/***************************************************************************
 *   Copyright (C) 2003,2005,2006 by Martin Koller                         *
 *   kollix@aon.at                                                         *
 *   This file is part of the KDE Control Center Module for Joysticks      *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/
#include "poswidget.h"

#include <QPainter>

#define XY_WIDTH 220
#define MARK_WIDTH 10
#define MAX_POINTS 500

//-----------------------------------------------------------------

PosWidget::PosWidget(QWidget *parent)
    : QWidget(parent)
    , x(0)
    , y(0)
    , trace(false)
{
    setMinimumSize(XY_WIDTH, XY_WIDTH);
    setMaximumSize(XY_WIDTH, XY_WIDTH);

    QPalette palette;
    palette.setColor(backgroundRole(), Qt::white);
    setPalette(palette);
}

//-----------------------------------------------------------------

void PosWidget::paintEvent(QPaintEvent *)
{
    QPainter paint(this);

    // draw a frame
    paint.drawRect(0, 0, width() - 1, height() - 1);
    paint.setPen(Qt::gray);

    // draw a center grid
    paint.drawLine(XY_WIDTH / 2, 1, XY_WIDTH / 2, XY_WIDTH - 2);

    paint.drawLine(1, XY_WIDTH / 2, XY_WIDTH - 2, XY_WIDTH / 2);

    // draw the trace of previous points
    if (trace) {
        paint.setPen(Qt::black);

        for (int i = 0; i < tracePoints.count() - 2; i++)
            paint.drawLine(tracePoints[i], tracePoints[i + 1]);

        if (!tracePoints.isEmpty())
            paint.drawLine(tracePoints[tracePoints.count() - 1], QPoint(x, y));
    }

    // draw the current position marker
    paint.setPen(Qt::blue);

    paint.drawLine(x - MARK_WIDTH / 2, y - MARK_WIDTH / 2, x + MARK_WIDTH / 2, y + MARK_WIDTH / 2);

    paint.drawLine(x - MARK_WIDTH / 2, y + MARK_WIDTH / 2, x + MARK_WIDTH / 2, y - MARK_WIDTH / 2);
}

//-----------------------------------------------------------------

void PosWidget::changeX(int newX)
{
    // transform coordinates from joystick to widget coordinates
    newX = int((newX / 65535.0) * XY_WIDTH + XY_WIDTH / 2);

    if (x == newX)
        return; // avoid unnecessary redraw

    if (trace) {
        tracePoints.append(QPoint(x, y));
        if (tracePoints.count() == MAX_POINTS)
            tracePoints.removeFirst();
    }

    x = newX;
    update();
}

//-----------------------------------------------------------------

void PosWidget::changeY(int newY)
{
    // transform coordinates from joystick to widget coordinates
    newY = int((newY / 65535.0) * XY_WIDTH + XY_WIDTH / 2);

    if (y == newY)
        return; // avoid unnecessary redraw

    if (trace) {
        tracePoints.append(QPoint(x, y));
        if (tracePoints.count() == MAX_POINTS)
            tracePoints.removeFirst();
    }

    y = newY;
    update();
}

//-----------------------------------------------------------------

void PosWidget::showTrace(bool t)
{
    trace = t;
    tracePoints.clear();

    update();
}

//-----------------------------------------------------------------