【花雕学编程】Arduino动手做（249）---ESP32 1.28寸 TFT GC9A01屏之半圆环温度进度条

/*
  【Arduino】189种传感器模块系列实验（资料代码+仿真编程+图形编程）
  实验二百四十九：1.28寸圆形彩色TFT显示屏 高清IPS 模块 240*240 SPI接口GC9A01驱动
  项目之八十七：GC9A01园屏之半圆环温度进度条
*/

//       GC9A01---------- ESP32
//       RST ------------ NC（复位引脚，此处未连接）
//       CS ------------- D4（片选引脚，连接到ESP32的D4引脚）
//       DC ------------- D2（数据/命令选择引脚，连接到ESP32的D2引脚）
//       SDA ------------ D23 (green)（主数据输出引脚，连接到ESP32的D23引脚，绿色线）
//       SCL ------------ D18 (yellow)（时钟信号引脚，连接到ESP32的D18引脚，黄色线）
//       GND ------------ GND（接地引脚，连接到ESP32的接地端）
//       VCC -------------3V3（电源引脚，连接到ESP32的3.3V电源）

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_GC9A01A.h"
#include "math.h"

#define TFT_CS 4
#define TFT_DC 2
#define TFT_RST -1

Adafruit_GC9A01A tft = Adafruit_GC9A01A(TFT_CS, TFT_DC, TFT_RST);

#define SCREEN_WIDTH 240
#define SCREEN_HEIGHT 240
#define CENTER_X SCREEN_WIDTH / 2
#define CENTER_Y SCREEN_HEIGHT - 20  // **进度条底部中心**
#define RADIUS 100  // **半圆进度条半径**
#define SPEED 2  // **温度变化速度**
#define MAX_TEMP 100  // **最大温度（对应半圆填充 100%）**

int temperature = 0;

void setup() {
    Serial.begin(115200);
    tft.begin();
    tft.setRotation(2);
}

void loop() {
    tft.fillScreen(tft.color565(0, 0, 0));

    // **绘制半圆外框**
    for (int angle = 0; angle <= 180; angle += 5) {
        float radian = angle * M_PI / 180;
        int x1 = CENTER_X + RADIUS * cos(radian);
        int y1 = CENTER_Y - RADIUS * sin(radian);
        int x2 = CENTER_X + (RADIUS - 5) * cos(radian);
        int y2 = CENTER_Y - (RADIUS - 5) * sin(radian);
        tft.drawLine(x1, y1, x2, y2, tft.color565(255, 255, 255));  // **模拟半圆外框**
    }

    // **计算填充进度**
    int progressAngle = (temperature * 180) / MAX_TEMP;  // **转换成角度**
    
    for (int angle = 0; angle < progressAngle; angle += 5) {
        float radian = angle * M_PI / 180;
        int x1 = CENTER_X + RADIUS * cos(radian);
        int y1 = CENTER_Y - RADIUS * sin(radian);
        int x2 = CENTER_X + (RADIUS - 5) * cos(radian);
        int y2 = CENTER_Y - (RADIUS - 5) * sin(radian);
        tft.drawLine(x1, y1, x2, y2, tft.color565(255, 0, 0));  // **填充红色温度进度**
    }

    // **显示温度百分比**
    tft.setTextColor(tft.color565(255, 255, 255));
    tft.setTextSize(2);
    tft.setCursor(CENTER_X - 20, CENTER_Y - RADIUS - 20);
    tft.print((temperature * 100) / MAX_TEMP);
    tft.print("%");

    // **更新温度进度**
    temperature += SPEED;
    if (temperature >= MAX_TEMP) {
        temperature = 0;
    }

    delay(100);
}