QConicalGradient : QPainter « Qt « C++

1. C++
2. Qt
3. QPainter

QConicalGradient

  


Foundations of Qt Development\Chapter07\brushgradients\main.cpp
/*
 * Copyright (c) 2006-2007, Johan Thelin
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice, 
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice,  
 *       this list of conditions and the following disclaimer in the documentation 
 *       and/or other materials provided with the distribution.
 *     * Neither the name of APress nor the names of its contributors 
 *       may be used to endorse or promote products derived from this software 
 *       without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <QApplication>

#include <QPainter>
#include <QBrush>
#include <QPixmap>

void createBrushShot( QBrush brush, QString name )
{
  QPixmap pixmap( 200, 200 );
  pixmap.fill( Qt::white );
  
  QPainter painter( &pixmap );
  
  painter.setBrush( brush );
  painter.drawRect( pixmap.rect() );
  
  pixmap.save( QString("%1.png").arg( name ) );
}

int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  
  QLinearGradient linGrad( QPointF(80, 80), QPoint( 120, 120 ) );
  linGrad.setColorAt( 0, Qt::black );
  linGrad.setColorAt( 1, Qt::white );
    
  linGrad.setSpread( QGradient::PadSpread );
  createBrushShot( QBrush( linGrad ), "LinearPad" );
  linGrad.setSpread( QGradient::RepeatSpread );
  createBrushShot( QBrush( linGrad ), "LinearRepeat" );
  linGrad.setSpread( QGradient::ReflectSpread );
  createBrushShot( QBrush( linGrad ), "LinearReflect" );  

  QRadialGradient radGrad( QPointF(100, 100), 30 );
  radGrad.setColorAt( 0, Qt::black );
  radGrad.setColorAt( 1, Qt::white );
  
  radGrad.setSpread( QGradient::PadSpread );
  createBrushShot( QBrush( radGrad ), "RadialPad" );
  radGrad.setSpread( QGradient::RepeatSpread );
  createBrushShot( QBrush( radGrad ), "RadialRepeat" );
  radGrad.setSpread( QGradient::ReflectSpread );
  createBrushShot( QBrush( radGrad ), "RadialReflect" );
  
  QConicalGradient conGrad( QPointF(100, 100), -45.0 );
  conGrad.setColorAt( 0, Qt::black );
  conGrad.setColorAt( 1, Qt::white );
  
  conGrad.setSpread( QGradient::PadSpread );
  createBrushShot( QBrush( conGrad ), "ConicalPad" );
  conGrad.setSpread( QGradient::RepeatSpread );
  createBrushShot( QBrush( conGrad ), "ConicalRepeat" );
  conGrad.setSpread( QGradient::ReflectSpread );
  createBrushShot( QBrush( conGrad ), "ConicalReflect" );
  
  QBrush textureBrush( QImage("texture.png") );
  createBrushShot( textureBrush, "TextureBrush" );
  
  return 0;
}

   
    
  

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