myscalecontrol.cpp

图形软件,用QT编写的,可以用来学习软件的

/*****************************************************************************
*******************************************************************************
**                                                                           **
**    equal III the graphic builder                                          **
**                                                                           **
**    Copyright (C) 2003 Oleksiy Pylypenko                                   **
**                                                                           **
** This file may be distributed and/or modified under the terms of the       **
** GNU General Public License version 2 as published by the Free Software    **
** Foundation and appearing in the file license included in the              **
** packaging of this file.                                                   **
**                                                                           **
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE   **
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. **
**                                                                           **
** Contact [e-mail] if any conditions of this licensing are         **
** not clear to you.                                                         **
**                                                                           **
**                                                                           **
*******************************************************************************
 *****************************************************************************/

#include <qmultilineedit.h>
#include <qlayout.h>
#include <qlabel.h>
#include <qpixmap.h>
#include <qtoolbutton.h>
#include <qvalidator.h>
#include <qapplication.h>
#include <qlabel.h>

#include "myscalecontrol.h"
#include "xpms.h"

void myScaleControl::clear(void){
	top = 10;
	left = -10;
	right = 10;
	bottom = -10;
	setScales();
	update();
}
myScaleControl::myScaleControl( QWidget *parent)
	: QWidget( parent )
{



    QBoxLayout *topLayout = new QVBoxLayout( this , 10 );

    QGridLayout *grid = new QGridLayout( topLayout, 6, 5 );


    wnd_top    = new QLineEdit(this);
	wnd_left   = new QLineEdit(this);
	wnd_right  = new QLineEdit(this);
	wnd_bottom = new QLineEdit(this);

	QDoubleValidator *validator = new QDoubleValidator(this);

	wnd_top->setValidator(validator);
	wnd_left->setValidator(validator);
	wnd_right->setValidator(validator);
	wnd_bottom->setValidator(validator);

	wnd_top->setFixedWidth(50);
	wnd_left->setFixedWidth(50);
	wnd_right->setFixedWidth(50);
	wnd_bottom->setFixedWidth(50);

	this->connect(wnd_top,SIGNAL(returnPressed()),SIGNAL(update()));
	this->connect(wnd_left,SIGNAL(returnPressed()),SIGNAL(update()));
	this->connect(wnd_right,SIGNAL(returnPressed()),SIGNAL(update()));
	this->connect(wnd_bottom,SIGNAL(returnPressed()),SIGNAL(update()));

	grid->addMultiCellWidget( wnd_top, 1, 1, 2, 3, Qt::AlignCenter );
	grid->addMultiCellWidget( wnd_left, 2, 2, 1, 2, Qt::AlignCenter );
	grid->addMultiCellWidget( wnd_right, 2, 2, 3, 4, Qt::AlignCenter );
	grid->addMultiCellWidget( wnd_bottom, 3, 3, 2, 3, Qt::AlignCenter );

	grid->setColStretch(0,100);
	grid->setColStretch(1,1);
	grid->setColStretch(2,1);
	grid->setColStretch(3,1);
	grid->setColStretch(4,1);
	grid->setColStretch(5,100);

	grid->setRowStretch(0,100);
	grid->setRowStretch(1,1);
	grid->setRowStretch(2,1);
	grid->setRowStretch(3,1);
	grid->setRowStretch(4,100);

	topLayout->setStretchFactor(grid,1);

	grid = new QGridLayout(topLayout,5,5,10);
	
	topLayout->setStretchFactor(grid,1);

	QToolButton *abutton;

	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(zoom_in));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushZoomOut()));
	grid->addWidget(abutton,1,3);
	
	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(zoom_out));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushZoomIn()));
	grid->addWidget(abutton,1,1);

	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(up_button));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushUp()));
	grid->addWidget(abutton,1,2);
	
	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(left_button));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushLeft()));
	grid->addWidget(abutton,2,1);
	
	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(right_button));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushRight()));
	grid->addWidget(abutton,2,3);

	abutton = new QToolButton(this);
	abutton->setPixmap(	QPixmap(down_button));
	abutton->setAutoRaise(true);
	abutton->setFocusPolicy(WheelFocus);
	this->connect(abutton,SIGNAL(pressed()),SLOT(pushDown()));
	grid->addWidget(abutton,3,2);

	grid->setRowStretch(0,100);
	grid->setRowStretch(1,1);
	grid->setRowStretch(2,1);
	grid->setRowStretch(3,1);
	grid->setRowStretch(4,100);

	grid->setColStretch(0,100);
	grid->setColStretch(1,1);
	grid->setColStretch(2,1);
	grid->setColStretch(3,1);
	grid->setColStretch(4,100);

	QLabel *l = new QLabel("",this);
	topLayout->addWidget(l);
	topLayout->setStretchFactor(l,2);

	clear();
}


void myScaleControl::setScales(void){
	wnd_top->setText(QString("%1").arg(top));
	wnd_left->setText(QString("%1").arg(left));
	wnd_right->setText(QString("%1").arg(right));
	wnd_bottom->setText(QString("%1").arg(bottom));
}

void myScaleControl::readScales(void){
	top=wnd_top->text().toDouble();
	left=wnd_left->text().toDouble();
	right=wnd_right->text().toDouble();
	bottom=wnd_bottom->text().toDouble();
}

void myScaleControl::pushUp(void){
	readScales();
	
	double d = (top-bottom)/5.;
	bottom += d;top += d;

	setScales();
	update();
}
void myScaleControl::pushDown(void){
	readScales();

	double d = (bottom-top)/5.;
	bottom += d;top += d;
	
	setScales();
	update();
}
void myScaleControl::pushLeft(void){
	readScales();
	
	double d = (left-right)/5.;
	left += d;right += d;

	setScales();
	update();
}
void myScaleControl::pushRight(void)
{
	readScales();
	
	double d = (right-left)/5.;
	left += d;right += d;

	setScales();
	update();
}

void myScaleControl::pushZoomIn(void){
	readScales();
	
	double w = left-right;w/=0.6;
	double h = bottom-top;h/=0.6;
	double cx = (left+right) / 2.;
	double cy = (top+bottom) / 2.;
	right = cx - w / 2.;
	left  = cx + w / 2.;
	top    = cy - h / 2.;
	bottom = cy + h / 2.;

	setScales();
	update();
}
void myScaleControl::pushZoomOut(void){
	readScales();
	
	double w = left-right;w*=0.6;
	double h = bottom-top;h*=0.6;
	double cx = (left+right) / 2.;
	double cy = (top+bottom) / 2.;
	right = cx - w / 2.;
	left  = cx + w / 2.;
	top    = cy - h / 2.;
	bottom = cy + h / 2.;

	setScales();
	update();
}