Let depth peeling renderer configure background color with view setting.

jzy3d-core/src/main/java/org/jzy3d/chart/Chart.java

@@ -104,19 +104,21 @@ public class Chart {
   /* HELPERS TO PRETTIFY CHARTS */
 
   public Chart black() {
-    getView().setBackgroundColor(Color.BLACK);
-    getAxisLayout().setGridColor(Color.WHITE);
-    getAxisLayout().setMainColor(Color.WHITE);
-    return this;
+    return color(Color.BLACK, Color.WHITE);
   }
-
+  
   public Chart white() {
-    getView().setBackgroundColor(Color.WHITE);
-    getAxisLayout().setGridColor(Color.BLACK);
-    getAxisLayout().setMainColor(Color.BLACK);
+    return color(Color.WHITE, Color.BLACK);
+  }
+
+  public Chart color(Color background, Color axis) {
+    getView().setBackgroundColor(background);
+    getAxisLayout().setGridColor(axis);
+    getAxisLayout().setMainColor(axis);
     return this;
   }
 
+  
   public Chart view2d() {
     IAxisLayout axe = getAxisLayout();
     axe.setZAxeLabelDisplayed(false);

jzy3d-core/src/main/java/org/jzy3d/plot3d/primitives/CoplanarityManager.java

@@ -20,14 +20,14 @@ import org.jzy3d.plot3d.transform.Transform;
  *
  */
 public class CoplanarityManager extends Drawable implements IGLBindedResource {
-  protected List<Drawable> outlines;
+  protected List<? extends Drawable> outlines;
   protected Drawable plane;
 
   public CoplanarityManager(Drawable outline, Drawable plane) {
     this(Lists.of(outline), plane);
   }
 
-  public CoplanarityManager(List<Drawable> outlines, Drawable plane) {
+  public CoplanarityManager(List<? extends Drawable> outlines, Drawable plane) {
     this.outlines = outlines;
     this.plane = plane;
 
@@ -45,7 +45,7 @@ public class CoplanarityManager extends Drawable implements IGLBindedResource {
    * @param outlines
    * @param plane
    */
-  protected void computeBounds(List<Drawable> outlines, Drawable plane) {
+  protected void computeBounds(List<? extends Drawable> outlines, Drawable plane) {
     this.bbox = new BoundingBox3d();
 
     if (plane.getBounds() != null && !plane.getBounds().isReset()) {

jzy3d-core/src/main/java/org/jzy3d/plot3d/rendering/view/View.java

@@ -12,6 +12,7 @@ import org.jzy3d.events.IViewPointChangedListener;
 import org.jzy3d.events.ViewIsVerticalEvent;
 import org.jzy3d.events.ViewLifecycleEvent;
 import org.jzy3d.events.ViewPointChangedEvent;
+import org.jzy3d.io.Console;
 import org.jzy3d.maths.BoundingBox3d;
 import org.jzy3d.maths.Coord2d;
 import org.jzy3d.maths.Coord3d;
@@ -926,6 +927,8 @@ public class View {
     painter.clearColor(backgroundColor);
     painter.glClearDepth(1);
 
+    //Console.println("View.clear with color", backgroundColor);
+    
     if (!slave) {
       painter.glClearColorAndDepthBuffers();
     }

jzy3d-depthpeeling/src/main/java/org/jzy3d/plot3d/rendering/ddp/DepthPeelingRenderer3d.java

@@ -75,7 +75,17 @@ public class DepthPeelingRenderer3d extends AWTRenderer3d {
     
     if(view!=null) {
       view.clear();
+      
+      float[] background = new float[3];
+      
+      background[0] = view.getBackgroundColor().r;
+      background[1] = view.getBackgroundColor().g;
+      background[2] = view.getBackgroundColor().b;
+      
+      dualPeelingAlgorithm.setBackground(background);
 
+      //dualPeelingAlgorithm.setOpacity(0.95f);
+      
       // Following line will call taskToRender, which will trigger :
       // algo.resetNumPass()
       // algo.doRender()

jzy3d-depthpeeling/src/main/java/org/jzy3d/plot3d/rendering/ddp/algorithms/AbstractDepthPeelingAlgorithm.java

@@ -33,6 +33,27 @@ public abstract class AbstractDepthPeelingAlgorithm implements IDepthPeelingAlgo
 
 
   public AbstractDepthPeelingAlgorithm() {}
+  
+  
+  public void setBackground(float[] color) {
+    if(color.length!=3) {
+      throw new IllegalArgumentException("Expect an array with three components");
+    }
+    g_backgroundColor = color;
+  }
+  
+  public float[] getBackground(){
+    return g_backgroundColor;
+  }
+  
+  public void setOpacity(float opacity){
+    g_opacity[0] = opacity;
+  }
+  
+  public float getOpacity(){
+    return g_opacity[0];
+  }
+
 
   protected abstract void buildShaders(GL2 gl);
 

jzy3d-depthpeeling/src/main/java/org/jzy3d/plot3d/rendering/ddp/algorithms/IDepthPeelingAlgorithm.java

@@ -21,4 +21,13 @@ public interface IDepthPeelingAlgorithm {
   public IGLRenderer getTasksToRender();
 
   public void setTasksToRender(IGLRenderer tasksToRender);
+  
+  public void setBackground(float[] color);
+  
+  public float[] getBackground();
+  
+  public void setOpacity(float opacity);
+  
+  public float getOpacity();
+
 }