.
+ */
+inline void GRRLIB_Circle(f32 x, f32 y, f32 radius, u32 color, u8 filled) {
+    Vector v[36];
+    u32 a;
+    f32 ra;
+    f32 G_DTOR = M_DTOR * 10;
+    
+    for (a = 0; a < 36; a++) {
+        ra = a * G_DTOR;
+
+        v[a].x = cos(ra) * radius + x;
+        v[a].y = sin(ra) * radius + y;
+        v[a].z = 0.0f;
+    }
+
+    if (!filled) {
+        GRRLIB_GXEngine(v, color, 36, GX_LINESTRIP);
+    }
+    else {
+        GRRLIB_GXEngine(v, color, 36, GX_TRIANGLEFAN);
+    }
+}
+
 /**
  * Draw a polygon.
  * @param v
diff --git a/GRRLIB/GRRLIB/GRRLIB.h b/GRRLIB/GRRLIB/GRRLIB.h
index 46031a1..eaa4f2c 100644
--- a/GRRLIB/GRRLIB/GRRLIB.h
+++ b/GRRLIB/GRRLIB/GRRLIB.h
@@ -69,6 +69,7 @@ void GRRLIB_NPlot(Vector v[], u32 color, long n);
 inline void GRRLIB_Line(f32 x1, f32 y1, f32 x2, f32 y2, u32 color);
 
 inline void GRRLIB_Rectangle(f32 x, f32 y, f32 width, f32 height, u32 color, u8 filled);
+inline void GRRLIB_Circle(f32 x, f32 y, f32 radius, u32 color, u8 filled);
 void GRRLIB_NGone(Vector v[], u32 color, long n);
 void GRRLIB_NGoneFilled(Vector v[], u32 color, long n);
 
diff --git a/examples/lesson1/source/main.c b/examples/lesson1/source/main.c
index 624c148..11eadee 100644
--- a/examples/lesson1/source/main.c
+++ b/examples/lesson1/source/main.c
@@ -147,6 +147,7 @@ int main() {
                 GRRLIB_Line(100, 100, 350, 200, GRRLIB_SILVER);
                 GRRLIB_NGoneFilled(triangle, GRRLIB_GRAY, 3);
                 GRRLIB_Rectangle(left + 150, top + 150, 200, 200, 0x0000FFC8, 1); // Blue with alpha
+                GRRLIB_Circle(left + 300, top + 300, 50, GRRLIB_OLIVE, 1);
 
                 // Draw a yellow four pixel dot where the wiimote is pointing
                 GRRLIB_Plot(ir1.sx, ir1.sy, GRRLIB_YELLOW);
diff --git a/readme.txt b/readme.txt
index 099b873..e1cfc3d 100644
--- a/readme.txt
+++ b/readme.txt
@@ -24,8 +24,6 @@ ChangeLog :
 
 * Color format change for ALL GRRLib function (now its RGBA) to fit to GX_Color format and use GX_Color1u32
 
-* Name Change GRRLIB_LoadTexture to GRRLIB_LoadTexturePNG
-
 * GRRLib introduce a new texture structure (easier to handle texture width, height, etc ...):
 	typedef struct GRRLIB_texImg{
 		unsigned int w;