TouchscreenGrid.cpp

/*
TouchscreenGrid.cpp - Library for touchscreen button functions.
Created by Terence F. Golla, November 9, 2022
Released into the public domain.
*/

#include "TouchscreenGrid.h"

// Constructor
TouchscreenGrid::TouchscreenGrid(unsigned int x, unsigned int y, unsigned int columns, unsigned int rows, 
        unsigned int boxWidth, unsigned int boxHeight, unsigned int tftWidth, unsigned int tftHeight,
        unsigned int rotation)
{
    _x = x;
    _y = y;
    _columns = columns;
    _rows =rows;
    _boxWidth = boxWidth; 
    _boxHeight = boxHeight;
    _tftWidth = tftWidth;
    _tftHeight = tftHeight;
    _rotation = rotation;
}

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

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

    int column = ((adjustedX - _x - 1)/_boxWidth) + 1;

    if (column > _columns)
        column = 0;

    return column;
}

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

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

    int row = ((adjustedY - _y - 1)/_boxHeight) + 1;

    if (row > _rows)
    row = 0;

    return row;
}