File content as of revision 4:a73760d09423:

/*
 *  Copyright 2014 Embedded Artists AB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


#include "mbed.h"
#include "AppTouchCalibration.h"
#include "lpc_swim_font.h"

/******************************************************************************
 * Defines and typedefs
 *****************************************************************************/
 
#define BTN_WIDTH  65
#define BTN_HEIGHT 40
#define BTN_OFF    20

/******************************************************************************
 * Global variables
 *****************************************************************************/


/******************************************************************************
 * Private functions
 *****************************************************************************/

static void buttonClicked(uint32_t x)
{
  bool* done = (bool*)x;
  *done = true;
}

void AppTouchCalibration::draw()
{
    // Prepare fullscreen
    swim_window_open(_win, 
                   _disp->width(), _disp->height(),         // full size
                   (COLOR_T*)_fb,
                   0,0,_disp->width()-1, _disp->height()-1, // window position and size
                   1,                                       // border
                   WHITE, WHITE, BLACK);                    // colors: pen, backgr, forgr
    swim_set_title(_win, "Touch Calibration", BLACK);
    
    // Prepare status area in the middle
    swim_window_open(_msg, 
                     _disp->width(), _disp->height(),             // full size
                     (COLOR_T*)_fb,
                     50,_disp->height()/2-15,_disp->width()-50, _disp->height()/2+15, // window position and size
                     0,                                           // border
                     BLACK, WHITE, BLACK);                        // colors: pen, backgr, forgr

    showStatus("Press the crosshairs in each of the corners");
    
    // Create (but don't show) the button
    _btn = new Button("Done", _win->fb, _win->xpmax - BTN_OFF - BTN_WIDTH, _win->ypmax - BTN_OFF - BTN_HEIGHT, BTN_WIDTH, BTN_HEIGHT);
}

void AppTouchCalibration::drawMarker(uint16_t x, uint16_t y, bool erase)
{
    // The markers must be drawn at exact locations to get a good calibration.
    // However the lpc_swim functions take the window's title bar into
    // consideration which will move them. To combat this the marker's
    // coordinates will have to be moved    
    x -= _win->xpvmin;
    y -= _win->ypvmin;
    
    swim_set_pen_color(_win, (erase ? _win->bkg : BLACK));
    swim_put_line(_win, x-15, y, x+15, y);
    swim_put_line(_win, x, y-15, x, y+15);
    swim_put_circle(_win, x, y, 10, false);    
}

bool AppTouchCalibration::calibrate()
{
    bool morePoints = true;
    bool lastPoint = false;
    uint16_t x, y;
    int point = 0;
    
    do {
        if (_touch->calibrateStart() != TouchPanel::TouchError_Ok) {
            showStatus("Failed to start calibration\n");
            break;
        }  
        while (morePoints) {
            if (point++ > 0) {
                // erase old location
                drawMarker(x, y, true);
            }
            if (_touch->getNextCalibratePoint(&x, &y, &lastPoint) != TouchPanel::TouchError_Ok) {
                showStatus("Failed to get calibration point\n");
                break;
            }
            drawMarker(x, y, false);
            if (lastPoint) {
                showStatus("Last calibration point. After this the data will");
                showStatus("be saved, which can take a couple of seconds!", 1);
            }
            if (_touch->waitForCalibratePoint(&morePoints, 0) != TouchPanel::TouchError_Ok) {
                showStatus("Failed to get user click\n");
                break;
            }
        }
        if (morePoints) {
            // aborted calibration due to error(s)
            break;
        }

        // erase old location
        drawMarker(x, y, true);
    } while(0);
    
    return !morePoints;
}

void AppTouchCalibration::showStatus(const char* message, int line)
{
    if (line == 0) {
        swim_clear_screen(_msg, _msg->bkg);
        swim_put_text_centered_win(_msg, message, 0);
    } else {
        swim_put_text_centered_win(_msg, message, line*swim_get_font_height(_msg));
    }
    DMBoard::instance().logger()->printf("[CALIB] %s\n", message);
}

/******************************************************************************
 * Public functions
 *****************************************************************************/

AppTouchCalibration::AppTouchCalibration() : _disp(NULL), _touch(NULL), _win(NULL), _fb(NULL), _btn(NULL)
{
}

AppTouchCalibration::~AppTouchCalibration()
{
    teardown();
}

bool AppTouchCalibration::setup()
{
    _disp = DMBoard::instance().display();
    _touch = DMBoard::instance().touchPanel();
    _win = (SWIM_WINDOW_T*)malloc(sizeof(SWIM_WINDOW_T));
    _msg = (SWIM_WINDOW_T*)malloc(sizeof(SWIM_WINDOW_T));
    _fb = _disp->allocateFramebuffer();

    return (_win != NULL && _msg != NULL && _fb != NULL);
}

void AppTouchCalibration::runToCompletion()
{
    // Alternative 1: use the calling thread's context to run in
    bool done = false;
    draw();
    _btn->setAction(buttonClicked, (uint32_t)&done);
    void* oldFB = _disp->swapFramebuffer(_fb);
    
    // Run calibration
    if (calibrate()) {
        showStatus("Calibration Completed. Test to draw!");
        _btn->draw();
    } else {
        // Something went wrong. The error is already shown!
        // Without touch there is no point in continuing, ask
        // user to reset.
        
        swim_put_text_centered_win(_win, "Without touch there is nothing to do. Press RESET !", 2*_disp->height()/3);
        while(1) {
            Thread::wait(5000);
        }
    }
    
    // Allow user to draw. Exit by pressing button
    swim_set_pen_color(_win, BLACK);
    TouchPanel::touchCoordinate_t coord;
    while(!done) {
      if (_touch->read(coord) == TouchPanel::TouchError_Ok) {
        if (coord.z > 0) {
            //swim_put_pixel(_win, coord.x, coord.y);
            swim_put_box(_win, coord.x-1, coord.y-1, coord.x+1, coord.y+1);
        }
        if (_btn->handle(coord.x, coord.y, coord.z > 0)) {
            _btn->draw();
        }
      }
    }
    
    // User has clicked the button, restore the original FB
    _disp->swapFramebuffer(oldFB);
    swim_window_close(_win);
    swim_window_close(_msg);
}

bool AppTouchCalibration::teardown()
{
    if (_win != NULL) {
        free(_win);
        _win = NULL;
    }
    if (_msg != NULL) {
        free(_msg);
        _msg = NULL;
    }
    if (_fb != NULL) {
        free(_fb);
        _fb = NULL;
    }
    if (_btn != NULL) {
        delete _btn;
        _btn = NULL;
    }
    return true;
}