polarizers... linear vs. circular

Just trying to sort out the differences... and decide what is best for me.

.. tips are another fire at the crossroads... you will still need to make the choice... its just easier to see how you might prefer.

A "circular" polarizer is simply a linear polarizer which has a blade quarter-wave on the back of it.  This means that only the light corresponding to the direction polarized lens can get through... but once it passes through you may think it is getting a slight "twist".  Without this fix quarter-wave, the polarizer would make it difficult for the two autofocus sensors as well as for the built-in light meter.

That is why virtually all devices with integrated metering and autofocus need a polarizer "circular".

You can use a polarizer 'linear' (sometimes called a polarizer 'top') on manual focus cameras that have not integrated as a film camera more old.

You can even create a polarizing variable by stacking a linear polarizer in front of a polarizer circular.

Tags: Canon Camera

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  • Circular button

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    Harry

    Hello

    I could easily port code to JavaFX 8.

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    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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    ******************************************
    --> * Adobe Certified Expert *.
    --> www.mudbubble.com
    --> www.keyframer.com

    Wolli World says:
    > Hi,.
    >
    > It must be something really simple, but I googled until I can't see
    > straight and still have not been able to find the answer. I'm not too
    > with the flash drawing tools, so I'm not familiar with them. All that I am
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    > everywhere and I can not figure out how to get the linear gradient to follow a
    > circular path. If you don't know exactly what I'm talking about, Adobe.com
    > use the same little rotating preloader circle on its home page. Can anyone
    > point me to a tutorial or just tell me how to do? I think it happened to
    > be something simple that I'm missing.
    >
    > Thank you!
    > Holli
    >

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    Hello

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    You can see keyframes in video animation in the timeline Control-V controls.

    But unfortunately there is no option to change the interpolation of keyframes. You must use your comments to make a feature request.

    You can also watch TrackX of CoreMelt, which is ideal for what you want to do.

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