[Kstars-devel] KDE/kdeedu/kstars/kstars/skycomponents

[Jason Harris]

SVN commit 849413 by harris:

Committing patch from Mederic to implement fading solar system trails with 
transparency instead of interpolating the color to SkyColor.  This will make faded 
trails look correct when passing by the Milky Way.

Added his changes to SolarSystemListComponent, as well as 
SolarSystemSingleComponent, so comets and asteroids can enjoy the new trails too 
:)

CCMAIL: kstars-devel at kde.org



 M  +2 -9      solarsystemlistcomponent.cpp  
 M  +2 -9      solarsystemsinglecomponent.cpp  


--- trunk/KDE/kdeedu/kstars/kstars/skycomponents/solarsystemlistcomponent.cpp #849412:849413
@@ -117,9 +117,6 @@
     float Width = map->scale() * map->width();
     float Height = map->scale() * map->height();
 
-    QColor tcolor1 = QColor( data->colorScheme()->colorNamed( "PlanetTrailColor" ) );
-    QColor tcolor2 = QColor( data->colorScheme()->colorNamed( "SkyColor" ) );
-
     foreach ( SkyObject *obj, m_TrailList ) {
         //DEBUG
         kDebug() << obj->name() << endl;
@@ -139,17 +136,13 @@
             doDrawLine = true;
         }
 
-        psky.setPen( QPen( tcolor1, 1 ) );
         bool firstPoint( true );
+        QColor tcolor = QColor( data->colorScheme()->colorNamed( "PlanetTrailColor" ) );
         foreach ( p, ksp->trail() ) {
             if ( firstPoint ) { firstPoint = false; continue; } //skip first point
 
             if ( Options::fadePlanetTrails() ) {
-                //Define interpolated color
-                QColor tcolor = QColor(
-                                    (i*tcolor1.red()   + (n-i)*tcolor2.red())/n,
-                                    (i*tcolor1.green() + (n-i)*tcolor2.green())/n,
-                                    (i*tcolor1.blue()  + (n-i)*tcolor2.blue())/n );
+                tcolor.setAlphaF(static_cast<qreal>(i)/static_cast<qreal>(n));
                 ++i;
                 psky.setPen( QPen( tcolor, 1 ) );
             }
--- trunk/KDE/kdeedu/kstars/kstars/skycomponents/solarsystemsinglecomponent.cpp #849412:849413
@@ -183,9 +183,6 @@
     float Width = map->scale() * map->width();
     float Height = map->scale() * map->height();
 
-    QColor tcolor1 = QColor( data->colorScheme()->colorNamed( "PlanetTrailColor" ) );
-    QColor tcolor2 = QColor( data->colorScheme()->colorNamed( "SkyColor" ) );
-
     SkyPoint p = ksp()->trail().first();
     QPointF o = map->toScreen( &p );
     QPointF oLast( o );
@@ -200,17 +197,13 @@
         doDrawLine = true;
     }
 
-    psky.setPen( QPen( tcolor1, 1 ) );
     bool firstPoint( true );
+    QColor tcolor = QColor( data->colorScheme()->colorNamed( "PlanetTrailColor" ) );
     foreach ( p, ksp()->trail() ) {
         if ( firstPoint ) { firstPoint = false; continue; } //skip first point
 
         if ( Options::fadePlanetTrails() ) {
-            //Define interpolated color
-            QColor tcolor = QColor(
-                                (i*tcolor1.red()   + (n-i)*tcolor2.red())/n,
-                                (i*tcolor1.green() + (n-i)*tcolor2.green())/n,
-                                (i*tcolor1.blue()  + (n-i)*tcolor2.blue())/n );
+            tcolor.setAlphaF(static_cast<qreal>(i)/static_cast<qreal>(n));
             ++i;
             psky.setPen( QPen( tcolor, 1 ) );
         }