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Chuck
210
rpi-rgb-led-matrix-master/examples-api-use/pixel-mover.cc
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210
rpi-rgb-led-matrix-master/examples-api-use/pixel-mover.cc
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// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Small example how to use the input bits
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//
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// This code is public domain
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// (but note, that the led-matrix library this depends on is GPL v2)
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#include "led-matrix.h"
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#include "graphics.h"
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#include <ctype.h>
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#include <getopt.h>
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#include <math.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include <deque>
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using namespace rgb_matrix;
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volatile bool interrupt_received = false;
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static void InterruptHandler(int signo) {
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interrupt_received = true;
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}
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static void InteractiveUseMessage() {
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fprintf(stderr,
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"Move around with common movement keysets \n"
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" W,A,S,D (gaming move style) or\n"
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" H,J,K,L (vi console move style)\n"
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" Quit with 'q' or <ESC>\n"
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"The pixel position cannot be less than 0 or greater than the "
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"display height and width.\n");
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}
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static int usage(const char *progname) {
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fprintf(stderr, "usage: %s [options]\n", progname);
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fprintf(stderr, "Display single pixel with any colour.\n");
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InteractiveUseMessage();
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fprintf(stderr, "Options:\n\n");
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fprintf(stderr,
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"\t-C <r,g,b> : Color at front of trail. Default 255,255,0\n"
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"\t-t <trail-len> : Length of trail behind dot (default:0)\n"
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"\t-c <r,g,b> : Color at end of trail. Default 0,0,255\n\n"
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);
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rgb_matrix::PrintMatrixFlags(stderr);
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return 1;
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}
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static bool parseColor(Color *c, const char *str) {
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return sscanf(str, "%hhu,%hhu,%hhu", &c->r, &c->g, &c->b) == 3;
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}
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static char getch() {
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static bool is_terminal = isatty(STDIN_FILENO);
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struct termios old;
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if (is_terminal) {
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if (tcgetattr(0, &old) < 0)
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perror("tcsetattr()");
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// Set to unbuffered mode
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struct termios no_echo = old;
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no_echo.c_lflag &= ~ICANON;
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no_echo.c_lflag &= ~ECHO;
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no_echo.c_cc[VMIN] = 1;
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no_echo.c_cc[VTIME] = 0;
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if (tcsetattr(0, TCSANOW, &no_echo) < 0)
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perror("tcsetattr ICANON");
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}
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char buf = 0;
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if (read(STDIN_FILENO, &buf, 1) < 0)
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perror ("read()");
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if (is_terminal) {
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// Back to original terminal settings.
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if (tcsetattr(0, TCSADRAIN, &old) < 0)
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perror ("tcsetattr ~ICANON");
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}
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return buf;
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}
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// Interpolation of color between head and tail of trail.
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static uint8_t quantize(float c) {
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return c < 0 ? 0 : c > 255 ? 255 : roundf(c);
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}
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static Color interpolate(const Color &c1, const Color &c2, float fraction) {
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float c2_fraction = 1 - fraction;
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return { quantize(c1.r * fraction + c2.r * c2_fraction),
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quantize(c1.g * fraction + c2.g * c2_fraction),
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quantize(c1.b * fraction + c2.b * c2_fraction)};
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}
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int main(int argc, char *argv[]) {
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RGBMatrix::Options matrix_options;
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rgb_matrix::RuntimeOptions runtime_opt;
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if (!rgb_matrix::ParseOptionsFromFlags(&argc, &argv,
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&matrix_options, &runtime_opt)) {
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return usage(argv[0]);
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}
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Color front_color(255, 255, 0);
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Color back_color(0, 0, 255);
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int trail_len = 0;
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int opt;
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while ((opt = getopt(argc, argv, "C:c:t:")) != -1) {
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switch (opt) {
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case 't':
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trail_len = std::max(0, atoi(optarg));
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break;
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case 'C':
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if (!parseColor(&front_color, optarg)) {
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fprintf(stderr, "Invalid color spec: %s\n", optarg);
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return usage(argv[0]);
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}
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break;
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case 'c':
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if (!parseColor(&back_color, optarg)) {
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fprintf(stderr, "Invalid color spec: %s\n", optarg);
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return usage(argv[0]);
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}
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break;
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default:
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return usage(argv[0]);
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}
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}
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RGBMatrix *matrix = RGBMatrix::CreateFromOptions(matrix_options, runtime_opt);
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if (matrix == NULL)
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return usage(argv[0]);
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rgb_matrix::FrameCanvas *canvas = matrix->CreateFrameCanvas();
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signal(SIGTERM, InterruptHandler);
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signal(SIGINT, InterruptHandler);
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std::deque<std::pair<int, int>> trail;
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int x_pos = 0;
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int y_pos = 0;
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trail.push_back({x_pos, y_pos});
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InteractiveUseMessage();
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const bool output_is_terminal = isatty(STDOUT_FILENO);
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bool running = true;
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while (!interrupt_received && running) {
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canvas->Clear();
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int distance_from_head = trail.size();
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for (const auto &pos : trail) { // Draw from tail -> head
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distance_from_head--;
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Color c = interpolate(front_color, back_color,
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1.0 - 1.0f * distance_from_head / trail.size());
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canvas->SetPixel(pos.first, pos.second, c.r, c.g, c.b);
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}
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canvas = matrix->SwapOnVSync(canvas);
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printf("%sX,Y = %d,%d%s",
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output_is_terminal ? "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b" : "",
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x_pos, y_pos,
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output_is_terminal ? " " : "\n");
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fflush(stdout);
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const char c = tolower(getch());
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switch (c) {
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case 'w': case 'k': // Up
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if (y_pos > 0) {
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y_pos--;
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trail.push_back({x_pos, y_pos});
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}
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break;
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case 's': case 'j': // Down
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if (y_pos < canvas->height() - 1) {
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y_pos++;
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trail.push_back({x_pos, y_pos});
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}
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break;
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case 'a': case 'h': // Left
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if (x_pos > 0) {
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x_pos--;
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trail.push_back({x_pos, y_pos});
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}
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break;
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case 'd': case 'l': // Right
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if (x_pos < canvas->width() - 1) {
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x_pos++;
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trail.push_back({x_pos, y_pos});
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}
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break;
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// All kinds of conditions which we use to exit
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case 0x1B: // Escape
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case 'q': // 'Q'uit
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case 0x04: // End of file
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case 0x00: // Other issue from getch()
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running = false;
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break;
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}
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while ((int)trail.size() > trail_len + 1)
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trail.pop_front(); // items on front are the oldest dots
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}
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// Finished. Shut down the RGB matrix.
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delete matrix;
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printf("\n");
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return 0;
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}
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