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XIAO ESP32C6+SSD1306、円を書いて遊ぶ。(アルゴリズムを考える

Last updated at Posted at 2025-05-22

結果

image_original(39).jpg

プログラム



//OLED_SSD1331_en2_XIAO_ESP32C6


//ヘッダーファイル
#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>


//定義
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);



void draw_circle_bad(int diameter) {

    // 円の中心の座標
    int cx = diameter / 2;
    int cy = diameter / 2;
    // 円の半径
    int radius = diameter / 2;
    //radius = radius - 1;

    // 円を描画する

  for(int y = 0;y < diameter;y++){
    for(int x = 0;x < diameter;x++){


      // 円の中心からの距離を計算・判定する
      // 0.5 を足し、ピクセルの中心で判定する
      int dx = (x<<1) + 1 - (cx<<1);
      int dy = (y<<1) + 1 - (cy<<1);

      if (  ((dx * dx) + (dy * dy)) <= ((radius<<1) * (radius<<1))  ) {
        // 円の中なので、点を描画する
        display.drawPixel(x,y,WHITE);
        display.drawPixel(diameter-x,y,WHITE);
        break;
      }

    }
    delay(50);
    display.display();
  }
  
    // 描画バッファの内容を画面に表示
  display.display();

}


//初期化
void setup() {

  //I2Cの初期化
  Wire.begin(D9,D10); //XIAO ESP32C6+SSD1306
  //Wire.begin(D10,D9); //XIAO ESP32C6+GROVE

  // I2Cアドレスは使用するディスプレイに合わせて変更する
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

}//setup


//メインループ
void loop() {

  // 画面表示をクリア
  display.fillScreen(BLACK);

  draw_circle_bad(30);
  //draw_circle_bad(6);

 //while(1);

  delay(5000); //5秒待つ

}//loop



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