How to use

dispose

method

in

org.pentaho.di.core.gui.GCInterface

public void buildTransformationImage() {
 Point max = transMeta.getMaximum();
 Point thumb = getThumb( area, max );
 offset = getOffset( thumb, area );
 // First clear the image in the background color
 gc.setBackground( EColor.BACKGROUND );
 gc.fillRectangle( 0, 0, area.x, area.y );
 // If there is a shadow, we draw the transformation first with an alpha setting
 //
 if ( shadowSize > 0 ) {
  shadow = true;
  gc.setTransform( translationX, translationY, shadowSize, magnification );
  gc.setAlpha( 20 );
  drawTrans( thumb );
 }
 // Draw the transformation onto the image
 //
 shadow = false;
 gc.setTransform( translationX, translationY, 0, magnification );
 gc.setAlpha( 255 );
 drawTrans( thumb );
 gc.dispose();
}

public void drawJob() {
 Point max = jobMeta.getMaximum();
 Point thumb = getThumb( area, max );
 offset = getOffset( thumb, area );
 gc.setBackground( EColor.BACKGROUND );
 if ( hori != null ) {
  hori.setThumb( thumb.x );
 }
 if ( vert != null ) {
  vert.setThumb( thumb.y );
 }
 // If there is a shadow, we draw the transformation first with an alpha
 // setting
 //
 if ( shadowSize > 0 ) {
  gc.setAlpha( 20 );
  gc.setTransform( translationX, translationY, shadowSize, magnification );
  shadow = true;
  drawJobElements();
 }
 // Draw the transformation onto the image
 //
 gc.setAlpha( 255 );
 gc.setTransform( translationX, translationY, 0, magnification );
 shadow = false;
 drawJobElements();
 gc.dispose();
}

public Image getTransformationImage( Device device, int x, int y, float magnificationFactor ) {
 GCInterface gc = new SWTGC( device, new Point( x, y ), iconsize );
 int gridSize =
  PropsUI.getInstance().isShowCanvasGridEnabled() ? PropsUI.getInstance().getCanvasGridSize() : 1;
 TransPainter transPainter =
  new TransPainter( gc, transMeta, new Point( x, y ), new SwtScrollBar( hori ), new SwtScrollBar( vert ),
   candidate, drop_candidate, selectionRegion, areaOwners, mouseOverSteps,
   PropsUI.getInstance().getIconSize(), PropsUI.getInstance().getLineWidth(), gridSize,
   PropsUI.getInstance().getShadowSize(), PropsUI.getInstance()
   .isAntiAliasingEnabled(), PropsUI.getInstance().getNoteFont().getName(), PropsUI.getInstance()
   .getNoteFont().getHeight(), trans, PropsUI.getInstance().isIndicateSlowTransStepsEnabled() );
 transPainter.setMagnification( magnificationFactor );
 transPainter.setStepLogMap( stepLogMap );
 transPainter.setStartHopStep( startHopStep );
 transPainter.setEndHopLocation( endHopLocation );
 transPainter.setNoInputStep( noInputStep );
 transPainter.setEndHopStep( endHopStep );
 transPainter.setCandidateHopType( candidateHopType );
 transPainter.setStartErrorHopStep( startErrorHopStep );
 transPainter.setShowTargetStreamsStep( showTargetStreamsStep );
 transPainter.buildTransformationImage();
 Image img = (Image) gc.getImage();
 gc.dispose();
 return img;
}