Circle of jittering on Rotation

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  Someone at - it a technique it are willing to share?

  Thanks for your help

  • Create a large circle to determine the rotation
  • Create a small circle and place it at the top of the large circle
  • Create the letter T with the text tool and place it inside the small circle
  • Use the alignment tools to center the T in the small circle
  • Select the two layers (T and small circle) and then convert to smart object
  • Press alt-ctrl-t or opt-cmd-t to enter the mode of transformation for duplication
  • move the pivot point at the center of the large circle
  • Place the cursor just next to the small circle, then turn the circle at the location following (use the SHIFT key to constrain in 15 degree increments)
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  • Change the large circle to taste.

  

• Distribution of points on a circle

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  Oh my LORD, what a STUPID question! EVERYONE knows the answer to this except you! You should be ashamed of yourself.

  Now that we have the useless self-flagellation out of the way (all questions must be stupid), there are several ways, actually a lot. And here's one:

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• Circles AS3 animation

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• Circular button

  HY there, I found a volume button in JavaFx 2.0 at http://fxexperience.com/2012/01/fun-javafx-2-0-audio-player/

  I was wondering if there is an implementation that is already in the JFX 1.8

  You know, I mean a cursor as being "radial" or "circular".

  He would not even think of a circle where the button rotates around.

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  Thanks for the tips,

  So long

  Harry

  Hello

  I could easily port code to JavaFX 8.

  The classes that I post here and one of the download page to check what has changed, you can diff.

  Most of the changes is in the skin class and they host mainly so that the change in the skin and the API behavior between JavaFX 2.0 and 8.

  There is also a correction of syntax for the gradient in the CSS file.

  I have made no other changes to another class and I just put the provided NetBeans project to use the current platform of the JDK on my system (1.8.0_72) and the project could compile and run.

  I have not tested if it works fully well, but at least I can turn the knob with the mouse when you launch the application, then you should check if all sliders work properly.

  Now that said, keep in mind that: it will work not in JDK9 as the API packages and private classes will become inaccessible. the fact that behaviour what API will still not made public did not help either.

  Behavior class

  package fxexperienceplayer;
  
  import com.sun.javafx.scene.control.behavior.BehaviorBase;
  import com.sun.javafx.scene.control.behavior.KeyBinding;
  import java.util.ArrayList;
  import java.util.List;
  import javafx.scene.control.Slider;
  import static javafx.scene.input.KeyCode.*;
  import static javafx.scene.input.KeyEvent.KEY_RELEASED;
  import javafx.scene.input.MouseEvent;
  
  /**
  * A Behavior for slider that makes it into a circular knob
  *
  * @author Jasper Potts
  */
  public class KnobBehavior extends BehaviorBase {
      protected static final List SLIDER_BINDINGS = new ArrayList();
      static {
          SLIDER_BINDINGS.add(new KeyBinding(TAB, "TraverseNext"));
          SLIDER_BINDINGS.add(new KeyBinding(TAB, "TraversePrevious").shift());
          SLIDER_BINDINGS.add(new KeyBinding(UP, "IncrementValue"));
          SLIDER_BINDINGS.add(new KeyBinding(KP_UP, "IncrementValue"));
          SLIDER_BINDINGS.add(new KeyBinding(DOWN, "DecrementValue"));
          SLIDER_BINDINGS.add(new KeyBinding(KP_DOWN, "DecrementValue"));
          SLIDER_BINDINGS.add(new KeyBinding(LEFT, "TraverseLeft"));
          SLIDER_BINDINGS.add(new KeyBinding(KP_LEFT, "TraverseLeft"));
          SLIDER_BINDINGS.add(new KeyBinding(RIGHT, "TraverseRight"));
          SLIDER_BINDINGS.add(new KeyBinding(KP_RIGHT, "TraverseRight"));
          SLIDER_BINDINGS.add(new KeyBinding(HOME, KEY_RELEASED, "Home"));
          SLIDER_BINDINGS.add(new KeyBinding(END, KEY_RELEASED, "End"));
      }
      private double dragStartX,dragStartY;
  
      @Override protected void callAction(String name) {
          if ("Home".equals(name)) home();
          else if ("End".equals(name)) end();
          else if ("IncrementValue".equals(name)) incrementValue();
          else if ("DecrementValue".equals(name)) decrementValue();
          else super.callAction(name);
      }
  
      public KnobBehavior(Slider slider) {
          super(slider, SLIDER_BINDINGS);
      }
  
  //    @Override protected List createKeyBindings() {
  //        return SLIDER_BINDINGS;
  //    }
  
      /**
      * @param position The position of mouse in 0=min to 1=max range
      */
      public void knobRelease(MouseEvent e, double position) {
          final Slider slider = getControl();
          slider.setValueChanging(false);
          // detect click rather than drag
          if(Math.abs(e.getX()-dragStartX) < 3 && Math.abs(e.getY()-dragStartY) < 3) {
              slider.adjustValue((position+slider.getMin()) * (slider.getMax()-slider.getMin()));
          }
      }
  
      /**
      * @param position The position of mouse in 0=min to 1=max range
      */
      public void knobPressed(MouseEvent e, double position) {
          // If not already focused, request focus
          final Slider slider = getControl();
          if (!slider.isFocused())  slider.requestFocus();
          slider.setValueChanging(true);
          dragStartX = e.getX();
          dragStartY = e.getY();
      }
  
      /**
      * @param position The position of mouse in 0=min to 1=max range
      */
      public void knobDragged(MouseEvent e, double position) {
          final Slider slider = getControl();
          slider.adjustValue((position+slider.getMin()) * (slider.getMax()-slider.getMin()));
      }
  
      void home() {
          final Slider slider = getControl();
          slider.adjustValue(slider.getMin());
      }
  
      void decrementValue() {
          getControl().decrement();
      }
  
      void end() {
          final Slider slider = getControl();
          slider.adjustValue(slider.getMax());
      }
  
      void incrementValue() {
          getControl().increment();
      }
  }
  

  Skin class

  package fxexperienceplayer;
  
  import com.sun.javafx.scene.control.skin.BehaviorSkinBase;
  import java.util.Optional;
  import javafx.event.EventHandler;
  import javafx.scene.control.Slider;
  import javafx.scene.input.MouseEvent;
  import javafx.scene.layout.StackPane;
  
  /**
  * A simple knob skin for slider
  *
  * @author Jasper Potts
  */
  public class KnobSkin extends BehaviorSkinBase {
  
      private double knobRadius;
      private double minAngle = -140;
      private double maxAngle = 140;
      private double dragOffset;
  
      private StackPane knob;
      private StackPane knobOverlay;
      private StackPane knobDot;
  
      public KnobSkin(Slider slider) {
          super(slider, new KnobBehavior(slider));
          initialize();
          requestLayout();
          registerChangeListener(slider.minProperty(), "MIN");
          registerChangeListener(slider.maxProperty(), "MAX");
          registerChangeListener(slider.valueProperty(), "VALUE");
      }
  
      private void initialize() {
          knob = new StackPane() {
              @Override
              protected void layoutChildren() {
                  knobDot.autosize();
                  knobDot.setLayoutX((knob.getWidth() - knobDot.getWidth()) / 2);
                  knobDot.setLayoutY(5 + (knobDot.getHeight() / 2));
              }
  
          };
          knob.getStyleClass().setAll("knob");
          knobOverlay = new StackPane();
          knobOverlay.getStyleClass().setAll("knobOverlay");
          knobDot = new StackPane();
          knobDot.getStyleClass().setAll("knobDot");
  
          getChildren().setAll(knob, knobOverlay);
          knob.getChildren().add(knobDot);
  
          getSkinnable().setOnMousePressed(new EventHandler() {
              @Override
              public void handle(MouseEvent me) {
                  double dragStart = mouseToValue(me.getX(), me.getY());
                  double zeroOneValue = (getSkinnable().getValue() - getSkinnable().getMin()) / (getSkinnable().getMax() - getSkinnable().getMin());
                  dragOffset = zeroOneValue - dragStart;
                  getBehavior().knobPressed(me, dragStart);
              }
          });
          getSkinnable().setOnMouseReleased(new EventHandler() {
              @Override
              public void handle(MouseEvent me) {
                  getBehavior().knobRelease(me, mouseToValue(me.getX(), me.getY()));
              }
          });
          getSkinnable().setOnMouseDragged(new EventHandler() {
              @Override
              public void handle(MouseEvent me) {
                  getBehavior().knobDragged(me, mouseToValue(me.getX(), me.getY()) + dragOffset);
              }
          });
      }
  
      private double mouseToValue(double mouseX, double mouseY) {
          double cx = getSkinnable().getWidth() / 2;
          double cy = getSkinnable().getHeight() / 2;
          double mouseAngle = Math.toDegrees(Math.atan((mouseY - cy) / (mouseX - cx)));
          double topZeroAngle;
          if (mouseX < cx) {
              topZeroAngle = 90 - mouseAngle;
          } else {
              topZeroAngle = -(90 + mouseAngle);
          }
          double value = 1 - ((topZeroAngle - minAngle) / (maxAngle - minAngle));
          return value;
      }
  
      @Override
      protected void handleControlPropertyChanged(String p) {
          super.handleControlPropertyChanged(p);
          requestLayout();
      }
  
      void rotateKnob() {
          Slider s = getSkinnable();
          double zeroOneValue = (s.getValue() - s.getMin()) / (s.getMax() - s.getMin());
          double angle = minAngle + ((maxAngle - minAngle) * zeroOneValue);
          knob.setRotate(angle);
      }
  
      private void requestLayout() {
          final Optional slider = Optional.ofNullable((Slider) getNode());
          slider.ifPresent(s -> s.requestLayout());
      }
  
      @Override
      protected void layoutChildren(double contentX, double contentY, double contentWidth, double contentHeight) {
          super.layoutChildren(contentX, contentY, contentWidth, contentHeight);
          // calculate the available space
          double x = contentX;
          double y = contentY;
          double w = contentWidth;
          double h = contentHeight;
          double cx = x + (w / 2);
          double cy = y + (h / 2);
  
          // resize thumb to preferred size
          double knobWidth = knob.prefWidth(-1);
          double knobHeight = knob.prefHeight(-1);
          knobRadius = Math.max(knobWidth, knobHeight) / 2;
          knob.resize(knobWidth, knobHeight);
          knob.setLayoutX(cx - knobRadius);
          knob.setLayoutY(cy - knobRadius);
          knobOverlay.resize(knobWidth, knobHeight);
          knobOverlay.setLayoutX(cx - knobRadius);
          knobOverlay.setLayoutY(cy - knobRadius);
          rotateKnob();
      }
  
      @Override
      protected double computeMinWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
          return (leftInset + knob.minWidth(-1) + rightInset);
      }
  
      @Override
      protected double computeMinHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
          return (topInset + knob.minHeight(-1) + bottomInset);
      }
  
      @Override
      protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
          return (leftInset + knob.prefWidth(-1) + rightInset);
      }
  
      @Override
      protected double computePrefHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
          return (topInset + knob.prefHeight(-1) + bottomInset);
      }
  
      @Override
      protected double computeMaxWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
          return Double.MAX_VALUE;
      }
  
      @Override
      protected double computeMaxHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
          return Double.MAX_VALUE;
      }
  }
  

  CSS (fixed the linear gradient towards the end of the file):

  #volume .knobOverlay {
      -fx-background-color: linear-gradient(from 0% 0% to 0% 100%, rgba(255,255,255,0.1) 0%,  rgba(0,0,0,0.5) 100%);
      -fx-background-radius: 500;
      -fx-background-insets: 0;
      -fx-background-image: url("images/volume-highlights.png");
      -fx-background-position: center center;
  }
  

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  https://forums.Adobe.com/thread/1249756