Brandon Kohn wrote:
> If I want to get the current visad coords and screen coords (by coords I
> mean the values for the 4 corners) for the box (the box that defines the
> graph region), what is the most proper way to go about this?
>
> I'd like to get these values in order to do some range testing when
> performing various operations such as zooming. I'd like to test whether a
> particular coordinate is inside the box.
You can do this with the getScreenCoords() method of
MouseBehavior (get it from the DisplayRenderer). You pass
it a double[2] or double[3] array depending on Java2D or
Java3D, and get back an int[2] array of screen coordinates.
The implementation for Java3D was incomplete (needs a method
in Java3D version 1.2 which has to be accessed by reflection),
so use the attached version of MouseBehaviorJ3D.java.
Good luck,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
//
// MouseBehaviorJ3D.java
//
/*
VisAD system for interactive analysis and visualization of numerical
data. Copyright (C) 1996 - 2002 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library 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 visad.java3d;
import visad.*;
import java.lang.reflect.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.rmi.*;
import java.awt.*;
import java.util.*;
/**
MouseBehaviorJ3D is the VisAD class for mouse behaviors for Java3D
*/
/*
On MOUSE_PRESSED event with left button,
((InputEvent) events[i]).getModifiers() returns 0 and
should return 16 ( = InputEvent.BUTTON1_MASK ).
((InputEvent) events[i]).getModifiers() correctly
returns 16 on MOUSE_RELEASED with left button.
*/
public class MouseBehaviorJ3D extends Behavior
implements MouseBehavior {
/** wakeup condition for MouseBehaviorJ3D */
private WakeupOr wakeup;
/** DisplayRenderer for Display */
DisplayRendererJ3D display_renderer;
DisplayImpl display;
MouseHelper helper = null;
/**
* Default Constructor
*/
public MouseBehaviorJ3D() {
}
/**
* Construct a MouseBehavior for the DisplayRenderer specified
* @param r DisplayRenderer to use
*/
public MouseBehaviorJ3D(DisplayRendererJ3D r) {
this(r, MouseHelper.class);
}
/**
* Construct a MouseBehavior for the DisplayRenderer specified
* @param r DisplayRenderer to use
* @param mhClass MouseHelper subclass to use
*/
public MouseBehaviorJ3D(DisplayRendererJ3D r, Class mhClass) {
try {
Class[] param = new Class[] {DisplayRenderer.class, MouseBehavior.class};
Constructor mhConstructor
mhClass.getConstructor(param);
helper = (MouseHelper) mhConstructor.newInstance(new Object[] {r, this});
}
catch (Exception e) {
throw new VisADError("cannot construct " + mhClass);
}
// helper = new MouseHelper(r, this);
display_renderer = r;
display = display_renderer.getDisplay();
WakeupCriterion[] conditions = new WakeupCriterion[5];
conditions[0] = new WakeupOnAWTEvent(MouseEvent.MOUSE_DRAGGED);
conditions[1] = new WakeupOnAWTEvent(MouseEvent.MOUSE_ENTERED);
conditions[2] = new WakeupOnAWTEvent(MouseEvent.MOUSE_EXITED);
conditions[3] = new WakeupOnAWTEvent(MouseEvent.MOUSE_PRESSED);
conditions[4] = new WakeupOnAWTEvent(MouseEvent.MOUSE_RELEASED);
wakeup = new WakeupOr(conditions);
}
// WLH 17 Dec 2001
public void destroy() {
helper = null;
display = null;
display_renderer = null;
}
/**
* Get the helper class used by this MouseBehavior.
* The <CODE>MouseHelper</CODE> defines the actions taken based
* on <CODE>MouseEvent</CODE>s.
* @return <CODE>MouseHelper</CODE> being used.
*/
public MouseHelper getMouseHelper() {
return helper;
}
/**
* Initialize this behavior. NOTE: Applications should not call
* this method. It is called by the Java 3D behavior scheduler.
*/
public void initialize() {
setWakeup();
}
/**
* Process a stimulus meant for this behavior. This method is
* invoked when a key is pressed. NOTE: Applications should not
* call this method. It is called by the Java 3D behavior scheduler.
* @param criteria an enumeration of triggered wakeup criteria
*/
public void processStimulus(Enumeration criteria) {
while (criteria.hasMoreElements()) {
WakeupCriterion wakeup = (WakeupCriterion) criteria.nextElement();
if (!(wakeup instanceof WakeupOnAWTEvent)) {
System.out.println("MouseBehaviorJ3D.processStimulus: non-" +
"WakeupOnAWTEvent");
}
else {
AWTEvent[] events = ((WakeupOnAWTEvent) wakeup).getAWTEvent();
for (int i=0; i<events.length; i++) {
helper.processEvent(events[i]);
}
}
}
setWakeup();
}
/**
* Return the VisAD ray corresponding to the component coordinates.
* @param screen_x x coordinate of the component
* @param screen_y y coordinate of the component
* @return corresponding VisADRay
* @see visad.VisADRay
* @see visad.LocalDisplay#getComponent()
*/
public VisADRay findRay(int screen_x, int screen_y) {
// System.out.println("findRay " + screen_x + " " + screen_y);
View view = display_renderer.getView();
Canvas3D canvas = display_renderer.getCanvas();
Point3d position = new Point3d();
canvas.getPixelLocationInImagePlate(screen_x, screen_y, position);
Point3d eye_position = new Point3d();
canvas.getCenterEyeInImagePlate(eye_position);
Transform3D t = new Transform3D();
canvas.getImagePlateToVworld(t);
t.transform(position);
t.transform(eye_position);
if (display.getGraphicsModeControl().getProjectionPolicy() =
View.PARALLEL_PROJECTION) {
eye_position = new Point3d(position.x, position.y,
position.z + 1.0f);
}
TransformGroup trans = display_renderer.getTrans();
Transform3D tt = new Transform3D();
trans.getTransform(tt);
tt.invert();
tt.transform(position);
tt.transform(eye_position);
// new eye_position = 2 * position - old eye_position
Vector3d vector = new Vector3d(position.x - eye_position.x,
position.y - eye_position.y,
position.z - eye_position.z);
vector.normalize();
VisADRay ray = new VisADRay();
ray.position[0] = position.x;
ray.position[1] = position.y;
ray.position[2] = position.z;
ray.vector[0] = vector.x;
ray.vector[1] = vector.y;
ray.vector[2] = vector.z;
// PickRay ray = new PickRay(position, vector);
return ray;
}
/**
* Return the VisAD ray corresponding to the VisAD cursor coordinates.
* @param cursor array (x,y,z) of cursor location
* @return corresponding VisADRay
* @see visad.VisADRay
* @see visad.DisplayRenderer#getCursor()
*/
public VisADRay cursorRay(double[] cursor) {
View view = display_renderer.getView();
Canvas3D canvas = display_renderer.getCanvas();
// note position already in Vworld coordinates
Point3d position = new Point3d(cursor[0], cursor[1], cursor[2]);
Point3d eye_position = new Point3d();
canvas.getCenterEyeInImagePlate(eye_position);
Transform3D t = new Transform3D();
canvas.getImagePlateToVworld(t);
t.transform(eye_position);
TransformGroup trans = display_renderer.getTrans();
Transform3D tt = new Transform3D();
trans.getTransform(tt);
tt.transform(position);
if (display.getGraphicsModeControl().getProjectionPolicy() =
View.PARALLEL_PROJECTION) {
eye_position = new Point3d(position.x, position.y,
position.z + 1.0f);
}
tt.invert();
tt.transform(position);
tt.transform(eye_position);
// new eye_position = 2 * position - old eye_position
Vector3d vector = new Vector3d(position.x - eye_position.x,
position.y - eye_position.y,
position.z - eye_position.z);
vector.normalize();
VisADRay ray = new VisADRay();
ray.position[0] = eye_position.x;
ray.position[1] = eye_position.y;
ray.position[2] = eye_position.z;
ray.vector[0] = vector.x;
ray.vector[1] = vector.y;
ray.vector[2] = vector.z;
// PickRay ray = new PickRay(eye_position, vector);
return ray;
}
private Method getPixelLocationFromImagePlateMethod = null;
/**
* Return the screen coordinates corresponding to the VisAD coordinates.
* @param position array of VisAD coordinates
* @return corresponding (x, y) screen coordinates
*/
public int[] getScreenCoords(double[] position) {
if (getPixelLocationFromImagePlateMethod == null) {
try {
Class canvas3DClass = Class.forName("javax.media.j3d.Canvas3D");
Class[] param
{javax.vecmath.Point3d.class, javax.vecmath.Point2d.class};
getPixelLocationFromImagePlateMethod
canvas3DClass.getMethod("getPixelLocationFromImagePlate", param);
if (getPixelLocationFromImagePlateMethod == null) return null;
}
catch (Exception e) {
return null;
}
}
// get transforms
Canvas3D canvas = display_renderer.getCanvas();
Transform3D t = new Transform3D();
canvas.getImagePlateToVworld(t);
TransformGroup trans = display_renderer.getTrans();
Transform3D tt = new Transform3D();
trans.getTransform(tt);
// compute image plate location
Point3d pos = new Point3d(position);
tt.transform(pos);
t.invert();
t.transform(pos);
// get screen coordinates
Point2d coords = new Point2d();
// CTR: unfortunately, the following method is Java3D 1.2 only
// canvas.getPixelLocationFromImagePlate(pos, coords);
// return new int[] {(int) coords.x, (int) coords.y};
try {
getPixelLocationFromImagePlateMethod.invoke(canvas,
new Object[] {pos, coords});
}
catch (Exception e) {
return null;
}
return new int[] {(int) coords.x, (int) coords.y};
}
/**
* Wakeup when necessary
*/
void setWakeup() {
wakeupOn(wakeup);
}
/**
* Create a translation matrix.
* @param transx x translation amount
* @param transy y translation amount
* @param transz z translation amount
* @return new translation matrix. This can be used to translate
* the current matrix
* @see #multiply_matrix(double[] a, double[] b)
*/
public double[] make_translate(double transx, double transy, double transz) {
return make_matrix(0.0, 0.0, 0.0, 1.0, transx, transy, transz);
}
/**
* Create a translation matrix. no translation in Z direction (useful
* for 2D in Java 3D.
* @param transx x translation amount
* @param transy y translation amount
* @return new translation matrix. This can be used to translate
* the current matrix
* @see #multiply_matrix(double[] a, double[] b)
*/
public double[] make_translate(double transx, double transy) {
return make_translate(transx, transy, 0.0);
}
/**
* Multiply the two matrices together.
* @param a first matrix
* @param b second matrix
* @return new resulting matrix
* @see #static_multiply_matrix
*/
public double[] multiply_matrix(double[] a, double[] b) {
return static_multiply_matrix(a, b);
}
/**
* Multiply the two matrices together. Static version of multiply_matrix.
* @param a first matrix
* @param b second matrix
* @return new resulting matrix
* @see #multiply_matrix(double[] a, double[] b)
*/
public static double[] static_multiply_matrix(double[] a, double[] b) {
Transform3D ta = new Transform3D(a);
Transform3D tb = new Transform3D(b);
ta.mul(tb);
double[] c = new double[16];
ta.get(c);
return c;
}
/**
* Make a transformation matrix to perform the given rotation, scale and
* translation. This function uses the fast matrix post-concatenation
* techniques from Graphics Gems.
* @param rotx x rotation
* @param roty y rotation
* @param rotz z rotation
* @param scale scaling factor
* @param transx x translation
* @param transy y translation
* @param transz z translation
* @return new matrix
*/
public double[] make_matrix(double rotx, double roty, double rotz,
double scale, double transx, double transy, double transz) {
return static_make_matrix(rotx, roty, rotz, scale, transx, transy, transz);
}
/**
* Make a transformation matrix to perform the given rotation, scale and
* translation. This function uses the fast matrix post-concatenation
* techniques from Graphics Gems. Static version of make_matrix.
* @see #make_matrix(double rotx, double roty, double rotz,
* double scale, double transx, double transy, double transz)
* @param rotx x rotation
* @param roty y rotation
* @param rotz z rotation
* @param scale scaling factor
* @param transx x translation
* @param transy y translation
* @param transz z translation
* @return new matrix
*/
public static double[] static_make_matrix(
double rotx, double roty, double rotz,
double scale, double transx, double transy, double transz) {
double sx, sy, sz, cx, cy, cz, t;
int i, j, k;
double deg2rad = 1.0 / 57.2957;
double[] matrix = new double[16];
double[][] mat = new double[4][4];
/* Get sin and cosine values */
sx = Math.sin(rotx * deg2rad);
cx = Math.cos(rotx * deg2rad);
sy = Math.sin(roty * deg2rad);
cy = Math.cos(roty * deg2rad);
sz = Math.sin(rotz * deg2rad);
cz = Math.cos(rotz * deg2rad);
/* Start with identity matrix */
mat[0][0] = 1.0; mat[0][1] = 0.0; mat[0][2] = 0.0; mat[0][3] = 0.0;
mat[1][0] = 0.0; mat[1][1] = 1.0; mat[1][2] = 0.0; mat[1][3] = 0.0;
mat[2][0] = 0.0; mat[2][1] = 0.0; mat[2][2] = 1.0; mat[2][3] = 0.0;
mat[3][0] = 0.0; mat[3][1] = 0.0; mat[3][2] = 0.0; mat[3][3] = 1.0;
/* Z Rotation */
for (i=0;i<4;i++) {
t = mat[i][0];
mat[i][0] = t*cz - mat[i][1]*sz;
mat[i][1] = t*sz + mat[i][1]*cz;
}
/* X rotation */
for (i=0;i<4;i++) {
t = mat[i][1];
mat[i][1] = t*cx - mat[i][2]*sx;
mat[i][2] = t*sx + mat[i][2]*cx;
}
/* Y Rotation */
for (i=0;i<4;i++) {
t = mat[i][0];
mat[i][0] = mat[i][2]*sy + t*cy;
mat[i][2] = mat[i][2]*cy - t*sy;
}
/* Scale */
for (i=0;i<3;i++) {
mat[i][0] *= scale;
mat[i][1] *= scale;
mat[i][2] *= scale;
}
/* Translation */
/* should be mat[0][3], mat[1][3], mat[2][3]
WLH 22 Dec 97 */
mat[0][3] = transx;
mat[1][3] = transy;
mat[2][3] = transz;
/*
mat[3][0] = transx;
mat[3][1] = transy;
mat[3][2] = transz;
*/
k = 0;
for (i=0; i<4; i++) {
for (j=0; j<4; j++) {
matrix[k] = mat[i][j];
k++;
}
}
return matrix;
}
static final double EPS = 0.000001;
/**
* Get the rotation, scale and translation parameters for the specified
* matrix. Results are not valid for non-uniform aspect (scale).
* @param rot array to hold x,y,z rotation values
* @param scale array to hold scale value
* @param trans array to hold x,y,z translation values
*/
public void instance_unmake_matrix(double[] rot, double[] scale,
double[] trans, double[] matrix) {
unmake_matrix(rot, scale, trans, matrix);
}
/**
* Get the rotation, scale and translation parameters for the specified
* matrix. Results are not valid for non-uniform aspect (scale).
* Static version of <CODE>instance_unmake_matrix</CODE>.
* @param rot array to hold x,y,z rotation values
* @param scale array to hold scale value
* @param trans array to hold x,y,z translation values
*/
public static void unmake_matrix(double[] rot, double[] scale,
double[] trans, double[] matrix) {
double sx, sy, sz, cx, cy, cz;
int i, j;
double[][] mat = new double[4][4];
double[][] nat = new double[4][4];
double scalex, scaley, scalez, scaleinv, cxa, cxb, cxinv;
if (rot == null || rot.length != 3) return;
if (scale == null || scale.length != 1) return;
if (trans == null || trans.length != 3) return;
if (matrix == null || matrix.length != 16) return;
int k = 0;
for (i=0; i<4; i++) {
for (j=0; j<4; j++) {
mat[i][j] = matrix[k];
k++;
}
}
/* translation */
/* WLH 24 March 2000, for consistency with change
of 22 Dec 97 in static_make_matrix
trans[0] = mat[3][0];
trans[1] = mat[3][1];
trans[2] = mat[3][2];
*/
trans[0] = mat[0][3];
trans[1] = mat[1][3];
trans[2] = mat[2][3];
/* scale */
scalex = scaley = scalez = 0.0;
for (i=0; i<3; i++) {
scalex += mat[0][i] * mat[0][i];
scaley += mat[1][i] * mat[1][i];
scalez += mat[2][i] * mat[2][i];
}
if (Math.abs(scalex - scaley) > EPS || Math.abs(scalex - scalez) > EPS) {
// System.out.println("problem " + scalex + " " + scaley + " " + scalez);
}
scale[0] = Math.sqrt((scalex + scaley + scalez)/3.0);
scaleinv = Math.abs(scale[0]) > EPS ? 1.0 / scale[0] : 1.0 / EPS;
for (i=0; i<3; i++) {
for (j=0; j<3; j++) {
nat[j][i] = scaleinv * mat[j][i];
}
}
/* rotation */
sx = -nat[2][1];
cxa = Math.sqrt(nat[2][0]*nat[2][0] + nat[2][2]*nat[2][2]);
cxb = Math.sqrt(nat[0][1]*nat[0][1] + nat[1][1]*nat[1][1]);
if (Math.abs(cxa - cxb) > EPS) {
// System.out.println("problem2 " + cxa + " " + cxb);
}
/* the sign of cx does not matter;
it is an ambiguity in 3-D rotations:
(rotz, rotx, roty) = (180+rotz, 180-rotx, 180+roty) */
cx = (cxa + cxb) / 2.0;
if (Math.abs(cx) > EPS) {
cxinv = 1.0 / cx;
sy = nat[2][0] * cxinv;
cy = nat[2][2] * cxinv;
sz = nat[0][1] * cxinv;
cz = nat[1][1] * cxinv;
}
else {
/* if cx == 0 then roty and rotz are ambiguous:
assume rotx = 0.0 */
sy = 0.0;
cy = 1.0;
sz = nat[0][2];
cz = nat[1][2];
}
rot[0] = 57.2957 * Math.atan2(sx, cx);
rot[1] = 57.2957 * Math.atan2(sy, cy);
rot[2] = 57.2957 * Math.atan2(sz, cz);
return;
}
/*
homogeneous coordinates:
point (x, y, z) is represented as (w*x, w*y, w*z, w) for w != 0
point (x, y, z, 1) transforms to
x' = x*mat[0] + y*mat[1] + z*mat[2] + mat[3]
y' = x*mat[4] + y*mat[5] + z*mat[6] + mat[7]
z' = x*mat[8] + y*mat[9] + z*mat[10] + mat[11]
w' = x*mat[12] + y*mat[13] + z*mat[14] + mat[15]
*/
/*
see ViewPlatform.TransformGroup in UniverseBuilderJ3D constructor
View.setProjectionPolicy
default is View.PERSPECTIVE_PROJECTION (vs PARALLEL_PROJECTION)
View.getVpcToEc(Transform3D vpcToEc)
"Compatibility mode method that retrieves the current ViewPlatform
Coordinates (VPC) system to Eye Coordinates (EC) transform and copies
it into the specified object."
View.getLeftProjection(Transform3D projection)
View.getRightProjection(Transform3D projection)
default is View.CYCLOPEAN_EYE_VIEW
require:
View.setCompatibilityModeEnable(true)
default is disabled
View.getLeftProjection(Transform3D projection)
"Compatibility mode method that specifies a viewing frustum for the
left eye that transforms points in Eye Coordinates (EC) to Clipping
Coordinates (CC)."
NOTE have View in UniverseBuilderJ3D
Canvas3D.getImagePlateToVworld(Transform3D t)
Canvas3D.getPixelLocationInImagePlate(int x, int y, Point3d position)
Canvas3D.getVworldToImagePlate(Transform3D t)
Canvas3D.getCenterEyeInImagePlate(Point3d position)
spec page 176: "final transform for rendering shapes to Canvas3D is
P * E * inv(ViewPlatform.TransformGroup) * trans
use Transform3D.invert for inv
where P = projection matrix from eye coords to clipping coords
i.e., projection
and E = matrix from ViewPlatform to eye coords
i.e., vpcToEc
*/
/*
is the mouse a Sensor or InputDevice?
if so, see spec page 369 for sensor to World transform
*/
/*
import javax.vecmath.*;
import javax.media.j3d.*;
public class TestTransform3D extends Object {
public static void main(String args[]) {
Transform3D trans_frustum = new Transform3D();
Transform3D trans_perspective = new Transform3D();
Transform3D trans_ortho = new Transform3D();
Transform3D trans_ortho2 = new Transform3D();
System.out.println("initial trans_frustum =\n" + trans_frustum);
trans_frustum.frustum(-1.0, 1.0, -1.0, 1.0, 1.0, 2.0);
System.out.println("trans_frustum =\n" + trans_frustum);
trans_perspective.perspective(0.5, 1.0, 1.0, 2.0);
System.out.println("trans_perspective =\n" + trans_perspective);
trans_ortho.ortho(-1.0, 1.0, -1.0, 1.0, 1.0, 2.0);
System.out.println("trans_ortho =\n" + trans_ortho);
trans_ortho2.ortho(-1.0, 1.0, -1.0, 1.0, 1.0, 3.0);
System.out.println("trans_ortho2 =\n" + trans_ortho2);
Transform3D trans_translate_scale
new Transform3D(new Matrix3d(1.0, 1.1, 1.2,
1.3, 1.4, 1.5,
1.6, 1.7, 1.8),
new Vector3d(2.1, 2.2, 2.3), 3.0);
System.out.println("trans_translate_scale =\n" + trans_translate_scale);
double[] matrix = {1.0, 1.1, 1.2, 1.3,
1.4, 1.5, 1.6, 1.7,
1.8, 1.9, 2.0, 2.1,
2.2, 2.3, 2.4, 2.5};
Transform3D trans_matrix = new Transform3D(matrix);
System.out.println("trans_matrix =\n" + trans_matrix);
}
// here's the output:
verner 25% java TestTransform3D
initial trans_frustum
1.0, 0.0, 0.0, 0.0
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 1.0, 0.0
0.0, 0.0, 0.0, 1.0
trans_frustum
1.0, 0.0, 0.0, 0.0
0.0, 1.0, 0.0, 0.0
0.0, 0.0, 3.0, 4.0
0.0, 0.0, -1.0, 0.0
trans_perspective
3.91631736464594, 0.0, 0.0, 0.0
0.0, 3.91631736464594, 0.0, 0.0
0.0, 0.0, 3.0, 4.0
0.0, 0.0, -1.0, 0.0
trans_ortho
1.0, 0.0, 0.0, -0.0
0.0, 1.0, 0.0, -0.0
0.0, 0.0, 2.0, 3.0
0.0, 0.0, 0.0, 1.0
trans_ortho2
1.0, 0.0, 0.0, -0.0
0.0, 1.0, 0.0, -0.0
0.0, 0.0, 1.0, 2.0
0.0, 0.0, 0.0, 1.0
trans_translate_scale
3.0, 3.3000000000000003, 3.5999999999999996, 2.1
3.9000000000000004, 4.199999999999999, 4.5, 2.2
4.800000000000001, 5.1, 5.4, 2.3
0.0, 0.0, 0.0, 1.0
trans_matrix
1.0, 1.1, 1.2, 1.3
1.4, 1.5, 1.6, 1.7
1.8, 1.9, 2.0, 2.1
2.2, 2.3, 2.4, 2.5
verner 26%
//
}
*/
}
