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Animation now accounts for X acceleration.

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git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3325 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Ted V
2005-02-01 20:42:21 +00:00
parent 6206d9f71b
commit 66321690e6
1 changed files with 26 additions and 14 deletions
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src/java/com/threerings/media/animation/SparkAnimation.java
+26 -14
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@@ -66,6 +66,7 @@ public class SparkAnimation extends Animation
// save things off
_ox = x;
_oy = y;
_xacc = xacc;
_yacc = yacc;
_images = images;
_delay = delay;
@@ -80,27 +81,37 @@ public class SparkAnimation extends Animation
for (int ii = 0; ii < _icount; ii++) {
// initialize spark position
int ajog = (jog == 0) ? 0 : RandomUtil.getInt(jog);
_xpos[ii] = x + ajog * getDirectionMult();
_ypos[ii] = y + ajog * getDirectionMult();
_xpos[ii] = x + ajog * randomDirection();
_ypos[ii] = y + ajog * randomDirection();
// choose a random x-axis velocity between the minimum and
// maximum passed in, and moving left or right at random
_sxvel[ii] = Math.max(RandomUtil.getFloat(xvel), minxvel) *
getDirectionMult();
// Choose random X and Y axis velocities between the inputted
// bounds
_sxvel[ii] = minxvel + RandomUtil.getFloat(1) * (xvel - minxvel);
_syvel[ii] = minyvel + RandomUtil.getFloat(1) * (yvel - minyvel);
// choose a random y-axis velocity between the minimum and
// maximum passed in. if there is any gravitational
// acceleration, make the y-axis velocity negative; else,
// choose to move up or down at random.
_syvel[ii] = (Math.max(RandomUtil.getFloat(yvel), minyvel)) *
((_yacc != 0) ? -1.0f : getDirectionMult());
// If accelerationes were given, make the starting velocities
// move against that acceleration; otherwise pick directions
// at random
if (_xacc > 0) {
_sxvel[ii] = -_sxvel[ii];
} else if (_xacc == 0) {
_sxvel[ii] *= randomDirection();
}
if (_yacc > 0) {
_syvel[ii] = -_syvel[ii];
} else if (_yacc == 0) {
_syvel[ii] *= randomDirection();
}
}
_alpha = 1.0f;
_comp = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, _alpha);
}
protected int getDirectionMult ()
/**
* Returns at random -1 for negative direction or +1 for positive.
*/
protected int randomDirection ()
{
return (RandomUtil.getInt(2) == 0) ? -1 : 1;
}
@@ -134,7 +145,8 @@ public class SparkAnimation extends Animation
// move all sparks and check whether any remain to be animated
for (int ii = 0; ii < _icount; ii++) {
// determine the travel distance
int xtrav = (int)(_sxvel[ii] * msecs);
int xtrav = (int)
((_sxvel[ii] * msecs) + (0.5f * _xacc * (msecs * msecs)));
int ytrav = (int)
((_syvel[ii] * msecs) + (0.5f * _yacc * (msecs * msecs)));