😛 quadratic bezier curve

organism/Makefile

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+# Uncomment lines below if you have problems with $PATH
+#SHELL := /bin/bash
+#PATH := /usr/local/bin:$(PATH)
+
+all:
+		pio.exe -f -c vim run
+
+upload:
+		pio.exe -f -c vim run --target upload
+
+clean:
+		pio.exe -f -c vim run --target clean
+
+program:
+		pio.exe -f -c vim run --target program
+
+uploadfs:
+		pio.exe -f -c vim run --target uploadfs
+
+update:
+		pio.exe -f -c vim update

organism/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:adafruit_matrixportal_esp32s3]
+platform = espressif32
+board = adafruit_matrixportal_esp32s3
+framework = arduino
+monitor_speed = 115200
+
+lib_deps =
+  adafruit/Adafruit GFX Library
+  adafruit/Adafruit BusIO
+  Wire
+  fastled/FastLED
+  https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-I2S-DMA.git

organism/src/main.cpp

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+#include <Arduino.h>
+#include "xtensa/core-macros.h"
+#include <ESP32-HUB75-MatrixPanel-I2S-DMA.h>
+
+#include "main.h"
+
+#define R1 42
+#define G1 40
+#define BL1 41
+#define R2 38
+#define G2 37
+#define BL2 39
+#define CH_A 45
+#define CH_B 36
+#define CH_C 48
+#define CH_D 35
+#define CH_E 21
+#define CLK 2
+#define LAT 47
+#define OE 14
+
+#define PIN_E 21
+#define PANEL_WIDTH 64
+#define PANEL_HEIGHT 32         // Panel height of 64 will required PIN_E to be defined.
+
+#define PANELS_NUMBER 1
+
+#define PANE_WIDTH PANEL_WIDTH * PANELS_NUMBER
+#define PANE_HEIGHT PANEL_HEIGHT
+#define NUM_LEDS PANE_WIDTH*PANE_HEIGHT
+
+#define ONBOARD_LED 13
+
+MatrixPanel_I2S_DMA *matrix = nullptr;
+
+int start_x = 5;
+int start_y = 5;
+int end_x = 59;
+int end_y = 27;
+
+int anchor_x = 16;
+int anchor_y = 24;
+
+void setup(){
+  Serial.begin(BAUD_RATE);
+  pinMode(ONBOARD_LED, OUTPUT);
+
+  // redefine pins if required
+  HUB75_I2S_CFG::i2s_pins _pins={R1, G1, BL1, R2, G2, BL2, CH_A, CH_B, CH_C, CH_D, CH_E, LAT, OE, CLK};
+  HUB75_I2S_CFG mxconfig(PANEL_WIDTH, PANEL_HEIGHT, PANELS_NUMBER, _pins);
+
+  mxconfig.gpio.e = PIN_E;
+  mxconfig.driver = HUB75_I2S_CFG::FM6126A;   // for panels using FM6126A chips
+
+  mxconfig.latch_blanking = 4;
+  mxconfig.i2sspeed = HUB75_I2S_CFG::HZ_10M;
+  mxconfig.clkphase = false;
+
+  //mxconfig.double_buff = true;
+
+  matrix = new MatrixPanel_I2S_DMA(mxconfig);
+  matrix->begin();
+  matrix->setBrightness8(64);
+  matrix->fillScreenRGB888(0, 0, 0);
+}
+
+int interpolate(int from, int to, float percent) {
+    int difference = to - from;
+    return from + ( difference * percent );
+}
+
+void draw_bezier(int x1, int y1, int x2, int y2, int x3, int y3, float percent) {
+  // draw lines to p2
+  matrix->drawLine(x1, y1, x2, y2, matrix->color565(16, 16, 16));
+  matrix->drawLine(x2, y2, x3, y3, matrix->color565(16, 16, 16));
+
+  int xa = interpolate(x1, x2, percent);
+  int ya = interpolate(y1, y2, percent);
+  int xb = interpolate(x2, x3, percent);
+  int yb = interpolate(y2, y3, percent);
+  //matrix->drawLine(xa, ya, xb, yb, matrix->color565(0, 128, 0));
+
+  int x = interpolate(xa, xb, percent);
+  int y = interpolate(ya, yb, percent);
+
+  matrix->drawPixel(x, y, matrix->color565(255, 255, 255));
+}
+
+void loop() {
+ // matrix ->flipDMABuffer();
+  matrix->clearScreen();
+ // delay(25);
+  anchor_y += 1;
+  if (anchor_y >= 32) {
+    anchor_y = 0;
+  }
+  for (float i = 0; i < 1; i += 0.02) {
+    draw_bezier(start_x, start_y, anchor_x, anchor_y, end_x, end_y, i);
+  }
+  matrix->drawPixel(start_x, start_y, matrix->color565(255, 0, 0));
+  matrix->drawPixel(end_x, end_y, matrix->color565(255, 0, 0));
+  matrix->drawPixel(anchor_x, anchor_y, matrix->color565(255, 0, 255));
+  delay(100);
+}
+

organism/src/main.h

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+#include <FastLED.h>
+
+#define BAUD_RATE       115200  // serial debug port baud rate
+
+void buffclear(CRGB *buf);
+uint16_t XY16( uint16_t x, uint16_t y);
+void mxfill(CRGB *leds);
+uint16_t colorWheel(uint8_t pos);
+void drawText(int colorWheelOffset);
+