[Kstars-devel] [kstars] kstars: _Quickfix_ to enable inversion of colors in the Image Viewer. This is

[Akarsh Simha]

Git commit 589d993b63a545c6e49361f5c636bd0a4ff640f2 by Akarsh Simha.
Committed on 19/04/2012 at 10:22.
Pushed by asimha into branch 'master'.

_Quickfix_ to enable inversion of colors in the Image Viewer. This is
important as it enhances contrast, making it easy to view the galaxies
under low-light conditions.

This should be redone in a more elegant way, adding more options, but
this is a quick feature for now. If there are any objections, do feel
free to revert / discuss them.

I almost did this because I needed it right away.

CCMAIL: kstars-devel at kde.org

M  +21   -2    kstars/imageviewer.cpp
M  +5    -2    kstars/imageviewer.h

http://commits.kde.org/kstars/589d993b63a545c6e49361f5c636bd0a4ff640f2

diff --git a/kstars/imageviewer.cpp b/kstars/imageviewer.cpp
index f7b7b51..8ef8c4e 100644
--- a/kstars/imageviewer.cpp
+++ b/kstars/imageviewer.cpp
@@ -69,10 +69,17 @@ ImageViewer::ImageViewer (const KUrl &url, const QString &capText, QWidget *pare
 {
     init(url.fileName(), capText);
     // Add save button
-    setButtons( KDialog::User1 | KDialog::Close );
+    setButtons( KDialog::User2 | KDialog::User1 | KDialog::Close );
+
     KGuiItem saveButton( i18n("Save"), "document-save", i18n("Save the image to disk") );
     setButtonGuiItem( KDialog::User1, saveButton );
+
+    // FIXME: Add more options, and do this more nicely
+    KGuiItem invertButton( i18n("Invert colors"), "", i18n("Reverse colors of the image. This is useful to enhance contrast at times. This affects only the display and not the saving.") );
+    setButtonGuiItem( KDialog::User2, invertButton );
+
     connect( this, SIGNAL( user1Clicked() ), this, SLOT ( saveFileToDisc() ) );
+    connect( this, SIGNAL( user2Clicked() ), this, SLOT ( invertColors() ) );
     // check URL
     if (!m_ImageUrl.isValid())
         kDebug() << "URL is malformed: " << m_ImageUrl;
@@ -101,7 +108,13 @@ void ImageViewer::init(QString caption, QString capText) {
     setAttribute( Qt::WA_DeleteOnClose, true );
     setModal( false );
     setCaption( i18n( "KStars image viewer" ) + QString( " : " ) + caption );
-    setButtons( KDialog::Close );
+    setButtons( KDialog::Close | KDialog::User1);
+
+    // FIXME: Add more options, and do this more nicely
+    KGuiItem invertButton( i18n("Invert colors"), "", i18n("Reverse colors of the image. This is useful to enhance contrast at times. This affects only the display and not the saving.") );
+    setButtonGuiItem( KDialog::User1, invertButton );
+    connect( this, SIGNAL( user1Clicked() ), this, SLOT ( invertColors() ) );
+
 
     // Create widget
     QFrame* page = new QFrame( this );
@@ -245,4 +258,10 @@ void ImageViewer::saveFile (KUrl &url) {
     }
 }
 
+void ImageViewer::invertColors() {
+    // Invert colors
+    m_View->m_Image.invertPixels();
+    m_View->update();
+}
+
 #include "imageviewer.moc"
diff --git a/kstars/imageviewer.h b/kstars/imageviewer.h
index 0fc8608..4466109 100644
--- a/kstars/imageviewer.h
+++ b/kstars/imageviewer.h
@@ -37,10 +37,10 @@ public:
     ~ImageLabel();
     void setImage( const QImage &img ) { m_Image = img; }
 
+    QImage m_Image; // ImageViewer needs access to the image in order to modify it
 protected:
     void paintEvent( QPaintEvent *e);
-private:
-    QImage m_Image;
+
 };
 
 /**@class ImageViewer
@@ -101,6 +101,9 @@ private slots:
 
     /**Saves file to disc. */
     void saveFileToDisc();
+
+    /** Inverts colors **/
+    void invertColors();
 };
 
 #endif