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/*
* Copyright (c) 2012, 2015, Oracle and/or its affiliates.
* All rights reserved. Use is subject to license terms.
*
* This file is available and licensed under the following license:
*
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* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
* - Neither the name of Oracle Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package ensemble.control;
import javafx.animation.AnimationTimer;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Point2D;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.effect.DisplacementMap;
import javafx.scene.effect.FloatMap;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
public class BookBend {
private Color bendEndColor = Color.LIGHTBLUE.interpolate(Color.BLACK, 0.6);
private Color bendStartColor = Color.LIGHTBLUE.darker();
private Color pathColor = Color.LIGHTBLUE;
private int newWidth, newHeight;
private double oldTargetX, oldTargetY;
private double targetX = 250;
private double targetY = 250;
private Path clip;
private Path p;
private Path shadow;
private float[][] buffer = new float[1000][2];
private FloatMap map = new FloatMap();
private Node node;
private boolean updateNeeded = false;
private boolean isAnimationTimerActive = false;
private AnimationTimer animationTimer = new AnimationTimer() {
@Override
public void handle(long l) {
if(updateNeeded){
update();
}
}
};
private void startAnimationTimer(){
if(!isAnimationTimerActive){
this.animationTimer.start();
isAnimationTimerActive = true;
}
}
private void stopAnimationTimer(){
this.animationTimer.stop();
isAnimationTimerActive = false;
}
private void setUpdateNeeded(boolean value){
if(isAnimationTimerActive == false && value == true && node.getScene() != null){
startAnimationTimer();
}
this.updateNeeded = value;
}
public BookBend(final Node node, Path path) {
this(node, path, null, null);
}
public BookBend(final Node node, Path path, Path shadow) {
this(node, path, shadow, null);
}
/**
* Creates DisplacementMap effect for the bend
* @param node target node
* @param path path that is used to draw the opposite side of a bend
* Its fill is updated with linear gradient.
* @param shadow path that is used to draw the shadow of a bend
* Its fill is updated with linear gradient.
* @param clip path that is used to clip the content of the page either
* for mouse operations or for visuals
*/
public BookBend(final Node node, Path path, Path shadow, Path clip) {
this.node = node;
this.p = path;
this.shadow = shadow;
this.clip = clip;
node.setEffect(new DisplacementMap(map));
node.layoutBoundsProperty().addListener((Observable arg0) -> {
newWidth = (int) Math.round(node.getLayoutBounds().getWidth());
newHeight = (int) Math.round(node.getLayoutBounds().getHeight());
if (newWidth != map.getWidth() || newHeight != map.getHeight()) {
setUpdateNeeded(true);
}
});
node.sceneProperty().addListener((ObservableValue ov, Scene oldValue, Scene newValue) -> {
if(newValue == null){
stopAnimationTimer();
}
});
newWidth = (int) Math.round(node.getLayoutBounds().getWidth());
newHeight = (int) Math.round(node.getLayoutBounds().getHeight());
}
/**
* Sets colors for path gradient. Values are used on next update().
* @param pathColor Path Color
* @param bendStartColor Starting path color
* @param bendEndColor Ending path color
*/
public void setColors(Color pathColor, Color bendStartColor, Color bendEndColor) {
this.pathColor = pathColor;
this.bendEndColor = bendEndColor;
this.bendStartColor = bendStartColor;
Paint fill = p.getFill();
if (fill instanceof LinearGradient) {
LinearGradient lg = (LinearGradient) fill;
if (lg.getStops().size() >= 3) {
p.setFill(new LinearGradient(lg.getStartX(), lg.getStartY(), lg.getEndX(), lg.getEndY(), false, CycleMethod.NO_CYCLE,
new Stop(lg.getStops().get(0).getOffset(), pathColor),
new Stop(lg.getStops().get(1).getOffset(), bendStartColor),
new Stop(lg.getStops().get(2).getOffset(), bendEndColor)));
}
}
}
public double getTargetX() {
return targetX;
}
public double getTargetY() {
return targetY;
}
public Color getPathColor() {
return pathColor;
}
public Color getBendEndColor() {
return bendEndColor;
}
public Color getBendStartColor() {
return bendStartColor;
}
/**
* Updates DisplacementMap and path to target coordinates.
* @param targetX target X
* @param targetY target Y
*/
public void update(double targetX, double targetY) {
this.targetX = targetX;
this.targetY = targetY;
if (this.targetX != oldTargetX || this.targetY != oldTargetY) {
setUpdateNeeded(true);
}
}
/**
* Updates DisplacementMap and path for current coordinates.
*/
public void update() {
setUpdateNeeded(false);
if (newWidth == map.getWidth() && newHeight == map.getHeight()
&& targetX == oldTargetX && targetY == oldTargetY) {
return;
}
oldTargetX = targetX;
oldTargetY = targetY;
if (newWidth != map.getWidth() || newHeight != map.getHeight()) {
map.setWidth(newWidth);
map.setHeight(newHeight);
}
final double W = node.getLayoutBounds().getWidth();
final double H = node.getLayoutBounds().getHeight();
// target point F for folded corner
final double xF = Math.min(targetX, W - 1);
final double yF = Math.min(targetY, H - 1);
final Point2D F = new Point2D(xF, yF);
// corner point O
final double xO = W;
final double yO = H;
// distance between them
final double FO = Math.hypot(xF - xO, yF - yO);
final double AF = FO / 2;
final double AC = Math.min(AF * 0.5, 200);
// radius of the fold as seen along the l2 line
final double R = AC / Math.PI * 1.5;
final double BC = R;
final double flat_R = AC;
// Gradient for the line from target point to corner point
final double K = (yO - yF) / (xO - xF);
// angle of a line l1
final double ANGLE = Math.atan(1 / K);
// point A (on line l1 - the mirror line of target and corner points)
final double xA = (xO + xF) / 2;
final double yA = (yO + yF) / 2;
// end points of line l1
final double bottomX = xA - (H - yA) * K;
final double bottomY = H;
final double rightX = W;
final double rightY = yA - (W - xA) / K;
final Point2D RL1 = new Point2D(rightX, rightY);
final Point2D BL1 = new Point2D(bottomX, bottomY);
// point C (on line l2 - the line when distortion begins)
final double kC = AC / AF;
final double xC = xA - (xA - xF) * kC;
final double yC = yA - (yA - yF) * kC;
final Point2D C = new Point2D(xC, yC);
final Point2D RL2 = new Point2D(W, yC - (W - xC) / K);
final Point2D BL2 = new Point2D(xC - (H - yC) * K, H);
// point B (on line l3 - the line where distortion ends)
final double kB = BC / AC;
final double xB = xC + (xA - xC) * kB;
final double yB = yC + (yA - yC) * kB;
// Bottom ellipse calculations
final Point2D BP1 = calcIntersection(F, BL1, BL2, C);
final Point2D BP3 = BL2;
final Point2D BP2 = middle(BP1, BP3, 0.5);
final Point2D BP4 = new Point2D(xB + BP2.getX() - xC, yB + BP2.getY() - yC);
final double bE_x1 = hypot(BP2, BP3);
final double bE_y2 = -hypot(BP2, BP4);
final double bE_yc = -hypot(BP2, BL1);
final double bE_y0 = bE_y2 * bE_y2 / (2 * bE_y2 - bE_yc);
final double bE_b = bE_y0 - bE_y2;
final double bE_a = Math.sqrt(-bE_x1 * bE_x1 / bE_y0 * bE_b * bE_b / bE_yc);
// Right ellipse calculations
final Point2D RP1 = calcIntersection(F, RL1, RL2, C);
final Point2D RP3 = RL2;
final Point2D RP2 = middle(RP1, RP3, 0.5);
final Point2D RP4 = new Point2D(xB + RP2.getX() - xC, yB + RP2.getY() - yC);
final double rE_x1 = hypot(RP2, RP3);
final double rE_y2 = -hypot(RP2, RP4);
final double rE_yc = -hypot(RP2, RL1);
final double rE_y0 = rE_y2 * rE_y2 / (2 * rE_y2 - rE_yc);
final double rE_b = rE_y0 - rE_y2;
final double rE_a = Math.sqrt(-rE_x1 * rE_x1 / rE_y0 * rE_b * rE_b / rE_yc);
p.setFill(new LinearGradient(xF, yF, xO, yO, false, CycleMethod.NO_CYCLE,
new Stop(0, pathColor),
new Stop((xC - xF) / (xO - xF), bendStartColor),
new Stop((xB - xF) / (xO - xF), bendEndColor)));
ArcTo arcTo1 = new ArcTo();
arcTo1.setXAxisRotation(Math.toDegrees(-ANGLE));
arcTo1.setRadiusX(bE_a);
arcTo1.setRadiusY(bE_b);
arcTo1.setX(BP1.getX());
arcTo1.setY(BP1.getY());
ArcTo arcTo2 = new ArcTo();
arcTo2.setXAxisRotation(Math.toDegrees(-ANGLE));
arcTo2.setRadiusX(rE_a);
arcTo2.setRadiusY(rE_b);
arcTo2.setX(RP4.getX());
arcTo2.setY(RP4.getY());
p.getElements().setAll(
new MoveTo(BP4.getX(), BP4.getY()),
arcTo1,
new LineTo(xF, yF),
new LineTo(RP1.getX(), RP1.getY()),
arcTo2,
new ClosePath());
if (shadow != null) {
double level0 = (xB - xF) / (xO - xF) - R / FO * 0.5;
double level1 = (xB - xF) / (xO - xF) + (0.3 + (200 - AC) / 200) * R / FO;
shadow.setFill(new LinearGradient(xF, yF, xO, yO, false, CycleMethod.NO_CYCLE,
new Stop(level0, Color.rgb(0, 0, 0, 0.7)),
new Stop(level0 * 0.3 + level1 * 0.7, Color.rgb(0, 0, 0, 0.25)),
new Stop(level1, Color.rgb(0, 0, 0, 0.0)),
new Stop(1, Color.rgb(0, 0, 0, 0))));
ArcTo arcTo3 = new ArcTo();
arcTo3.setXAxisRotation(Math.toDegrees(-ANGLE));
arcTo3.setRadiusX(rE_a);
arcTo3.setRadiusY(rE_b);
arcTo3.setX(RP4.getX());
arcTo3.setY(RP4.getY());
arcTo3.setSweepFlag(true);
ArcTo arcTo4 = new ArcTo();
arcTo4.setXAxisRotation(Math.toDegrees(-ANGLE));
arcTo4.setRadiusX(bE_a);
arcTo4.setRadiusY(bE_b);
arcTo4.setX(BP3.getX());
arcTo4.setY(BP3.getY());
arcTo4.setSweepFlag(true);
shadow.getElements().setAll(
new MoveTo(RP3.getX(), RP3.getY()),
arcTo3,
new LineTo(BP4.getX(), BP4.getY()),
arcTo4,
new LineTo(xO, yO),
new ClosePath());
}
if (clip != null) {
final Point2D RL3 = new Point2D(W, yB - (W - xB) / K);
final Point2D BL3 = new Point2D(xB - (H - yB) * K, H);
clip.getElements().setAll(
new MoveTo(0, 0),
RL3.getY() > 0 ? new LineTo(W, 0) : new LineTo(0, 0),
RL3.getY() >= 0 ? new LineTo(RL3.getX(), RL3.getY()) : new LineTo(xB - (0 - yB) * K, 0),
BL3.getX() >= 0 ? new LineTo(BL3.getX(), BL3.getY()) : new LineTo(0, yB - (0 - xB) / K),
BL3.getX() > 0 ? new LineTo(0, H) : new LineTo(0, 0),
new ClosePath());
}
final double K2 = -K;
final double C2 = BP3.getX() - K2 * H;
final double K3 = -K;
final double C3 = xB - K3 * yB;
final double STEP = Math.max(0.1, R / (buffer.length - 1));
final double HYPOT = Math.hypot(1, K);
final double yR = 1.5 * R;
double x_1 = 0, y_1 = 0, cur_len = 0;
for (double len = 0; len <= R; len += STEP) {
final int index = (int) Math.round(len / STEP);
final double angle = Math.asin(len / R);
final double y = yR * Math.cos(angle);
if (len > 0) {
cur_len += Math.hypot(y - y_1, len - x_1);
}
buffer[index][0] = (float) angle;
buffer[index][1] = (float) (cur_len * flat_R);
x_1 = len;
y_1 = y;
}
double total_len = cur_len;
for (double len = 0; len <= R; len += STEP) {
final int index = (int) Math.round(len / STEP);
final double flat_len = buffer[index][1] / total_len;
final double delta_len = flat_len - len;
final double xs = delta_len / HYPOT;
final double ys = K * delta_len / HYPOT;
buffer[index][0] = (float) (xs / W);
buffer[index][1] = (float) (ys / H);
}
for (int y = 0; y < map.getHeight(); y++) {
final double lx2 = K2 * (y + 0.5) + C2;
final double lx3 = K3 * (y + 0.5) + C3;
for (int x = 0; x < map.getWidth(); x++) {
if (x + 0.5 < lx2) {
map.setSamples(x, y, 0, 0);
} else if (x + 0.5 >= lx3 - 1) {
map.setSamples(x, y, 1, 0);
} else {
final double len = Math.abs((x + 0.5) - K2 * (y + 0.5) - C2) / HYPOT;
final int index = (int) Math.round(len / STEP);
map.setSamples(x, y, buffer[index][0], buffer[index][1]);
}
}
}
}
private static Point2D calcIntersection(Point2D ap1, Point2D ap2, Point2D bp1, Point2D bp2) {
final double a1 = ap1.getY() - ap2.getY();
final double b1 = ap2.getX() - ap1.getX();
final double c1 = ap1.getX() * ap2.getY() - ap2.getX() * ap1.getY();
final double a2 = bp1.getY() - bp2.getY();
final double b2 = bp2.getX() - bp1.getX();
final double c2 = bp1.getX() * bp2.getY() - bp2.getX() * bp1.getY();
final double d = a1 * b2 - a2 * b1;
return new Point2D(
(b1 * c2 - b2 * c1) / d,
(c1 * a2 - c2 * a1) / d);
}
private static Point2D middle(Point2D a, Point2D a1, double value) {
return new Point2D(
a1.getX() * value + a.getX() * (1 - value),
a1.getY() * value + a.getY() * (1 - value));
}
private static double hypot(Point2D p1, Point2D p2) {
return Math.hypot(p1.getX() - p2.getX(), p1.getY() - p2.getY());
}
public void detach() {
node.setEffect(null);
}
}
