m5stack-dashboard/src/icons/icons.h

#pragma once
#include <M5Stack.h>
#include "theme.h"

// Icons drawn procedurally with M5Stack graphics primitives instead of
// stored RGB565 bitmaps, to keep flash usage small.
namespace Icons {

inline void drawSun(int cx, int cy, int r) {
    M5.Lcd.fillCircle(cx, cy, r, Theme::ACCENT_SUN);
    for (int i = 0; i < 8; i++) {
        float angle = i * (PI / 4.0);
        int x1 = cx + cos(angle) * (r + 4);
        int y1 = cy + sin(angle) * (r + 4);
        int x2 = cx + cos(angle) * (r + 10);
        int y2 = cy + sin(angle) * (r + 10);
        M5.Lcd.drawLine(x1, y1, x2, y2, Theme::ACCENT_SUN);
    }
}

inline void drawMoon(int cx, int cy, int r) {
    M5.Lcd.fillCircle(cx, cy, r, Theme::TEXT_DIM);
    M5.Lcd.fillCircle(cx + r / 2, cy - r / 3, r, Theme::BG);
}

inline void drawCloud(int cx, int cy, int scale, uint16_t color = Theme::TEXT_DIM) {
    M5.Lcd.fillCircle(cx - scale, cy, scale, color);
    M5.Lcd.fillCircle(cx + scale, cy, scale, color);
    M5.Lcd.fillCircle(cx, cy - scale / 2, scale + 2, color);
    M5.Lcd.fillRect(cx - scale, cy, scale * 2, scale, color);
}

inline void drawRainDrops(int cx, int cy, int count = 3) {
    for (int i = 0; i < count; i++) {
        int x = cx - (count - 1) * 5 + i * 10;
        M5.Lcd.drawLine(x, cy, x - 3, cy + 8, Theme::ACCENT_RAIN);
    }
}

// Lightning bolt used for thunderstorm icon.
inline void drawLightningBolt(int cx, int cy, int size, uint16_t color = Theme::ACCENT_STORM) {
    int x0 = cx + size / 4, y0 = cy - size;
    int x1 = cx - size / 3, y1 = cy;
    int x2 = cx, y2 = cy;
    int x3 = cx - size / 6, y3 = cy + size;
    M5.Lcd.drawLine(x0, y0, x1, y1, color);
    M5.Lcd.drawLine(x1, y1, x2, y2, color);
    M5.Lcd.drawLine(x2, y2, x3, y3, color);
    M5.Lcd.drawLine(x0 + 1, y0, x1 + 1, y1, color);
    M5.Lcd.drawLine(x1 + 1, y1, x2 + 1, y2, color);
}

// Thunderstorm: dark cloud + bolt, visually distinct from plain "bewoelkt".
inline void drawThunderstorm(int cx, int cy, int scale) {
    drawCloud(cx, cy - scale / 3, scale, Theme::TEXT_DIM);
    drawLightningBolt(cx, cy + scale / 2, scale, Theme::ACCENT_STORM);
}

// symbol: e.g. "mo____" (clear/night), "mb____" (cloudy/night), "wb____"
// (cloudy/day). description used as secondary signal to catch "Gewitter".
inline void drawWeatherIcon(const String &symbol, const String &description, int cx, int cy, int r = 20) {
    bool isNight = symbol.length() > 0 && symbol.charAt(0) == 'm';
    char condition = symbol.length() > 1 ? symbol.charAt(1) : 'o';
    bool isThunder = (condition == 't') || (description.indexOf("Gewitter") >= 0);

    if (isThunder) {
        drawThunderstorm(cx, cy, r * 2 / 3);
        return;
    }

    switch (condition) {
        case 'o':
            if (isNight) drawMoon(cx, cy, r);
            else drawSun(cx, cy, r);
            break;
        case 'b':
            drawCloud(cx, cy, r * 2 / 3);
            break;
        case 'r':
            drawCloud(cx, cy - 5, r * 2 / 3);
            drawRainDrops(cx, cy + r / 2, 3);
            break;
        default:
            drawCloud(cx, cy, r * 2 / 3);
            break;
    }
}

inline void drawWeatherIcon(const String &symbol, int cx, int cy, int r = 20) {
    drawWeatherIcon(symbol, String(""), cx, cy, r);
}

inline void drawRainWarning(int cx, int cy) {
    M5.Lcd.fillTriangle(cx, cy - 8, cx - 6, cy + 6, cx + 6, cy + 6, Theme::ACCENT_RAIN);
    M5.Lcd.fillCircle(cx, cy + 2, 2, Theme::BG);
}

inline void drawUBahnBadge(int x, int y, int w, int h) {
    M5.Lcd.fillRoundRect(x, y, w, h, 4, Theme::ACCENT_UBAHN);
    M5.Lcd.setTextColor(Theme::TEXT, Theme::ACCENT_UBAHN);
    M5.Lcd.setCursor(x + w / 2 - 4, y + h / 2 - 4);
    M5.Lcd.print("U");
}

inline void drawSBahnBadge(int x, int y, int w, int h) {
    M5.Lcd.fillRoundRect(x, y, w, h, 4, Theme::ACCENT_SBAHN);
    M5.Lcd.setTextColor(Theme::TEXT, Theme::ACCENT_SBAHN);
    M5.Lcd.setCursor(x + w / 2 - 4, y + h / 2 - 4);
    M5.Lcd.print("S");
}

// Proper calendar icon (rounded body, header bar, binder rings, day-dot),
// replacing the earlier checkbox-style placeholder.
inline void drawCalendarIcon(int cx, int cy, int size) {
    int x = cx - size / 2;
    int y = cy - size / 2;

    M5.Lcd.fillRoundRect(x, y, size, size, 3, Theme::BG);
    M5.Lcd.drawRoundRect(x, y, size, size, 3, Theme::ACCENT_CALENDAR);

    int headerH = size / 3;
    M5.Lcd.fillRect(x + 1, y + 1, size - 2, headerH, Theme::ACCENT_CALENDAR);

    M5.Lcd.fillRect(x + size / 4 - 1, y - 2, 2, 4, Theme::ACCENT_CALENDAR);
    M5.Lcd.fillRect(x + size * 3 / 4 - 1, y - 2, 2, 4, Theme::ACCENT_CALENDAR);

    M5.Lcd.fillCircle(cx, y + headerH + (size - headerH) / 2, 2, Theme::TEXT);
}

inline void drawRetryIcon(int cx, int cy, int r) {
    M5.Lcd.drawCircle(cx, cy, r, Theme::ACCENT_ERROR);
    M5.Lcd.setTextColor(Theme::ACCENT_ERROR, Theme::BG);
    M5.Lcd.setCursor(cx - 3, cy - 8);
    M5.Lcd.print("!");
}

} // namespace Icons