Class: ImageComposer

Inherits:
Qt::Widget show all
Defined in:
ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb

Overview

** ** Copyright © 2004-2006 Trolltech AS. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** www.trolltech.com/products/qt/opensource.html ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** www.trolltech.com/products/qt/licensing.html or contact the ** sales department at [email protected]. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. **

** Translated to QtRuby by Richard Dale

Constant Summary collapse

@@resultSize = 
Qt::Size.new(200, 200)

Instance Method Summary collapse

Methods inherited from Qt::Widget

#raise

Methods inherited from Qt::Base

#%, #&, #*, #**, #+, #-, #-@, #/, #<, #<<, #<=, #==, #>, #>=, #>>, #QCOMPARE, #QEXPECT_FAIL, #QFAIL, #QSKIP, #QTEST, #QVERIFY, #QVERIFY2, #QWARN, #^, ancestors, #is_a?, #methods, private_slots, #protected_methods, #public_methods, q_classinfo, q_signal, q_slot, signals, #singleton_methods, slots, #|, #~

Constructor Details

#initialize ⇒ ImageComposer

Returns a new instance of ImageComposer.



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 32

def initialize()
    super()

    @sourceButton = Qt::ToolButton.new
    @sourceButton.iconSize = @@resultSize

    @operatorComboBox = Qt::ComboBox.new
    addOp(Qt::Painter::CompositionMode_SourceOver, tr("SourceOver"))
    addOp(Qt::Painter::CompositionMode_DestinationOver, tr("DestinationOver"))
    addOp(Qt::Painter::CompositionMode_Clear, tr("Clear"))
    addOp(Qt::Painter::CompositionMode_Source, tr("Source"))
    addOp(Qt::Painter::CompositionMode_Destination, tr("Destination"))
    addOp(Qt::Painter::CompositionMode_SourceIn, tr("SourceIn"))
    addOp(Qt::Painter::CompositionMode_DestinationIn, tr("DestinationIn"))
    addOp(Qt::Painter::CompositionMode_SourceOut, tr("SourceOut"))
    addOp(Qt::Painter::CompositionMode_DestinationOut, tr("DestinationOut"))
    addOp(Qt::Painter::CompositionMode_SourceAtop, tr("SourceAtop"))
    addOp(Qt::Painter::CompositionMode_DestinationAtop, tr("DestinationAtop"))
    addOp(Qt::Painter::CompositionMode_Xor, tr("Xor"))

    @destinationButton = Qt::ToolButton.new
    @destinationButton.iconSize = @@resultSize

    @equalLabel = Qt::Label.new(tr("="))

    @resultLabel = Qt::Label.new
    @resultLabel.minimumWidth = @@resultSize.width()

    connect(@sourceButton, SIGNAL(:clicked), self, SLOT(:chooseSource))
    connect(@operatorComboBox, SIGNAL('activated(int)'),
            self, SLOT('recalculateResult()'))
    connect(@destinationButton, SIGNAL(:clicked),
            self, SLOT(:chooseDestination))

    self.layout = Qt::GridLayout.new do |m|
        m.addWidget(@sourceButton, 0, 0, 3, 1)
        m.addWidget(@operatorComboBox, 1, 1)
        m.addWidget(@destinationButton, 0, 2, 3, 1)
        m.addWidget(@equalLabel, 1, 3)
        m.addWidget(@resultLabel, 0, 4, 3, 1)
        m.sizeConstraint = Qt::Layout::SetFixedSize
    end

    @resultImage = Qt::Image.new(@@resultSize, Qt::Image::Format_ARGB32_Premultiplied)

    @sourceImage = Qt::Image.new
    @destinationImage = Qt::Image.new

    loadImage(":/images/butterfly.png", @sourceImage, @sourceButton)
    loadImage(":/images/checker.png", @destinationImage, @destinationButton)


    setWindowTitle(tr("Image Composition"))
end

Instance Method Details

#addOp(mode, name) ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 113

def addOp(mode, name)
    @operatorComboBox.addItem(name, Qt::Variant.new(mode.to_i))
end

#chooseDestination ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 91

def chooseDestination()
    chooseImage(tr("Choose Destination Image"), @destinationImage,
                @destinationButton)
end

#chooseImage(title, image, button) ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 117

def chooseImage(title, image, button)
    fileName = Qt::FileDialog.getOpenFileName(self, title)
    if !fileName.nil?
        loadImage(fileName, image, button)
    end
end

#chooseSource ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 87

def chooseSource()
    chooseImage(tr("Choose Source Image"), @sourceImage, @sourceButton)
end

#currentMode ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 144

def currentMode()
    return @operatorComboBox.itemData(@operatorComboBox.currentIndex()).to_i
end

#imagePos(image) ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 148

def imagePos(image)
    return Qt::Point.new((@@resultSize.width() - image.width()) / 2,
                  (@@resultSize.height() - image.height()) / 2)
end

#loadImage(fileName, image, button) ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 124

def loadImage(fileName, image, button)
    image.load(fileName)

    fixedImage = Qt::Image.new(@@resultSize, Qt::Image::Format_ARGB32_Premultiplied)
    painter = Qt::Painter.new(fixedImage)
    painter.compositionMode = Qt::Painter::CompositionMode_Source
    painter.fillRect(fixedImage.rect(), Qt::Brush.new(Qt::transparent))
    painter.compositionMode = Qt::Painter::CompositionMode_SourceOver
    painter.drawImage(imagePos(image), image)
    painter.end
    button.icon = Qt::Icon.new(Qt::Pixmap.fromImage(fixedImage))

#       The 'QImage::operator=()' method to use as an assignment isn't easily called
#       in QtRuby, so use the convenience method Qt::Image.fromImage() instead
#       image = fixedImage
    image.fromImage(fixedImage)

    recalculateResult()
end

#recalculateResult ⇒ Object 



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# File 'ext/ruby/qtruby/examples/painting/imagecomposition/imagecomposer.rb', line 96

def recalculateResult()
    mode = currentMode()

    painter = Qt::Painter.new(@resultImage)
    painter.compositionMode = Qt::Painter::CompositionMode_Source
    painter.fillRect(@resultImage.rect(), Qt::Brush.new(Qt::transparent))
    painter.compositionMode = Qt::Painter::CompositionMode_SourceOver
    painter.drawImage(0, 0, @destinationImage)
    painter.compositionMode = mode
    painter.drawImage(0, 0, @sourceImage)
    painter.compositionMode = Qt::Painter::CompositionMode_DestinationOver
    painter.fillRect(@resultImage.rect(), Qt::Brush.new(Qt::white))
    painter.end

    @resultLabel.pixmap = Qt::Pixmap.fromImage(@resultImage)
end