de.gsi.chart.renderer.spi.marchingsquares.Cell Maven / Gradle / Ivy
package de.gsi.chart.renderer.spi.marchingsquares;
import javafx.geometry.Side;
/**
*
* A non-immutable class describing a Marching Squares Contour Cell.
*
*/
class Cell {
// static enum Side {
// LEFT,
// RIGHT,
// TOP,
// BOTTOM,
// NONE
// }
private byte cellNdx;
private final boolean flipped;
private final float left;
private final float top;
private final float right;
private final float bottom;
Cell(final int ndx, final boolean flipped, final float left, final float top, final float right,
final float bottom) {
super();
cellNdx = (byte) ndx;
if (flipped && ndx != 5 && ndx != 10) {
// System.out.println("Cell: Only saddle cells can be flipped. Will set the "
// + "'flipped' flag to FALSE for this (" + ndx + ") cell's index");
this.flipped = false;
} else {
this.flipped = flipped;
}
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
/**
*
* Clear this cell's index.
*
*
* When building up shapes, it is possible to have disjoint regions and
* holes in them. An easy way to build up a new shape from the cell's index
* is to build sub-paths for one isoline at a time. As the shape is built
* up, it is necessary to erase the (single) line afterward so that subsequent
* searches for isolines will not loop indefinitely.
*/
public void clear() {
switch (cellNdx) {
case 0:
case 5:
case 10:
case 15:
break;
default:
cellNdx = 15;
break;
}
}
/**
* @return this cell's algorithm index.
*/
public byte getCellNdx() {
return cellNdx;
}
/**
* @param edge which side crossing is wanted.
* @return crossing coordinates (already) normalized to [0.0..1.0].
*/
public float[] getXY(final Side edge) {
switch (edge) {
case BOTTOM:
return new float[] { bottom, 0.0F };
case LEFT:
return new float[] { 0.0F, left };
case RIGHT:
return new float[] { 1.0F, right };
case TOP:
return new float[] { top, 1.0F };
default:
throw new IllegalStateException("getXY: N/A w/o a non-trivial edge");
}
}
/** @return true if this Cell is a Saddle case. Returns false otherwise. */
public boolean isSaddle() {
return cellNdx == 5 || cellNdx == 10;
}
/**
* @return true if this Cell is trivial; otherwise returns false.
*/
public boolean isTrivial() {
return cellNdx == 0 || cellNdx == 15;
}
/** @return whether this cell is flipped or not. */
public boolean isFlipped() {
return flipped;
}
@Override
public String toString() {
return "Cell{index=" + cellNdx + ", flipped? " + flipped + ", left=" + left + ", top=" + top + ", right=" + right + ", bottom=" + bottom + '}';
}
}