David Smart / Mbed 2 deprecated PUB_RA8875_Mandelbrot

Example drawing mandelbrot on the RA8875 with touch to zoom in or out. Touch and hold > 4s to zoom out, touch to zoom in.

Dependencies:   mbed RA8875

Saw the nice mandelbrot demo from Bob Stone and leverage it to use this library.

main.cpp@0:702ce703348d, 2015-01-13 (annotated)

Committer:
WiredHome
Date:
Tue Jan 13 12:36:30 2015 +0000
Revision:
0:702ce703348d
Child:
1:14319ec53540
Applied Mandelbrot drawing program from Bob Stone to this RA8875 library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WiredHome 0:702ce703348d 1 #include "mbed.h"
WiredHome 0:702ce703348d 2
WiredHome 0:702ce703348d 3 #include "RA8875.h"
WiredHome 0:702ce703348d 4
WiredHome 0:702ce703348d 5
WiredHome 0:702ce703348d 6 Serial pc(USBTX, USBRX);
WiredHome 0:702ce703348d 7 RA8875 lcd(p5, p6, p7, p12, NC, "tft"); // MOSI, MISO, SCK, /ChipSelect, /reset, name
WiredHome 0:702ce703348d 8 uint16_t width, height;
WiredHome 0:702ce703348d 9
WiredHome 0:702ce703348d 10 #if 1
WiredHome 0:702ce703348d 11 void drawMandelbrot(float centrex, float centrey, float zoom, int maxIter) {
WiredHome 0:702ce703348d 12 float xmin = centrex - 1.0/zoom;
WiredHome 0:702ce703348d 13 float xmax = centrex + 1.0/zoom;
WiredHome 0:702ce703348d 14 float ymin = centrey - height / (width * zoom);
WiredHome 0:702ce703348d 15 float ymax = centrey + height / (width *zoom);
WiredHome 0:702ce703348d 16
WiredHome 0:702ce703348d 17 float dx = (xmax - xmin) / width;
WiredHome 0:702ce703348d 18 float dy = (ymax - ymin) / height;
WiredHome 0:702ce703348d 19
WiredHome 0:702ce703348d 20 float y = ymin;
WiredHome 0:702ce703348d 21
WiredHome 0:702ce703348d 22 float c;
WiredHome 0:702ce703348d 23 unsigned int cr, cg, cb;
WiredHome 0:702ce703348d 24
WiredHome 0:702ce703348d 25 lcd.SetGraphicsCursor(0, 0);
WiredHome 0:702ce703348d 26 color_t * pixelBuffer = (color_t *)malloc(width * sizeof(color_t));
WiredHome 0:702ce703348d 27
WiredHome 0:702ce703348d 28 for (int j = 0; j < height; j++) {
WiredHome 0:702ce703348d 29 float x = xmin;
WiredHome 0:702ce703348d 30
WiredHome 0:702ce703348d 31 for (int i = 0; i < width; i++) {
WiredHome 0:702ce703348d 32 float a = x;
WiredHome 0:702ce703348d 33 float b = y;
WiredHome 0:702ce703348d 34 int n = 0;
WiredHome 0:702ce703348d 35
WiredHome 0:702ce703348d 36 while (n < maxIter) {
WiredHome 0:702ce703348d 37 float aa = a * a;
WiredHome 0:702ce703348d 38 float bb = b * b;
WiredHome 0:702ce703348d 39 float twoab = 2.0 * a * b;
WiredHome 0:702ce703348d 40
WiredHome 0:702ce703348d 41 a = aa - bb + x;
WiredHome 0:702ce703348d 42 b = twoab + y;
WiredHome 0:702ce703348d 43
WiredHome 0:702ce703348d 44 if(aa + bb > 16.0) {
WiredHome 0:702ce703348d 45 break;
WiredHome 0:702ce703348d 46 }
WiredHome 0:702ce703348d 47 n++;
WiredHome 0:702ce703348d 48 }
WiredHome 0:702ce703348d 49
WiredHome 0:702ce703348d 50 if (n == maxIter) {
WiredHome 0:702ce703348d 51 //It's in the set - Black
WiredHome 0:702ce703348d 52 pixelBuffer[i] = Black; //lcd.pixel(i,j,Black);
WiredHome 0:702ce703348d 53 } else {
WiredHome 0:702ce703348d 54 //Not in the set - pick a colour
WiredHome 0:702ce703348d 55 c = 3.0 * (maxIter-n)/maxIter;
WiredHome 0:702ce703348d 56 cr = ((c < 1.0) ? 255 * ( 1.0 - c) : (c > 2.0) ? 255 * (c - 2.0) : 0);
WiredHome 0:702ce703348d 57 cg = ((c < 1.0) ? 255 * c : (c > 2.0) ? 0 : 255 * (2.0 - c));
WiredHome 0:702ce703348d 58 cb = ((c < 1.0) ? 0 : (c > 2.0) ? 255 * (3.0 - c) : 255 * (c - 1.0));
WiredHome 0:702ce703348d 59 pixelBuffer[i] = RGB(cr,cg,cb); //lcd.pixel(i,j, RGB(cr,cg,cb));
WiredHome 0:702ce703348d 60 }
WiredHome 0:702ce703348d 61 x += dx;
WiredHome 0:702ce703348d 62 }
WiredHome 0:702ce703348d 63 lcd.pixelStream(pixelBuffer, width, 0, j); // send this scanline
WiredHome 0:702ce703348d 64 y += dy;
WiredHome 0:702ce703348d 65 }
WiredHome 0:702ce703348d 66 free(pixelBuffer);
WiredHome 0:702ce703348d 67 }
WiredHome 0:702ce703348d 68
WiredHome 0:702ce703348d 69 int main()
WiredHome 0:702ce703348d 70 {
WiredHome 0:702ce703348d 71 Timer timer;
WiredHome 0:702ce703348d 72 pc.baud(460800); // I like a snappy terminal, so crank it up!
WiredHome 0:702ce703348d 73 pc.printf("\r\nRA8875 Portrait Mode Dev. - Build " __DATE__ " " __TIME__ "\r\n");
WiredHome 0:702ce703348d 74 lcd.frequency(10000000);
WiredHome 0:702ce703348d 75 lcd.init();
WiredHome 0:702ce703348d 76 width = lcd.width(); // Could have set the dim, let's just adapt.
WiredHome 0:702ce703348d 77 height = lcd.height();
WiredHome 0:702ce703348d 78
WiredHome 0:702ce703348d 79 lcd.claim(stdout); // send stdout to the TFT display
WiredHome 0:702ce703348d 80 lcd.background(Black); // set background to black
WiredHome 0:702ce703348d 81 lcd.foreground(White); // set chars to white
WiredHome 0:702ce703348d 82 lcd.cls(); // clear the screen
WiredHome 0:702ce703348d 83 //lcd.set_font((unsigned char*) Arial12x12); // select the font
WiredHome 0:702ce703348d 84 //lcd.set_orientation(1);
WiredHome 0:702ce703348d 85 lcd.TouchPanelCalibrate("Touch to Calibrate"); // calibrate the touch
WiredHome 0:702ce703348d 86 point_t p;
WiredHome 0:702ce703348d 87
WiredHome 0:702ce703348d 88 lcd.locate(0,0);
WiredHome 0:702ce703348d 89
WiredHome 0:702ce703348d 90 //Setup base Mandelbrot
WiredHome 0:702ce703348d 91 float centrex = -0.5;
WiredHome 0:702ce703348d 92 float centrey = 0.0;
WiredHome 0:702ce703348d 93 float zoom=0.5;
WiredHome 0:702ce703348d 94 int maxiterations = 150;
WiredHome 0:702ce703348d 95
WiredHome 0:702ce703348d 96 while(true) {
WiredHome 0:702ce703348d 97 //Draw it
WiredHome 0:702ce703348d 98 drawMandelbrot(centrex, centrey, zoom, maxiterations);
WiredHome 0:702ce703348d 99
WiredHome 0:702ce703348d 100 //Wait for a touch
WiredHome 0:702ce703348d 101 //p=lcd.get_touch();
WiredHome 0:702ce703348d 102 //while(!lcd.is_touched(p)) {
WiredHome 0:702ce703348d 103 // p=lcd.get_touch();
WiredHome 0:702ce703348d 104 //}
WiredHome 0:702ce703348d 105 pc.printf("ready for touch\r\n");
WiredHome 0:702ce703348d 106 while (!lcd.TouchPanelGet(&p))
WiredHome 0:702ce703348d 107 ;
WiredHome 0:702ce703348d 108 timer.start();
WiredHome 0:702ce703348d 109 timer.reset();
WiredHome 0:702ce703348d 110 while (lcd.TouchPanelReadable())
WiredHome 0:702ce703348d 111 ;
WiredHome 0:702ce703348d 112 if (timer.read_ms() > 4000) { // long held is zoom out.
WiredHome 0:702ce703348d 113 // zoom out
WiredHome 0:702ce703348d 114 lcd.puts(50, 250, "Zooming out...");
WiredHome 0:702ce703348d 115 pc.printf("zoom out\r\n");
WiredHome 0:702ce703348d 116 centrex = -0.5;
WiredHome 0:702ce703348d 117 centrey = 0.0;
WiredHome 0:702ce703348d 118 zoom=0.5;
WiredHome 0:702ce703348d 119 } else {
WiredHome 0:702ce703348d 120 //Set new centre and zoom
WiredHome 0:702ce703348d 121 //p = lcd.to_pixel(p);
WiredHome 0:702ce703348d 122 lcd.puts(50, 250, "Zooming in...");
WiredHome 0:702ce703348d 123 pc.printf("zoom in\r\n");
WiredHome 0:702ce703348d 124 centrex += (2.0 * p.x - width) / (zoom * height);
WiredHome 0:702ce703348d 125 centrey += (2.0 * p.y - height) / (zoom * width);
WiredHome 0:702ce703348d 126 zoom *= 4.0;
WiredHome 0:702ce703348d 127 lcd.rect(p.x - width / 8.0, p.y - height / 8.0,
WiredHome 0:702ce703348d 128 p.x + width / 8.0, p.y + height / 8.0, Yellow);
WiredHome 0:702ce703348d 129 }
WiredHome 0:702ce703348d 130 }
WiredHome 0:702ce703348d 131 }
WiredHome 0:702ce703348d 132
WiredHome 0:702ce703348d 133 #else
WiredHome 0:702ce703348d 134
WiredHome 0:702ce703348d 135 void drawMandelbrot(float centrex, float centrey, float zoom, int maxIter) {
WiredHome 0:702ce703348d 136 float xmin = centrex - 1.0/zoom;
WiredHome 0:702ce703348d 137 float xmax = centrex + 1.0/zoom;
WiredHome 0:702ce703348d 138 float ymin = centrey - height / (width * zoom);
WiredHome 0:702ce703348d 139 float ymax = centrey + height / (width *zoom);
WiredHome 0:702ce703348d 140
WiredHome 0:702ce703348d 141 float dx = (xmax - xmin) / width;
WiredHome 0:702ce703348d 142 float dy = (ymax - ymin) / height;
WiredHome 0:702ce703348d 143
WiredHome 0:702ce703348d 144 float y = ymin;
WiredHome 0:702ce703348d 145
WiredHome 0:702ce703348d 146 float c;
WiredHome 0:702ce703348d 147 unsigned int cr, cg, cb;
WiredHome 0:702ce703348d 148
WiredHome 0:702ce703348d 149 for (int j = 0; j < height; j++) {
WiredHome 0:702ce703348d 150 float x = xmin;
WiredHome 0:702ce703348d 151
WiredHome 0:702ce703348d 152 for (int i = 0; i < width; i++) {
WiredHome 0:702ce703348d 153 float a = x;
WiredHome 0:702ce703348d 154 float b = y;
WiredHome 0:702ce703348d 155 int n = 0;
WiredHome 0:702ce703348d 156
WiredHome 0:702ce703348d 157 while (n < maxIter) {
WiredHome 0:702ce703348d 158 float aa = a * a;
WiredHome 0:702ce703348d 159 float bb = b * b;
WiredHome 0:702ce703348d 160 float twoab = 2.0 * a * b;
WiredHome 0:702ce703348d 161
WiredHome 0:702ce703348d 162 a = aa - bb + x;
WiredHome 0:702ce703348d 163 b = twoab + y;
WiredHome 0:702ce703348d 164
WiredHome 0:702ce703348d 165 if(aa + bb > 16.0) {
WiredHome 0:702ce703348d 166 break;
WiredHome 0:702ce703348d 167 }
WiredHome 0:702ce703348d 168 n++;
WiredHome 0:702ce703348d 169 }
WiredHome 0:702ce703348d 170
WiredHome 0:702ce703348d 171 if (n == maxIter) {
WiredHome 0:702ce703348d 172 //It's in the set - Black
WiredHome 0:702ce703348d 173 lcd.pixel(i,j,Black);
WiredHome 0:702ce703348d 174 } else {
WiredHome 0:702ce703348d 175 //Not in the set - pick a colour
WiredHome 0:702ce703348d 176 c = 3.0 * (maxIter-n)/maxIter;
WiredHome 0:702ce703348d 177 cr = ((c < 1.0) ? 255 * ( 1.0 - c) : (c > 2.0) ? 255 * (c - 2.0) : 0);
WiredHome 0:702ce703348d 178 cg = ((c < 1.0) ? 255 * c : (c > 2.0) ? 0 : 255 * (2.0 - c));
WiredHome 0:702ce703348d 179 cb = ((c < 1.0) ? 0 : (c > 2.0) ? 255 * (3.0 - c) : 255 * (c - 1.0));
WiredHome 0:702ce703348d 180 lcd.pixel(i,j, RGB(cr,cg,cb));
WiredHome 0:702ce703348d 181 }
WiredHome 0:702ce703348d 182 x += dx;
WiredHome 0:702ce703348d 183 }
WiredHome 0:702ce703348d 184 y += dy;
WiredHome 0:702ce703348d 185 }
WiredHome 0:702ce703348d 186 }
WiredHome 0:702ce703348d 187
WiredHome 0:702ce703348d 188 int main()
WiredHome 0:702ce703348d 189 {
WiredHome 0:702ce703348d 190 pc.baud(460800); // I like a snappy terminal, so crank it up!
WiredHome 0:702ce703348d 191 pc.printf("\r\nRA8875 Portrait Mode Dev. - Build " __DATE__ " " __TIME__ "\r\n");
WiredHome 0:702ce703348d 192
WiredHome 0:702ce703348d 193 lcd.init();
WiredHome 0:702ce703348d 194
WiredHome 0:702ce703348d 195 wait_ms(250);
WiredHome 0:702ce703348d 196
WiredHome 0:702ce703348d 197 lcd.cls();
WiredHome 0:702ce703348d 198 lcd.SetOrientation(RA8875::rotate_0);
WiredHome 0:702ce703348d 199 lcd.puts(30,30, "Normal Landscape");
WiredHome 0:702ce703348d 200 lcd.line(0,0, lcd.width()/2, lcd.height()/2);
WiredHome 0:702ce703348d 201 wait_ms(2500);
WiredHome 0:702ce703348d 202
WiredHome 0:702ce703348d 203 lcd.cls();
WiredHome 0:702ce703348d 204 lcd.SetOrientation(RA8875::rotate_90);
WiredHome 0:702ce703348d 205 lcd.puts(30,30, "Rotated 90 Text\r\n");
WiredHome 0:702ce703348d 206 lcd.line(0,0, lcd.width()/2, lcd.height()/2);
WiredHome 0:702ce703348d 207 wait_ms(2500);
WiredHome 0:702ce703348d 208
WiredHome 0:702ce703348d 209 lcd.cls();
WiredHome 0:702ce703348d 210 lcd.SetOrientation(RA8875::rotate_180);
WiredHome 0:702ce703348d 211 lcd.puts(30,30, "Rotated 180 Text\r\n");
WiredHome 0:702ce703348d 212 lcd.line(0,0, lcd.width()/2, lcd.height()/2);
WiredHome 0:702ce703348d 213 wait_ms(2500);
WiredHome 0:702ce703348d 214
WiredHome 0:702ce703348d 215 lcd.cls();
WiredHome 0:702ce703348d 216 lcd.SetOrientation(RA8875::rotate_270);
WiredHome 0:702ce703348d 217 lcd.puts(30,30, "Rotated 270 Text\r\n");
WiredHome 0:702ce703348d 218 lcd.line(0,0, lcd.width()/2, lcd.height()/2);
WiredHome 0:702ce703348d 219 wait_ms(2500);
WiredHome 0:702ce703348d 220
WiredHome 0:702ce703348d 221
WiredHome 0:702ce703348d 222 while(1) {
WiredHome 0:702ce703348d 223 while(!lcd.readable())
WiredHome 0:702ce703348d 224 ;
WiredHome 0:702ce703348d 225 if (lcd.readable()) {
WiredHome 0:702ce703348d 226 int k = lcd.getc();
WiredHome 0:702ce703348d 227 pc.printf("key: %02X \r\n", k);
WiredHome 0:702ce703348d 228 }
WiredHome 0:702ce703348d 229 wait_ms(50);
WiredHome 0:702ce703348d 230 }
WiredHome 0:702ce703348d 231 }
WiredHome 0:702ce703348d 232 #endif