package Anim;
// CheckerFloor.java
// Andrew Davison, April 2005, ad@fivedots.coe.psu.ac.th
/* The floor is a blue and green chessboard, with a small red square
at the (0,0) position on the (X,Z) plane, and with numbers along
the X- and Z- axes.
*/
import java.awt.*;
import javax.media.j3d.*;
import com.sun.j3d.utils.geometry.Text2D;
import javax.vecmath.*;
import java.util.ArrayList;
public class CheckerFloor
{
private final static int FLOOR_LEN = 20; // should be even
// colours for floor, etc
private final static Color3f blue = new Color3f(0.0f, 0.1f, 0.4f);
private final static Color3f green = new Color3f(0.0f, 0.5f, 0.1f);
private final static Color3f medRed = new Color3f(0.8f, 0.4f, 0.3f);
private final static Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
private BranchGroup floorBG;
public CheckerFloor()
// create tiles, add origin marker, then the axes labels
{
ArrayList blueCoords = new ArrayList();
ArrayList greenCoords = new ArrayList();
floorBG = new BranchGroup();
boolean isBlue;
for(int z=-FLOOR_LEN/2; z <= (FLOOR_LEN/2)-1; z++) {
isBlue = (z%2 == 0)? true : false; // set colour for new row
for(int x=-FLOOR_LEN/2; x <= (FLOOR_LEN/2)-1; x++) {
if (isBlue)
createCoords(x, z, blueCoords);
else
createCoords(x, z, greenCoords);
isBlue = !isBlue;
}
}
floorBG.addChild( new ColouredTiles(blueCoords, blue) );
floorBG.addChild( new ColouredTiles(greenCoords, green) );
addOriginMarker();
labelAxes();
} // end of CheckerFloor()
private void createCoords(int x, int z, ArrayList coords)
// Coords for a single blue or green square,
// its left hand corner at (x,0,z)
{
// points created in counter-clockwise order
Point3f p1 = new Point3f(x, 0.0f, z+1.0f);
Point3f p2 = new Point3f(x+1.0f, 0.0f, z+1.0f);
Point3f p3 = new Point3f(x+1.0f, 0.0f, z);
Point3f p4 = new Point3f(x, 0.0f, z);
coords.add(p1); coords.add(p2);
coords.add(p3); coords.add(p4);
} // end of createCoords()
private void addOriginMarker()
// A red square centered at (0,0,0), of length 0.5
{ // points created counter-clockwise, a bit above the floor
Point3f p1 = new Point3f(-0.25f, 0.01f, 0.25f);
Point3f p2 = new Point3f(0.25f, 0.01f, 0.25f);
Point3f p3 = new Point3f(0.25f, 0.01f, -0.25f);
Point3f p4 = new Point3f(-0.25f, 0.01f, -0.25f);
ArrayList oCoords = new ArrayList();
oCoords.add(p1); oCoords.add(p2);
oCoords.add(p3); oCoords.add(p4);
floorBG.addChild( new ColouredTiles(oCoords, medRed) );
} // end of addOriginMarker();
private void labelAxes()
// Place numbers along the X- and Z-axes at the integer positions
{
Vector3d pt = new Vector3d();
for (int i=-FLOOR_LEN/2; i <= FLOOR_LEN/2; i++) {
pt.x = i;
floorBG.addChild( makeText(pt,""+i) ); // along x-axis
}
pt.x = 0;
for (int i=-FLOOR_LEN/2; i <= FLOOR_LEN/2; i++) {
pt.z = i;
floorBG.addChild( makeText(pt,""+i) ); // along z-axis
}
} // end of labelAxes()
private TransformGroup makeText(Vector3d vertex, String text)
// Create a Text2D object at the specified vertex
{
Text2D message = new Text2D(text, white, "SansSerif", 36, Font.BOLD );
// 36 point bold Sans Serif
TransformGroup tg = new TransformGroup();
Transform3D t3d = new Transform3D();
t3d.setTranslation(vertex);
tg.setTransform(t3d);
tg.addChild(message);
return tg;
} // end of getTG()
public BranchGroup getBG()
{ return floorBG; }
} // end of CheckerFloor class