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/***************************************************************************
* Copyright (C) 2005 by David Saxton *
* david@bluehaze.org *
* *
* 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. *
***************************************************************************/
#include "dpline.h"
#include "libraryitem.h"
#include "resizeoverlay.h"
#include "variant.h"
#include <cmath>
#include <kiconloader.h>
#include <klocale.h>
#include <qpainter.h>
//BEGIN class DPLine
Item* DPLine::construct( ItemDocument *itemDocument, bool newItem, const char *id )
{
return new DPLine( itemDocument, newItem, id );
}
LibraryItem* DPLine::libraryItem()
{
return new LibraryItem(
QString("dp/line"),
i18n("Line"),
i18n("Other"),
KGlobal::iconLoader()->loadIcon( "text", KIcon::Small ),
LibraryItem::lit_drawpart,
DPLine::construct );
}
DPLine::DPLine( ItemDocument *itemDocument, bool newItem, const char *id )
: DrawPart( itemDocument, newItem, id ? id : "line" )
{
m_pLineOverlay = new LineOverlay(this);
m_name = i18n("Line");
m_desc = i18n("Select the line to position the end points");
createProperty( "line-color", Variant::Type::Color );
property("line-color")->setCaption( i18n("Line Color") );
property("line-color")->setValue(Qt::black);
createProperty( "line-width", Variant::Type::Int );
property("line-width")->setCaption( i18n("Line Width") );
property("line-width")->setMinValue(1);
property("line-width")->setMaxValue(1000);
property("line-width")->setValue(1);
createProperty( "line-style", Variant::Type::PenStyle );
property("line-style")->setCaption( i18n("Line Style") );
property("line-style")->setAdvanced(true);
setDataPenStyle( "line-style", Qt::SolidLine );
createProperty( "cap-style", Variant::Type::PenCapStyle );
property("cap-style")->setCaption( i18n("Cap Style") );
property("cap-style")->setAdvanced(true);
setDataPenCapStyle( "cap-style", Qt::FlatCap );
}
DPLine::~DPLine()
{
}
void DPLine::setSelected( bool yes )
{
if ( yes == isSelected() )
return;
DrawPart::setSelected(yes);
m_pLineOverlay->showResizeHandles(yes);
}
void DPLine::dataChanged()
{
setPen( QPen( dataColor("line-color"),
unsigned( dataInt("line-width") ),
getDataPenStyle("line-style"),
getDataPenCapStyle("cap-style"),
Qt::MiterJoin ) );
postResize(); // in case the pen width has changed
update();
}
void DPLine::postResize()
{
int x1 = offsetX();
int y1 = offsetY();
int x2 = x1+width();
int y2 = y1+height();
QPointArray p(4);
int pw = pen().width();
int dx = QABS(x1-x2);
int dy = QABS(y1-y2);
pw = pw*4/3+2; // approx pw*sqrt(2)
int px = x1<x2 ? -pw : pw ;
int py = y1<y2 ? -pw : pw ;
if ( dx && dy && (dx > dy ? (dx*2/dy <= 2) : (dy*2/dx <= 2)) ) {
// steep
if ( px == py ) {
p[0] = QPoint(x1 ,y1+py);
p[1] = QPoint(x2-px,y2 );
p[2] = QPoint(x2 ,y2-py);
p[3] = QPoint(x1+px,y1 );
} else {
p[0] = QPoint(x1+px,y1 );
p[1] = QPoint(x2 ,y2-py);
p[2] = QPoint(x2-px,y2 );
p[3] = QPoint(x1 ,y1+py);
}
} else if ( dx > dy ) {
// horizontal
p[0] = QPoint(x1+px,y1+py);
p[1] = QPoint(x2-px,y2+py);
p[2] = QPoint(x2-px,y2-py);
p[3] = QPoint(x1+px,y1-py);
} else {
// vertical
p[0] = QPoint(x1+px,y1+py);
p[1] = QPoint(x2+px,y2-py);
p[2] = QPoint(x2-px,y2-py);
p[3] = QPoint(x1-px,y1+py);
}
setItemPoints( p, false );
}
void DPLine::drawShape( QPainter & p )
{
int x1 = int(x()+offsetX());
int y1 = int(y()+offsetY());
int x2 = x1+width();
int y2 = y1+height();
p.drawLine( x1, y1, x2, y2 );
}
//END class DPLine
//BEGIN class DPArrow
Item* DPArrow::construct( ItemDocument *itemDocument, bool newItem, const char *id )
{
return new DPArrow( itemDocument, newItem, id );
}
LibraryItem* DPArrow::libraryItem()
{
return new LibraryItem(
QString("dp/arrow"),
i18n("Arrow"),
i18n("Other"),
KGlobal::iconLoader()->loadIcon( "text", KIcon::Small ),
LibraryItem::lit_drawpart,
DPArrow::construct );
}
DPArrow::DPArrow( ItemDocument *itemDocument, bool newItem, const char *id )
: DPLine( itemDocument, newItem, id ? id : "arrow" )
{
m_name = i18n("Arrow");
// We don't want to use the square cap style as it screws up drawing our arrow head
QStringList allowed = property("cap-style")->allowed();
allowed.remove( DrawPart::penCapStyleToName( Qt::SquareCap ) );
property("cap-style")->setAllowed(allowed);
}
DPArrow::~DPArrow()
{
}
void DPArrow::drawShape( QPainter & p )
{
int x1 = int(x()+offsetX());
int y1 = int(y()+offsetY());
int x2 = x1+width();
int y2 = y1+height();
p.drawLine( x1, y1, x2, y2 );
double dx = x2-x1;
double dy = y2-y1;
if ( dx == 0. && dy == 0. )
return;
double pi = 3.14159265358979323846264;
double arrow_angle = ( dx == 0 ? (dy>0?(pi/2.):(-pi/2.)) : std::atan(dy/dx) );
if ( dx < 0 )
arrow_angle += pi;
double head_angle = 0.6; // Angle of arrowhead
double head_length = 10.;
// Position of arrowhead
int x3 = int( x2 + head_length*std::cos( pi + arrow_angle - head_angle ) );
int y3 = int( y2 + head_length*std::sin( pi + arrow_angle - head_angle ) );
int x4 = int( x2 + head_length*std::cos( pi + arrow_angle + head_angle ) );
int y4 = int( y2 + head_length*std::sin( pi + arrow_angle + head_angle ) );
// Draw arrowhead
QPen pen = p.pen();
pen.setCapStyle( Qt::RoundCap );
p.setPen(pen);
p.setBrush(pen.color());
QPointArray pa(3);
pa[0] = QPoint( x2, y2 );
pa[1] = QPoint( x3, y3 );
pa[2] = QPoint( x4, y4 );
p.drawPolygon(pa);
p.drawPolyline(pa);
// p.drawLine( x2, y2, x3, y3 );
// p.drawLine( x2, y2, x4, y4 );
}
//END class DPLine
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