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H3PickViewer.java
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H3PickViewer.java
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//
// The Walrus Graph Visualization Tool.
// Copyright (C) 2000,2001,2002 The Regents of the University of California.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// ######END_HEADER######
//
import javax.media.j3d.*;
import javax.vecmath.*;
public class H3PickViewer
{
public H3PickViewer(double radius)
{
createAxes(radius);
createCircle(radius);
}
// (x, y) in image-plate coordinates
public void draw(GraphicsContext3D gc, double x, double y)
{
Vector3d t = new Vector3d(x, y, 0.0);
Transform3D translation = new Transform3D();
translation.set(t);
Transform3D transform = new Transform3D(m_imageToVworld);
transform.mul(translation);
gc.setModelTransform(transform);
gc.draw(m_axes);
gc.draw(m_circle);
}
public void setImageToVworldTransform(Transform3D transform)
{
m_imageToVworld.set(transform);
}
// ===================================================================
private void createAxes(double radius)
{
LineAttributes lineAttributes = new LineAttributes();
lineAttributes.setLineWidth(1.0f);
lineAttributes.setLineAntialiasingEnable(ANTIALIASING);
ColoringAttributes coloringAttributes =
new ColoringAttributes(0.5f, 0.5f, 0.5f,
ColoringAttributes.FASTEST);
Appearance appearance = new Appearance();
appearance.setLineAttributes(lineAttributes);
appearance.setColoringAttributes(coloringAttributes);
LineArray lines = new LineArray(4, LineArray.COORDINATES);
lines.setCoordinate(0, new Point3d(-radius, 0.0, 0.0));
lines.setCoordinate(1, new Point3d(radius, 0.0, 0.0));
lines.setCoordinate(2, new Point3d(0.0, -radius, 0.0));
lines.setCoordinate(3, new Point3d(0.0, radius, 0.0));
m_axes = new Shape3D(lines, appearance);
}
private void createCircle(double radius)
{
LineAttributes lineAttributes = new LineAttributes();
lineAttributes.setLineWidth(1.0f);
lineAttributes.setLineAntialiasingEnable(ANTIALIASING);
ColoringAttributes coloringAttributes =
new ColoringAttributes(0.5f, 0.5f, 0.5f,
ColoringAttributes.FASTEST);
Appearance appearance = new Appearance();
appearance.setLineAttributes(lineAttributes);
appearance.setColoringAttributes(coloringAttributes);
int numSegments = 72;
int[] stripLengths = { numSegments + 1 };
Point3f[] xyPoints =
createXYCircleCoordinates((float)radius, numSegments);
LineStripArray xyLines = new LineStripArray(xyPoints.length,
GeometryArray.COORDINATES,
stripLengths);
xyLines.setCoordinates(0, xyPoints);
m_circle = new Shape3D(xyLines, appearance);
}
private Point3f[] createXYCircleCoordinates(float radius, int numSegments)
{
Point3f[] retval = new Point3f[numSegments + 1];
Matrix4d rot = new Matrix4d();
for (int i = 0; i <= numSegments; i++)
{
retval[i] = new Point3f(radius, 0.0f, 0.0f);
double angle = 2.0 * Math.PI * i / numSegments;
rot.rotZ(angle);
rot.transform(retval[i]);
}
return retval;
}
// =====================================================================
private static final boolean ANTIALIASING = false;
private Transform3D m_imageToVworld = new Transform3D();
private Shape3D m_axes;
private Shape3D m_circle;
}