David Smart
Example drawing mandelbrot on the RA8875 with touch to zoom in or out. Touch and hold > 4s to zoom out, touch to zoom in.
Saw the nice mandelbrot demo from Bob Stone and leverage it to use this library.
Revision 0:702ce703348d, committed 2015-01-13
- Comitter:
- WiredHome
- Date:
- Tue Jan 13 12:36:30 2015 +0000
- Child:
- 1:14319ec53540
- Commit message:
- Applied Mandelbrot drawing program from Bob Stone to this RA8875 library.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/RA8875.lib Tue Jan 13 12:36:30 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/WiredHome/code/RA8875/#022bba13c5c4
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jan 13 12:36:30 2015 +0000
@@ -0,0 +1,232 @@
+#include "mbed.h"
+
+#include "RA8875.h"
+
+
+Serial pc(USBTX, USBRX);
+RA8875 lcd(p5, p6, p7, p12, NC, "tft"); // MOSI, MISO, SCK, /ChipSelect, /reset, name
+uint16_t width, height;
+
+#if 1
+void drawMandelbrot(float centrex, float centrey, float zoom, int maxIter) {
+ float xmin = centrex - 1.0/zoom;
+ float xmax = centrex + 1.0/zoom;
+ float ymin = centrey - height / (width * zoom);
+ float ymax = centrey + height / (width *zoom);
+
+ float dx = (xmax - xmin) / width;
+ float dy = (ymax - ymin) / height;
+
+ float y = ymin;
+
+ float c;
+ unsigned int cr, cg, cb;
+
+ lcd.SetGraphicsCursor(0, 0);
+ color_t * pixelBuffer = (color_t *)malloc(width * sizeof(color_t));
+
+ for (int j = 0; j < height; j++) {
+ float x = xmin;
+
+ for (int i = 0; i < width; i++) {
+ float a = x;
+ float b = y;
+ int n = 0;
+
+ while (n < maxIter) {
+ float aa = a * a;
+ float bb = b * b;
+ float twoab = 2.0 * a * b;
+
+ a = aa - bb + x;
+ b = twoab + y;
+
+ if(aa + bb > 16.0) {
+ break;
+ }
+ n++;
+ }
+
+ if (n == maxIter) {
+ //It's in the set - Black
+ pixelBuffer[i] = Black; //lcd.pixel(i,j,Black);
+ } else {
+ //Not in the set - pick a colour
+ c = 3.0 * (maxIter-n)/maxIter;
+ cr = ((c < 1.0) ? 255 * ( 1.0 - c) : (c > 2.0) ? 255 * (c - 2.0) : 0);
+ cg = ((c < 1.0) ? 255 * c : (c > 2.0) ? 0 : 255 * (2.0 - c));
+ cb = ((c < 1.0) ? 0 : (c > 2.0) ? 255 * (3.0 - c) : 255 * (c - 1.0));
+ pixelBuffer[i] = RGB(cr,cg,cb); //lcd.pixel(i,j, RGB(cr,cg,cb));
+ }
+ x += dx;
+ }
+ lcd.pixelStream(pixelBuffer, width, 0, j); // send this scanline
+ y += dy;
+ }
+ free(pixelBuffer);
+}
+
+int main()
+{
+ Timer timer;
+ pc.baud(460800); // I like a snappy terminal, so crank it up!
+ pc.printf("\r\nRA8875 Portrait Mode Dev. - Build " __DATE__ " " __TIME__ "\r\n");
+ lcd.frequency(10000000);
+ lcd.init();
+ width = lcd.width(); // Could have set the dim, let's just adapt.
+ height = lcd.height();
+
+ lcd.claim(stdout); // send stdout to the TFT display
+ lcd.background(Black); // set background to black
+ lcd.foreground(White); // set chars to white
+ lcd.cls(); // clear the screen
+ //lcd.set_font((unsigned char*) Arial12x12); // select the font
+ //lcd.set_orientation(1);
+ lcd.TouchPanelCalibrate("Touch to Calibrate"); // calibrate the touch
+ point_t p;
+
+ lcd.locate(0,0);
+
+ //Setup base Mandelbrot
+ float centrex = -0.5;
+ float centrey = 0.0;
+ float zoom=0.5;
+ int maxiterations = 150;
+
+ while(true) {
+ //Draw it
+ drawMandelbrot(centrex, centrey, zoom, maxiterations);
+
+ //Wait for a touch
+ //p=lcd.get_touch();
+ //while(!lcd.is_touched(p)) {
+ // p=lcd.get_touch();
+ //}
+ pc.printf("ready for touch\r\n");
+ while (!lcd.TouchPanelGet(&p))
+ ;
+ timer.start();
+ timer.reset();
+ while (lcd.TouchPanelReadable())
+ ;
+ if (timer.read_ms() > 4000) { // long held is zoom out.
+ // zoom out
+ lcd.puts(50, 250, "Zooming out...");
+ pc.printf("zoom out\r\n");
+ centrex = -0.5;
+ centrey = 0.0;
+ zoom=0.5;
+ } else {
+ //Set new centre and zoom
+ //p = lcd.to_pixel(p);
+ lcd.puts(50, 250, "Zooming in...");
+ pc.printf("zoom in\r\n");
+ centrex += (2.0 * p.x - width) / (zoom * height);
+ centrey += (2.0 * p.y - height) / (zoom * width);
+ zoom *= 4.0;
+ lcd.rect(p.x - width / 8.0, p.y - height / 8.0,
+ p.x + width / 8.0, p.y + height / 8.0, Yellow);
+ }
+ }
+}
+
+#else
+
+void drawMandelbrot(float centrex, float centrey, float zoom, int maxIter) {
+ float xmin = centrex - 1.0/zoom;
+ float xmax = centrex + 1.0/zoom;
+ float ymin = centrey - height / (width * zoom);
+ float ymax = centrey + height / (width *zoom);
+
+ float dx = (xmax - xmin) / width;
+ float dy = (ymax - ymin) / height;
+
+ float y = ymin;
+
+ float c;
+ unsigned int cr, cg, cb;
+
+ for (int j = 0; j < height; j++) {
+ float x = xmin;
+
+ for (int i = 0; i < width; i++) {
+ float a = x;
+ float b = y;
+ int n = 0;
+
+ while (n < maxIter) {
+ float aa = a * a;
+ float bb = b * b;
+ float twoab = 2.0 * a * b;
+
+ a = aa - bb + x;
+ b = twoab + y;
+
+ if(aa + bb > 16.0) {
+ break;
+ }
+ n++;
+ }
+
+ if (n == maxIter) {
+ //It's in the set - Black
+ lcd.pixel(i,j,Black);
+ } else {
+ //Not in the set - pick a colour
+ c = 3.0 * (maxIter-n)/maxIter;
+ cr = ((c < 1.0) ? 255 * ( 1.0 - c) : (c > 2.0) ? 255 * (c - 2.0) : 0);
+ cg = ((c < 1.0) ? 255 * c : (c > 2.0) ? 0 : 255 * (2.0 - c));
+ cb = ((c < 1.0) ? 0 : (c > 2.0) ? 255 * (3.0 - c) : 255 * (c - 1.0));
+ lcd.pixel(i,j, RGB(cr,cg,cb));
+ }
+ x += dx;
+ }
+ y += dy;
+ }
+}
+
+int main()
+{
+ pc.baud(460800); // I like a snappy terminal, so crank it up!
+ pc.printf("\r\nRA8875 Portrait Mode Dev. - Build " __DATE__ " " __TIME__ "\r\n");
+
+ lcd.init();
+
+ wait_ms(250);
+
+ lcd.cls();
+ lcd.SetOrientation(RA8875::rotate_0);
+ lcd.puts(30,30, "Normal Landscape");
+ lcd.line(0,0, lcd.width()/2, lcd.height()/2);
+ wait_ms(2500);
+
+ lcd.cls();
+ lcd.SetOrientation(RA8875::rotate_90);
+ lcd.puts(30,30, "Rotated 90 Text\r\n");
+ lcd.line(0,0, lcd.width()/2, lcd.height()/2);
+ wait_ms(2500);
+
+ lcd.cls();
+ lcd.SetOrientation(RA8875::rotate_180);
+ lcd.puts(30,30, "Rotated 180 Text\r\n");
+ lcd.line(0,0, lcd.width()/2, lcd.height()/2);
+ wait_ms(2500);
+
+ lcd.cls();
+ lcd.SetOrientation(RA8875::rotate_270);
+ lcd.puts(30,30, "Rotated 270 Text\r\n");
+ lcd.line(0,0, lcd.width()/2, lcd.height()/2);
+ wait_ms(2500);
+
+
+ while(1) {
+ while(!lcd.readable())
+ ;
+ if (lcd.readable()) {
+ int k = lcd.getc();
+ pc.printf("key: %02X \r\n", k);
+ }
+ wait_ms(50);
+ }
+}
+#endif
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Jan 13 12:36:30 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file