Author: paperwing
Date: 2012-02-29 11:18:40 -0800 (Wed, 29 Feb 2012)
New Revision: 28399
Added:
csplugins/trunk/toronto/yuedong/paperwing-impl/src/main/java/org/cytoscape/paperwing/internal/geometric/ViewingVolume.java
Log:
refs #678 Added ViewingVolume class to be used for testing if an object to be
drawn lies inside the frustum before drawing it
Added:
csplugins/trunk/toronto/yuedong/paperwing-impl/src/main/java/org/cytoscape/paperwing/internal/geometric/ViewingVolume.java
===================================================================
---
csplugins/trunk/toronto/yuedong/paperwing-impl/src/main/java/org/cytoscape/paperwing/internal/geometric/ViewingVolume.java
(rev 0)
+++
csplugins/trunk/toronto/yuedong/paperwing-impl/src/main/java/org/cytoscape/paperwing/internal/geometric/ViewingVolume.java
2012-02-29 19:18:40 UTC (rev 28399)
@@ -0,0 +1,70 @@
+package org.cytoscape.paperwing.internal.geometric;
+
+/**
+ * This class represents the 6-sided viewing volume of the camera.
+ */
+public class ViewingVolume {
+
+ /**
+ * A class representing a plane, stored using its parameters A, B, C, D
in the equation Ax + By + Cz + D = 0.
+ */
+ private class Plane {
+ public double a, b, c, d = 0;
+ }
+
+ // The 6 planes that bound the viewing volume. The normals of the plane
face outward.
+ private Plane near, far;
+ private Plane top, bottom;
+ private Plane left, right;
+
+ /**
+ * Tests if a given point is inside the viewing volume.
+ *
+ * @param point
+ * @return <code>true</code> if the point is inside the volume,
<code>false</code> otherwise.
+ */
+ public boolean inside(Vector3 point) {
+ if (isInsidePlane(point, near) &&
+ isInsidePlane(point, far) &&
+ isInsidePlane(point, top) &&
+ isInsidePlane(point, bottom) &&
+ isInsidePlane(point, left) &&
+ isInsidePlane(point, right)) {
+
+ return true;
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Checks if a point is inside the given plane, that is, it lies on the
opposite side of the normal.
+ *
+ * @param point The test point
+ * @param plane The plane to test against
+ * @return <code>true</code> if the point lies on the opposite side of
the plane's normal, <code>false</code> otherwise.
+ */
+ private boolean isInsidePlane(Vector3 point, Plane plane) {
+ // Determine which side the point lies on using the distance
formula
+ // For information see
http://www.lighthouse3d.com/tutorials/maths/plane/
+
+ double signedDistance = point.x() * plane.a + point.y() *
plane.b + point.z() * plane.c + plane.d;
+
+ if (signedDistance > 0) {
+ return false;
+ } else {
+ return true;
+ }
+ }
+
+ /**
+ * Calculate the boundaries of the viewing volume given the camera
orientation, the distance to the near and far clipping planes,
+ * and the vertical and horizontal fields of view.
+ */
+ public void calculateViewingVolume(Vector3 cameraPosition, Vector3
cameraDirection, Vector3 cameraUp,
+ double zNear, double zFar, double verticalFieldOfView,
double horizontalFieldOfView) {
+
+
+ }
+
+}
Property changes on:
csplugins/trunk/toronto/yuedong/paperwing-impl/src/main/java/org/cytoscape/paperwing/internal/geometric/ViewingVolume.java
___________________________________________________________________
Added: svn:mime-type
+ text/plain
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