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/***************************************************************************
* Copyright (C) 2003 by Martin Koller *
* m.koller@surfeu.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.h>
#define XY_WIDTH 220
#define MARK_WIDTH 10
//-----------------------------------------------------------------
PosWidget::PosWidget(QWidget *parent, const char *name)
: QWidget(parent, name, WRepaintNoErase), x(0), y(0), trace(false)
{
setMinimumSize(XY_WIDTH, XY_WIDTH);
setMaximumSize(XY_WIDTH, XY_WIDTH);
setPaletteBackgroundColor(Qt::white);
}
//-----------------------------------------------------------------
void PosWidget::paintEvent(QPaintEvent *)
{
QPainter paint(this);
paint.drawRect(0, 0, width(), height());
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 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
eraseOld();
x = newX;
}
//-----------------------------------------------------------------
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
eraseOld();
y = newY;
}
//-----------------------------------------------------------------
void PosWidget::showTrace(bool t)
{
trace = t;
if ( !trace )
{
erase();
update();
}
}
//-----------------------------------------------------------------
void PosWidget::eraseOld()
{
QPainter paint(this);
//paint.eraseRect(x - MARK_WIDTH/2, y - MARK_WIDTH/2, MARK_WIDTH + 1, MARK_WIDTH + 1);
// erase previous cross (don't use eraseRect() so that trace flags will be not destroyed so much)
paint.setPen(Qt::white);
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);
if ( trace ) // show previous position with a smaller black cross
{
paint.setPen(Qt::black);
paint.drawLine(x - 2, y - 2,
x + 2, y + 2);
paint.drawLine(x - 2, y + 2,
x + 2, y - 2);
}
update();
}
//-----------------------------------------------------------------
#include "poswidget.moc"
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