arduinoでマンデルブロ

#概要

arduinoでマンデルブロやってみた。

#写真

#サンプルコード

#include <Adafruit_GFX.h>
#include "Adafruit_TFTLCD.h"

#define XP			  8
#define YP			  A3
#define XM			  A2
#define YM			  9
#define TS_MINX		 150 - 40
#define TS_MAXX		 920 - 40
#define TS_MINY		 120 - 40
#define TS_MAXY		 940 - 40
#define LCD_CS		  A3
#define LCD_CD		  A2
#define LCD_WR		  A1
#define LCD_RD		  A0
#define LCD_RESET	   A4
#define BLACK		   0x0000
#define BLUE			0x001F
#define RED			 0xF800
#define GREEN		   0x07E0
#define CYAN			0x07FF
#define MAGENTA		 0xF81F
#define YELLOW		  0xFFE0
#define WHITE		   0xFFFF
#define MINPRESSURE	 10
#define MAXPRESSURE	 1000

Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET);

const int MAX = 256;
float cx, 
	cy;
float zoom = 1.0f;
void mandelbrot(float x1, float y1, float x2, float y2) {
	unsigned int i,
		j;
	uint16_t iter;
	uint16_t color;
	float sy = y2 - y1;
	float sx = x2 - x1;
	for(i = 0; i < tft.width(); i++) 
	{
		for(j = 0; j < tft.height(); j++) 
		{
			float cy = j * sy / tft.height() + y1;
			float cx = i * sx / tft.width() + 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 << 7 & 0xF8) << 8) | ((iter << 4 & 0xFC) << 3) | (iter >> 3);
			tft.drawPixel(i, j, color);
		}
	}
}

void setup(void) {
	int i;
	tft.reset();
	uint16_t identifier = 0x9341;
	tft.begin(identifier);
	tft.fillScreen(BLACK);
	cx = -0.086f;
	cy = 0.55f;
}
void loop() { 
	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;
}

以上。