From 1bfc5a9f85e7c3296095105ca8e3ee1215b22be8 Mon Sep 17 00:00:00 2001
From: Joel Bodenmann <joel@unormal.org>
Date: Mon, 11 Feb 2013 09:25:45 +0100
Subject: removed GDISP_LLD() macro - fix

---
 demos/applications/mandelbrot/main.c | 79 ++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 demos/applications/mandelbrot/main.c

(limited to 'demos/applications/mandelbrot/main.c')

diff --git a/demos/applications/mandelbrot/main.c b/demos/applications/mandelbrot/main.c
new file mode 100644
index 00000000..2fe1141d
--- /dev/null
+++ b/demos/applications/mandelbrot/main.c
@@ -0,0 +1,79 @@
+/*
+    ChibiOS/GFX - Copyright (C) 2012
+                 Joel Bodenmann aka Tectu <joel@unormal.org>
+
+    This file is part of ChibiOS/GFX.
+
+    ChibiOS/GFX is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/GFX is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ch.h"
+#include "hal.h"
+#include "gfx.h"
+
+void mandelbrot(float x1, float y1, float x2, float y2) {
+	unsigned int i,j, width, height;
+	uint16_t iter;
+	color_t color;
+	float fwidth, fheight;
+	
+	float sy = y2 - y1;
+	float sx = x2 - x1;
+	const int MAX = 512;
+	
+	width = (unsigned int)gdispGetWidth();
+	height = (unsigned int)gdispGetHeight();
+	fwidth = width;
+	fheight = height;
+	
+	for(i = 0; i < width; i++) {
+		for(j = 0; j < height; j++) {
+			float cy = j * sy / fheight + y1;
+			float cx = i * sx / fwidth + x1;
+			float x=0.0f, y=0.0f, xx=0.0f, yy=0.0f;
+			for(iter=0; iter <= MAX && xx+yy<4.0f; iter++) {
+				xx = x*x;
+				yy = y*y;
+				y = 2.0f*x*y + cy;
+				x = xx - yy + cx;
+			}
+			//color = ((iter << 8) | (iter&0xFF));
+			color = RGB2COLOR(iter<<7, iter<<4, iter);
+			gdispDrawPixel(i, j, color);
+		}
+	}
+}
+
+int main(void) {
+	float cx, cy;
+	float zoom = 1.0f;
+
+	halInit();
+	chSysInit();
+
+	gdispInit();
+
+	/* where to zoom in */
+	cx = -0.086f;
+	cy = 0.85f;
+
+	while(TRUE) {
+		mandelbrot(-2.0f*zoom+cx, -1.5f*zoom+cy, 2.0f*zoom+cx, 1.5f*zoom+cy);
+
+		zoom *= 0.7f;
+		if(zoom <= 0.00001f)
+			zoom = 1.0f;	
+	}
+}
+
-- 
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