/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.ui.animations;
import com.codename1.ui.Component;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Graphics;
import com.codename1.ui.Image;
import com.codename1.ui.Transform;
import com.codename1.ui.animations.Motion;
import com.codename1.ui.animations.Transition;
import com.codename1.util.MathUtil;
/**
* <p>A Transitions that flips between 2 components/forms using perspective transform where available.<br>
* Notice that this looks rather different on devices as perspective transform is available there but isn't
* on the simulator.
* </p>
* <script src="https://gist.github.com/codenameone/47602e679f61712693bd.js"></script>
* <img src="https://www.codenameone.com/img/developer-guide/transition-flip.jpg" alt="Flip" />
*
* @author Chen, Steve
*/
public class FlipTransition extends Transition {
private static final int STATE_MOVE_AWAY=1;
private static final int STATE_FLIP=2;
private static final int STATE_MOVE_CLOSER=3;
// Assume supported optimistically
// will be switched off in paint.
private boolean perspectiveSupported = true;
private Image sourceBuffer;
private Image destBuffer;
// 0 is front, 1.0 is back
private float flipState = 0f;
// 0 is at closest point (fills original bounds).
// 1 is at farthest point (all of flip will be visible).
private float zState = 0f;
private int transitionState = STATE_MOVE_AWAY;
private Motion motion;
private boolean firstFinished = false;
private boolean started = false;
private int bgColor = -1;
private float zNear;
private float zFar;
private int duration = 200;
private Transform tmpTransform;
private Transform perspectiveT;
private Transform currTransform;
/**
* Creates a Flip Transition
*/
public FlipTransition() {
}
/**
* Creates a Flip Transition
*
* @param bgColor the color to paint in the background when the transition
* paints, use -1 to not paint a background color
*/
public FlipTransition(int bgColor) {
this.bgColor = bgColor;
}
/**
* Creates a Flip Transition
*
* @param bgColor the color to paint in the background when the transition
* paints, use -1 to not paint a background color
* @param duration the duration of the transition
*/
public FlipTransition(int bgColor, int duration) {
this.bgColor = bgColor;
this.duration = duration;
}
@Override
public void initTransition() {
flipState = 0f;
transitionState = STATE_MOVE_AWAY;
zNear = 1600;
zFar = zNear+3000;
Component source = getSource();
Component destination = getDestination();
int w = source.getWidth();
int h = source.getHeight();
// a transition might occur with illegal source or destination values (common with
// improper replace() calls, this may still be valid and shouldn't fail
if (w <= 0 || h <= 0) {
return;
}
sourceBuffer = createMutableImage(source.getWidth(), source.getHeight());
paint(sourceBuffer.getGraphics(), source, -source.getAbsoluteX(), -source.getAbsoluteY());
destBuffer = createMutableImage(destination.getWidth(), destination.getHeight());
paint(destBuffer.getGraphics(), destination, -destination.getAbsoluteX(), -destination.getAbsoluteY());
if (source instanceof Form) {
setBgColor(0);
}
motion = Motion.createLinearMotion(0, 100, duration);
motion.start();
}
@Override
public boolean animate() {
int val = motion.getValue();
switch (transitionState){
case STATE_MOVE_AWAY: {
zState = ((float)val)/100f;
if ( motion.isFinished() || !perspectiveSupported){
transitionState = STATE_FLIP;
motion = Motion.createLinearMotion(0, 180, duration);
motion.start();
}
return true;
}
case STATE_FLIP: {
double valInRadians = Math.PI / 180f * (double) val;
double projectedPos = Math.cos(valInRadians);
flipState = (float) ((-projectedPos) / 2.0 + 0.5);
if (motion.isFinished()) {
transitionState = STATE_MOVE_CLOSER;
if ( perspectiveSupported ){
motion = Motion.createLinearMotion(100, 0, duration);
motion.start();
} else {
return false;
}
}
return true;
}
case STATE_MOVE_CLOSER: {
zState = ((float)val)/100f;
return !motion.isFinished();
}
default:
throw new RuntimeException("Invalid transition state");
}
}
private void makePerspectiveTransform(Transform t){
int x = getSource().getAbsoluteX();
int y = getSource().getAbsoluteY();
int w = getSource().getWidth();
int h = getSource().getHeight();
float displayH = Display.getInstance().getDisplayHeight();
float displayW = Display.getInstance().getDisplayWidth();
//double midX = (float)x+(float)w/2.0;
//double midY = (float)y+(float)h/2.0;
double fovy = 0.25;
t.setPerspective((float)fovy, (float)displayW/(float)displayH, zNear, zFar);
}
@Override
public void paint(Graphics g) {
// this can happen if a transition is cut short
if(destBuffer == null) {
return;
}
int cx = g.getClipX();
int cy = g.getClipY();
int cw = g.getClipWidth();
int ch = g.getClipHeight();
int x = getSource().getAbsoluteX();
int y = getSource().getAbsoluteY();
int w = getSource().getWidth();
int h = getSource().getHeight();
g.setClip(x, y, w, h);
if (getBgColor() >= 0) {
int c = g.getColor();
g.setColor(getBgColor());
g.fillRect(x, y, w, h);
g.setColor(c);
} else {
getSource().paintBackgrounds(g);
}
if ( g.isPerspectiveTransformSupported()){
float displayH = Display.getInstance().getDisplayHeight();
float displayW = Display.getInstance().getDisplayWidth();
double midX = (float)x+(float)w/2.0;
//double midY = (float)y+(float)h/2.0;
if (perspectiveT == null) {
perspectiveT = Transform.makeIdentity();
}
makePerspectiveTransform(perspectiveT);
float[] bottomRight = perspectiveT.transformPoint(new float[]{displayW, displayH, zNear});
if (currTransform == null) {
currTransform = Transform.makeTranslation(0,0, 0);
} else {
currTransform.setIdentity();
}
float xfactor = -displayW/bottomRight[0];
float yfactor = -displayH/bottomRight[1];
currTransform.scale(xfactor,yfactor,0f);
currTransform.translate((x+w/2)/xfactor, (y+h/2)/yfactor, 0);
currTransform.concatenate(perspectiveT);
float cameraZ = -zNear-w/2*zState;
float cameraX = -x-w/2;
float cameraY = -y-h/2;
currTransform.translate(cameraX, cameraY, cameraZ);
if ( transitionState == STATE_FLIP){
currTransform.translate((float)midX, y, 0);
}
Image img = null;
if ( flipState < 0.5 ){
img = sourceBuffer;
if ( transitionState == STATE_FLIP){
// We are showing the front image
// We will rotate it up to 90 degrees
// 0 -> 0 degrees
// 0.5 -> 90 degress
double sin = flipState * 2.0;
double angle = MathUtil.asin(sin);
currTransform.rotate((float)angle, 0, 1, 0);// rotate about y axis
}
} else {
img = destBuffer;
if ( transitionState == STATE_FLIP){
// We are showing the back image
// We are showing the back of the image
// We will rotate it from 90 degrees back to 0
// 0.5 -> 90 degrees
// 1.0 -> 0 degrees
double sin = (1.0-flipState)*2.0;
double angle = Math.PI-MathUtil.asin(sin);
currTransform.rotate((float)angle, 0, 1, 0);// rotate about y axis
}
}
if ( transitionState == STATE_FLIP ){
currTransform.translate(-(float)midX, -y, 0);
if ( flipState >= 0.5f ){
// The rotation will leave the destination image flipped
// backwards, so we need to transform it to be the
// mirror image
currTransform.scale(-1, 1, 1);
currTransform.translate(-2*x-w, 0, 0);
}
}
if (tmpTransform == null) {
tmpTransform = Transform.makeIdentity();
}
g.getTransform(tmpTransform);
g.setTransform(currTransform);
g.drawImage(img, x, y, w, h);
g.setTransform(tmpTransform);
} else {
perspectiveSupported = false;
if (flipState < 0.5) {
int frontX = x + (int) (flipState * (float) w);
int frontWidth = (int) ((float) w * (1.0 - flipState * 2.0));
g.drawImage(sourceBuffer, frontX, y, frontWidth, h);
} else {
double backState = 1.0 - flipState;
int backX = x + (int) (backState * (float) w);
int backWidth = (int) ((float) w * (1.0 - backState * 2.0));
g.drawImage(destBuffer, backX, y, backWidth, h);
}
}
g.setClip(cx, cy, cw, ch);
}
private Image createMutableImage(int w, int h) {
Display d = Display.getInstance();
return Image.createImage(Math.min(d.getDisplayWidth(), w), Math.min(d.getDisplayHeight(), h));
}
private void paint(Graphics g, Component cmp, int x, int y) {
paint(g, cmp, x, y, false);
}
private void paint(Graphics g, Component cmp, int x, int y, boolean background) {
int cx = g.getClipX();
int cy = g.getClipY();
int cw = g.getClipWidth();
int ch = g.getClipHeight();
g.translate(x, y);
cmp.paintComponent(g, background);
g.translate(-x, -y);
g.setClip(cx, cy, cw, ch);
}
public void cleanup() {
sourceBuffer = null;
destBuffer = null;
}
/**
* The duration for the flip transition
* @return the duration
*/
public int getDuration() {
return duration;
}
/**
* The duration for the flip transition
* @param duration the duration to set
*/
public void setDuration(int duration) {
this.duration = duration;
}
/**
* The background color that is painted behind the flipping effect or -1 to use the paintBackgrounds method instead
* @return the bgColor
*/
public int getBgColor() {
return bgColor;
}
/**
* The background color that is painted behind the flipping effect or -1 to use the paintBackgrounds method instead
* @param bgColor the bgColor to set
*/
public void setBgColor(int bgColor) {
this.bgColor = bgColor;
}
/**
* {@inheritDoc}
* @param reverse {@inheritDoc}
* @return {@inheritDoc}
*/
@Override
public Transition copy(boolean reverse) {
return new FlipTransition(bgColor, duration);
}
}