AfflictionNetworks/narya
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Added a tension parameter to control the sharpness of the curve.

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git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3825 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Andrzej Kapolka
2006-01-30 19:50:10 +00:00
parent eb2635770e
commit 63b4a49773
1 changed files with 9 additions and 7 deletions
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src/java/com/threerings/jme/camera/SplinePath.java
+9 -7
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@@ -39,9 +39,12 @@ public class SplinePath extends CameraPath
* @param tloc the target location * @param tloc the target location
* @param tdir the target direction * @param tdir the target direction
* @param duration the duration of the path * @param duration the duration of the path
* @param tension the tension parameter, which can range from zero to one:
* higher tension values create a more direct path with a sharper turn,
* lower values create a rounder path with a smoother turn
*/ */
public SplinePath (CameraHandler camhand, Vector3f tloc, public SplinePath (CameraHandler camhand, Vector3f tloc,
Vector3f tdir, float duration) Vector3f tdir, float duration, float tension)
{ {
super(camhand); super(camhand);
@@ -49,9 +52,9 @@ public class SplinePath extends CameraPath
Camera cam = camhand.getCamera(); Camera cam = camhand.getCamera();
_p0 = new Vector3f(cam.getLocation()); _p0 = new Vector3f(cam.getLocation());
_p1 = new Vector3f(tloc); _p1 = new Vector3f(tloc);
float pdist = _p0.distance(_p1); float tscale = (1f - tension) * _p0.distance(_p1);
_m0 = cam.getDirection().mult(pdist*0.5f); _m0 = cam.getDirection().mult(tscale);
_m1 = tdir.mult(pdist*0.5f); _m1 = tdir.mult(tscale);
_duration = duration; _duration = duration;
} }
@@ -70,12 +73,11 @@ public class SplinePath extends CameraPath
h11 = t3 - t2, h11 = t3 - t2,
h11p = 3*t2 - 2*t; h11p = 3*t2 - 2*t;
// take the derivative to find the direction and inst. speed // take the derivative to find the direction
_p0.mult(h00p, _dir); _p0.mult(h00p, _dir);
_dir.scaleAdd(h10p, _m0, _dir); _dir.scaleAdd(h10p, _m0, _dir);
_dir.scaleAdd(h01p, _p1, _dir); _dir.scaleAdd(h01p, _p1, _dir);
_dir.scaleAdd(h11p, _m1, _dir); _dir.scaleAdd(h11p, _m1, _dir);
float inst = _dir.length();
_dir.normalizeLocal(); _dir.normalizeLocal();
// evaluate the spline function to find the location // evaluate the spline function to find the location
@@ -104,6 +106,6 @@ public class SplinePath extends CameraPath
Vector3f _loc = new Vector3f(), _left = new Vector3f(), Vector3f _loc = new Vector3f(), _left = new Vector3f(),
_up = new Vector3f(), _dir = new Vector3f(); _up = new Vector3f(), _dir = new Vector3f();
/** The elapsed time and speed parameters. */ /** The elapsed time and total duration. */
float _elapsed, _duration; float _elapsed, _duration;
} }