TouchscreenButton.cpp

/*
TouchscreenButton.cpp - Library for touchscreen button functions.
Created by Terence F. Golla, September 19, 2021
Released into the public domain.
*/

#include "TouchscreenButton.h"

// Constructor
TouchscreenButton::TouchscreenButton(unsigned int x, unsigned int y, 
    unsigned int width, unsigned int height, unsigned int tftWidth, unsigned int tftHeight,
    unsigned int rotation, char *imageFilename,char *alternateImageFilename)
{
    _x = x; // Horizontal offset.
    _y = y; // Vertical offset.
    _width = width; 
    _height = height;
    _tftWidth = tftWidth;
    _tftHeight = tftHeight;
    _rotation = rotation;
    _imageFilename = imageFilename;
    _alternateImageFilename = alternateImageFilename;
}

void TouchscreenButton::Display(Adafruit_ImageReader &reader, Adafruit_SPITFT &tft)
{
    ImageReturnCode stat = reader.drawBMP(_imageFilename, tft, _x, _y);
}

void TouchscreenButton::DisplayAlternate(Adafruit_ImageReader &reader, Adafruit_SPITFT &tft)
{
    ImageReturnCode stat = reader.drawBMP(_alternateImageFilename, tft, _x, _y);
}

boolean TouchscreenButton::Touched(unsigned int x, unsigned int y)
{
    // Adjust for the fact that the touch coordinates do not rotate like the image.
    unsigned int adjustedX;
    unsigned int adjustedY;

    switch (_rotation)
    {
    case 1: 
        adjustedX = _tftWidth - y;
        adjustedY = x;   
        break; 
    case 2:
        adjustedX = x;
        adjustedY = y;  
        break;
    case 3:
        adjustedX = y;
        adjustedY = _tftHeight - x;  
        break;
    case 4:
        adjustedX = _tftWidth - y;
        adjustedY = _tftHeight - x;  
        break;   
    }

#if DebugTouchscreenButton
    Serial.print(adjustedX);
    Serial.print("-");
    Serial.println(adjustedY);
#endif

    if (adjustedX < _x || adjustedX > (_x + _width - 1)) 
    {
        return false;
    }

    if (adjustedY < _y || adjustedY > (_y + _height - 1)) 
    {
        return false;
    }

    return true;
}