package mocap.scene;
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import java.awt.Font;
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import java.util.ArrayList;
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import javax.media.j3d.Appearance;
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import javax.media.j3d.BranchGroup;
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import javax.media.j3d.PolygonAttributes;
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import javax.media.j3d.Transform3D;
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import javax.media.j3d.TransformGroup;
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import javax.vecmath.Color3f;
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import javax.vecmath.Point3f;
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import javax.vecmath.Vector3d;
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import com.sun.j3d.utils.geometry.Text2D;
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/**
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* The floor is a green grid, with a small red square
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* at the (0,0) position on the (X,Z) plane, and with numbers along
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* the X- and Z- axes.
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*/
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public class Floor
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{
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private final static int FLOOR_LEN = 30; // should be even
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private final static Color3f CENTER_MARK_RED = new Color3f(0.7f, 0f, 0f);
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private final static Color3f NUMBERS_COLOR = new Color3f(.3f, .3f, .3f);
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private final static Color3f GRID_COLOR = new Color3f(.2f, .2f, .2f);
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private BranchGroup _floorBG;
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/**
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* create tiles, add origin marker, then the axes labels
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*/
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public Floor()
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{
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ArrayList blueCoords = new ArrayList();
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_floorBG = new BranchGroup();
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for (int z = -FLOOR_LEN / 2; z <= (FLOOR_LEN / 2) - 1; z++) {
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for (int x = -FLOOR_LEN / 2; x <= (FLOOR_LEN / 2) - 1; x++) {
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createCoords(x, z, blueCoords);
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}
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}
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_floorBG.addChild(new Tiles(blueCoords, GRID_COLOR));
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addOriginMarker();
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labelAxes();
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}
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/**
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* Coors for a single square.
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* Its left hand corner at (x,0,z)
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*/
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private void createCoords(int x, int z, ArrayList coords)
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{
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// points created in counter-clockwise order
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Point3f p1 = new Point3f(x, 0.0f, z + 1.0f);
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Point3f p2 = new Point3f(x + 1.0f, 0.0f, z + 1.0f);
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Point3f p3 = new Point3f(x + 1.0f, 0.0f, z);
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Point3f p4 = new Point3f(x, 0.0f, z);
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coords.add(p1);
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coords.add(p2);
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coords.add(p3);
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coords.add(p4);
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}
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private void addOriginMarker() // A red square centered at (0,0,0), of length 1
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{ // points created counter-clockwise, a bit above the floor
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Point3f p1 = new Point3f(-0.5f, 0.01f, 0.5f);
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Point3f p2 = new Point3f(0.5f, 0.01f, 0.5f);
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Point3f p3 = new Point3f(0.5f, 0.01f, -0.5f);
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Point3f p4 = new Point3f(-0.5f, 0.01f, -0.5f);
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ArrayList oCoords = new ArrayList();
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oCoords.add(p1);
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oCoords.add(p2);
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oCoords.add(p3);
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oCoords.add(p4);
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_floorBG.addChild(new Tiles(oCoords, CENTER_MARK_RED));
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}
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private void labelAxes() // Place numbers along the X- and Z-axes at the integer positions
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{
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Vector3d pt = new Vector3d();
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for (int i = -FLOOR_LEN / 2; i <= FLOOR_LEN / 2; i++) {
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pt.x = i;
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_floorBG.addChild(makeText(pt, "" + i)); // along x-axis
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}
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pt.x = 0;
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for (int i = -FLOOR_LEN / 2; i <= FLOOR_LEN / 2; i++) {
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pt.z = i;
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_floorBG.addChild(makeText(pt, "" + i)); // along z-axis
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}
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}
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private TransformGroup makeText(Vector3d vertex, String text) // Create a Text2D object at the specified vertex
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{
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Text2D message = new Text2D(text, NUMBERS_COLOR, "SansSerif", 24, Font.BOLD);
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// 36 point bold Sans Serif
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Appearance app = message.getAppearance();
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PolygonAttributes polyAttrib = new PolygonAttributes();
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polyAttrib.setCullFace(PolygonAttributes.CULL_NONE);
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polyAttrib.setBackFaceNormalFlip(true);
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app.setPolygonAttributes(polyAttrib);
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TransformGroup tg = new TransformGroup();
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Transform3D t3d = new Transform3D();
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t3d.setTranslation(vertex);
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tg.setTransform(t3d);
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tg.addChild(message);
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return tg;
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}
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public BranchGroup getBG()
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{
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return _floorBG;
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}
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}
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