//
// Nenya library - tools for developing networked games
// Copyright (C) 2002-2012 Three Rings Design, Inc., All Rights Reserved
// https://github.com/threerings/nenya
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package com.threerings.media.animation;
import java.awt.AlphaComposite;
import java.awt.Composite;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import com.samskivert.swing.Label;
public class FloatingTextAnimation extends Animation
{
/**
* Constructs an animation for the given text centered at the given coordinates.
*/
public FloatingTextAnimation (Label label, int x, int y)
{
this(label, x, y, DEFAULT_FLOAT_PERIOD);
}
/**
* Constructs an animation for the given text centered at the given coordinates. The animation
* will float up the screen for 30 pixels.
*/
public FloatingTextAnimation (Label label, int x, int y, long floatPeriod)
{
this(label, x, y, x, y - DELTA_Y, floatPeriod);
}
/**
* Constructs an animation for the given text starting at the given coordinates and floating
* toward the specified coordinates.
*/
public FloatingTextAnimation (
Label label, int sx, int sy, int destx, int desty, long floatPeriod)
{
super(new Rectangle(sx, sy, label.getSize().width, label.getSize().height));
// save things off
_label = label;
_startX = _x = sx;
_startY = _y = sy;
_destx = destx;
_desty = desty;
_floatPeriod = floatPeriod;
// calculate our deltas
_dx = (destx - sx);
_dy = (desty - sy);
// initialize our starting alpha
_alpha = 1.0f;
}
/**
* Called to change the direction 180 degrees.
*/
public void flipDirection ()
{
_dx = -_dx;
_dy = -_dy;
}
/**
* Returns the label used to render this score animation.
*/
public Label getLabel ()
{
return _label;
}
@Override
public void setLocation (int x, int y)
{
super.setLocation(x, y);
// update our destination coordinates
_destx += (x - _startX);
_desty += (y - _startY);
// update our initial coordinates
_startX = _x = x;
_startY = _y = y;
// recalculate our deltas
_dx = (_destx - x);
_dy = (_desty - y);
}
/**
* Sets the duration of this score animation to the specified time in milliseconds. This
* should be called before the animation is added to the animation manager.
*/
public void setFloatPeriod (long floatPeriod)
{
_floatPeriod = floatPeriod;
}
@Override
public void tick (long timestamp)
{
boolean invalid = false;
if (_start == 0) {
// initialize our starting time
_start = timestamp;
// we need to make sure to invalidate ourselves initially
invalid = true;
}
long fadeDelay = _floatPeriod/2;
long fadePeriod = _floatPeriod - fadeDelay;
// figure out the current alpha
long msecs = timestamp - _start;
float oalpha = _alpha;
if (msecs > fadeDelay) {
long rmsecs = msecs - fadeDelay;
_alpha = Math.max(1.0f - (rmsecs / (float)fadePeriod), 0.0f);
_alpha = Math.min(_alpha, 1.0f);
}
// get the alpha composite
_comp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, _alpha);
// determine the new y-position of the score
float pctdone = (float)msecs / _floatPeriod;
int ox = _x, oy = _y;
_x = _startX + (int)(_dx * pctdone);
_y = _startY + (int)(_dy * pctdone);
// only update our location and dirty ourselves if we actually moved or our alpha changed
if (ox != _x || oy != _y) {
// dirty our old location
invalidate();
_bounds.setLocation(_x, _y);
invalid = true;
} else if (oalpha != _alpha) {
invalid = true;
}
if (invalid) {
// dirty our current location
invalidate();
}
// note whether we're done
_finished = (msecs >= _floatPeriod);
}
@Override
public void fastForward (long timeDelta)
{
if (_start > 0) {
_start += timeDelta;
}
}
@Override
public void paint (Graphics2D gfx)
{
Composite ocomp = gfx.getComposite();
if (_comp != null) {
gfx.setComposite(_comp);
}
paintLabels(gfx, _x, _y);
gfx.setComposite(ocomp);
}
/**
* Derived classes may wish to extend score animation and render more than just the standard
* single label.
*
* @param x the upper left coordinate of the animation.
* @param y the upper left coordinate of the animation.
*/
protected void paintLabels (Graphics2D gfx, int x, int y)
{
_label.render(gfx, x, y);
}
@Override
protected void toString (StringBuilder buf)
{
super.toString(buf);
buf.append(", x=").append(_x);
buf.append(", y=").append(_y);
buf.append(", alpha=").append(_alpha);
}
/** The starting animation time. */
protected long _start;
/** The label we're animating. */
protected Label _label;
/** The starting coordinates of the score. */
protected int _startX, _startY;
/** The current coordinates of the score. */
protected int _x, _y;
/** The destination coordinates towards which the animation travels. */
protected int _destx, _desty;
/** The distance to be traveled by the score animation. */
protected int _dx, _dy;
/** The duration for which we float up the screen. */
protected long _floatPeriod;
/** The current alpha level used to render the score. */
protected float _alpha;
/** The composite used to render the score. */
protected Composite _comp;
/** The time in milliseconds during which the score is visible. */
protected static final long DEFAULT_FLOAT_PERIOD = 1500L;
/** The total vertical distance the score travels. */
protected static final int DELTA_Y = 30;
}