FX2D not usable as offscreen buffer

[EGjoni]

In 3.2.1, when attempting to draw into an FX2D PGraphics context which is not the main context as shown in this code:

PGraphics secondBuff; 

void setup() {
  size(400, 300, FX2D); 
  secondBuff = createGraphics(400, 300, FX2D); 
}

void draw() {
 background(100); 
 this.getGraphics().endDraw();

 secondBuff.beginDraw();
 secondBuff.strokeWeight(10);
 secondBuff.stroke(255);
 secondBuff.point(mouseX, mouseY);
 secondBuff.endDraw();

 this.getGraphics().beginDraw();
 image(secondBuff, 0,0);
}

The following error is thrown:

java.lang.NullPointerException
    at processing.javafx.PGraphicsFX2D.fillFromCalc(PGraphicsFX2D.java:1951)
    at processing.core.PGraphics.fill(PGraphics.java:6669)
    at processing.core.PGraphics.defaultSettings(PGraphics.java:963)
    at processing.core.PGraphics.checkSettings(PGraphics.java:938)
    at processing.javafx.PGraphicsFX2D.beginDraw(PGraphicsFX2D.java:147)
    at sketch_160827a.draw(sketch_160827a.java:28)
    at processing.core.PApplet.handleDraw(PApplet.java:2412)
    at processing.javafx.PSurfaceFX$1.handle(PSurfaceFX.java:83)
    at processing.javafx.PSurfaceFX$1.handle(PSurfaceFX.java:1)
    at com.sun.scenario.animation.shared.TimelineClipCore.visitKeyFrame(TimelineClipCore.java:239)
    at com.sun.scenario.animation.shared.TimelineClipCore.playTo(TimelineClipCore.java:197)
    at javafx.animation.Timeline.impl_playTo(Timeline.java:176)
    at javafx.animation.AnimationAccessorImpl.playTo(AnimationAccessorImpl.java:39)
    at com.sun.scenario.animation.shared.InfiniteClipEnvelope.timePulse(InfiniteClipEnvelope.java:110)
    at javafx.animation.Animation.impl_timePulse(Animation.java:1102)
    at javafx.animation.Animation$1.lambda$timePulse$25(Animation.java:186)
    at java.security.AccessController.doPrivileged(Native Method)
    at javafx.animation.Animation$1.timePulse(Animation.java:185)
    at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344)
    at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:506)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
handleDraw() called before finishing
Could not run the sketch (Target VM failed to initialize).
For more information, read revisions.txt and Help ? Troubleshooting.

In contrast, if the offscreen PGraphics context is specified as JAVA2D, things work as expected:

PGraphics secondBuff; 

void setup() {
  size(400, 300, FX2D); 
  secondBuff = createGraphics(400, 300, JAVA2D); 
}

void draw() {
 background(100); 
 this.getGraphics().endDraw();

 secondBuff.beginDraw();
 secondBuff.strokeWeight(10);
 secondBuff.stroke(255);
 secondBuff.point(mouseX, mouseY);
 secondBuff.endDraw();

 this.getGraphics().beginDraw();
 image(secondBuff, 0,0);
}

Additionally (and I'm not sure if this should be filed as a separate issue), using an FX2D context as an offscreen buffer when the main context is anything other than FX2D results in a null pointer exception on the first line calling any of the FX2D context's draw functions. However, the IDE provides no stack trace when this happens.

`

[martin-y-lu]

This issue still seems to exist

[benfry]

Now fixed in the standalone JavaFX library for 4.0 beta 4: https://github.com/processing/processing4-javafx/commit/f7b8c29ccf32c42e645af4894a9999ad9252f117

JavaFX development is now taking place here: https://github.com/processing/processing4-javafx