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70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
1 year ago
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// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Small example how to use the library.
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// For more examples, look at demo-main.cc
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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 <unistd.h>
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#include <math.h>
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#include <stdio.h>
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#include <signal.h>
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using rgb_matrix::RGBMatrix;
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using rgb_matrix::Canvas;
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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 DrawOnCanvas(Canvas *canvas) {
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/*
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* Let's create a simple animation. We use the canvas to draw
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* pixels. We wait between each step to have a slower animation.
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*/
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canvas->Fill(0, 0, 255);
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int center_x = canvas->width() / 2;
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int center_y = canvas->height() / 2;
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float radius_max = canvas->width() / 2;
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float angle_step = 1.0 / 360;
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for (float a = 0, r = 0; r < radius_max; a += angle_step, r += angle_step) {
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if (interrupt_received)
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return;
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float dot_x = cos(a * 2 * M_PI) * r;
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float dot_y = sin(a * 2 * M_PI) * r;
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canvas->SetPixel(center_x + dot_x, center_y + dot_y,
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255, 0, 0);
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usleep(1 * 1000); // wait a little to slow down things.
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}
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}
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int main(int argc, char *argv[]) {
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RGBMatrix::Options defaults;
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defaults.hardware_mapping = "regular"; // or e.g. "adafruit-hat"
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defaults.rows = 32;
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defaults.chain_length = 1;
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defaults.parallel = 1;
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defaults.show_refresh_rate = true;
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Canvas *canvas = RGBMatrix::CreateFromFlags(&argc, &argv, &defaults);
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if (canvas == NULL)
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return 1;
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// It is always good to set up a signal handler to cleanly exit when we
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// receive a CTRL-C for instance. The DrawOnCanvas() routine is looking
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// for that.
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signal(SIGTERM, InterruptHandler);
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signal(SIGINT, InterruptHandler);
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DrawOnCanvas(canvas); // Using the canvas.
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// Animation finished. Shut down the RGB matrix.
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canvas->Clear();
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delete canvas;
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return 0;
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}
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