screen_calibrate.c

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/**************************************************************************************************************************************
* Project:       discoverpixy
* Website:       https://github.com/t-moe/discoverpixy
* Authors:       Aaron Schmocker, Timo Lang
* Institution:   BFH Bern University of Applied Sciences
* File:          common/touch/screen_calibrate.c
*
* Version History:
* Date          Autor Email         SHA     Changes
* 2015-06-01    timolang@gmail.com  06227da Added calibrate screen (WIP). fixed bug in emulator drawing.
* 2015-06-01    timolang@gmail.com  eb573bc Finalized calibration. Fixed a bug in screen module.
*
**************************************************************************************************************************************/

#include "screen_calibrate.h"
#include "tft.h"
#include "touch.h"


extern volatile bool calibration; //from touch.c


static void enter(void* screen)
{
    tft_clear(BLACK);
}

static void leave(void* screen)
{

}

static void update(void* screen)
{
    int x1, y1, x2, y2, dx, dy;


    tft_print_line(50, 50, WHITE, BLACK, 1, "Calibration:");
    tft_print_line(50, 120, WHITE, BLACK, 0, "Hit the markers exactly!");
    //-----------------First Point--------------------
    tft_draw_line(CCENTER, CBEGIN, CCENTER, CEND, WHITE);   //Draw Cross
    tft_draw_line(CBEGIN, CCENTER, CEND, CCENTER, WHITE);   //Draw Cross
    calibration = 1; //TouchX + TouchY Values will not be converted to Pixels

    while (calibration);    //Wait on PenUp

    POINT_STRUCT p1 = touch_get_last_point();
    x1 = p1.x;
    y1 = p1.y;
    tft_fill_rectangle(CBEGIN, CBEGIN, CEND, CEND, BLACK); //Clear Cross

    //-----------------Second Point-------------------
    tft_draw_line(DWIDTH - CCENTER, DHEIGHT - CBEGIN, DWIDTH - CCENTER, DHEIGHT - CEND, WHITE);
    tft_draw_line(DWIDTH - CBEGIN, DHEIGHT - CCENTER, DWIDTH - CEND, DHEIGHT - CCENTER, WHITE);
    calibration = 1;

    while (calibration);

    POINT_STRUCT p2 = touch_get_last_point();
    x2 = p2.x;
    y2 = p2.y;
    tft_fill_rectangle(DWIDTH - CBEGIN, DHEIGHT - CBEGIN, DWIDTH - CEND, DHEIGHT - CEND, BLACK);

    //-----------------Third Point--------------------
    tft_draw_line(CCENTER, DHEIGHT - CBEGIN, CCENTER, DHEIGHT - CEND, WHITE);
    tft_draw_line(CBEGIN, DHEIGHT - CCENTER, CEND, DHEIGHT - CCENTER, WHITE);
    calibration = 1;

    while (calibration);

    POINT_STRUCT p3 = touch_get_last_point();
    x1 += p3.x; //Add(!) values. We'll build the average later
    y2 += p3.y;
    tft_fill_rectangle(CBEGIN, DHEIGHT - CBEGIN, CEND, DHEIGHT - CEND, BLACK);

    //------------------4. Point---------------------
    tft_draw_line(DWIDTH - CCENTER, CBEGIN, DWIDTH - CCENTER, CEND, WHITE);
    tft_draw_line(DWIDTH - CBEGIN, CCENTER, DWIDTH - CEND, CCENTER, WHITE);
    calibration = 1;

    while (calibration);

    POINT_STRUCT p4 = touch_get_last_point();
    x2 += p4.x;
    y1 += p4.y;
    tft_fill_rectangle(DWIDTH - CBEGIN, CBEGIN, DWIDTH - CEND, CEND, BLACK);
    //-------------------Calculation---------------------
    x1++; //Add 1 and divide by 2 later = +0.5 (for correct rounding)
    y1++;
    x2++;
    y2++;
    x1 >>= 1; //Divide by 2
    y1 >>= 1;
    x2 >>= 1;
    y2 >>= 1;
    dx = (x2 - x1); //Build the Difference
    dy = (y2 - y1);

    touch_set_calibration_values(x1, dx, y1, dy);
    tft_print_line(50, 120, WHITE, BLACK, 0, "Calibration Done. Press anywhere");

    calibration = 1;

    while (calibration);

    gui_screen_back();

}


static SCREEN_STRUCT screen = {
    enter,
    leave,
    update
};


SCREEN_STRUCT* get_screen_calibrate()
{
    return &screen;
}