+package eu.svjatoslav.sixth.e3d.examples.life;
+
+import eu.svjatoslav.sixth.e3d.geometry.Point3D;
+import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.composite.base.AbstractCompositeShape;
+import eu.svjatoslav.sixth.e3d.renderer.raster.shapes.composite.base.SubShape;
+
+/**
+ * This is our 2D game of life world. It contains 2D array of {@link Cell}'s.
+ */
+class Matrix extends AbstractCompositeShape {
+
+ /**
+ * Empty space between cells.
+ */
+ private static final int BORDER = 5;
+
+ /**
+ * Matrix size X and Y. (Amount of cells.)
+ */
+ private static final int SIZE = 30;
+
+ /**
+ * Object marker in 3D scene. Allows to locate all stars from the scene.
+ */
+ private static final String GROUP_STARS = "stars";
+
+ /**
+ * Object marker in 3D scene. Allows to locate surface on the scene.
+ */
+ private static final String GROUP_SURFACE = "surface";
+
+ /**
+ * 2 dimensional matrix of cells
+ */
+ private final Cell[][] cells = new Cell[SIZE][];
+
+ public Matrix(final Point3D location) {
+ super(location);
+
+
+ for (int x = 0; x < SIZE; x++) {
+ cells[x] = new Cell[SIZE];
+
+ // init Y row
+ for (int z = 0; z < SIZE; z++) {
+ // create cell and register it
+ final Cell cell = new Cell(getCellLocation(x, z));
+ cells[x][z] = cell;
+ addShape(cell);
+ }
+ }
+
+ setGroupForUngrouped(GROUP_SURFACE);
+ }
+
+ /**
+ * Clear matrix.
+ */
+ public void clear() {
+
+ // mark every cell as inactive
+ for (int x = 0; x < SIZE; x++)
+ for (int y = 0; y < SIZE; y++)
+ cells[x][y].setActive(false);
+
+ // remove history stars
+ removeGroup(GROUP_STARS);
+ }
+
+ /**
+ * Compute survived cells based on the rules of Conway's Game of Life.
+ */
+ private void computeSurvivedCells() {
+
+ for (int y = 0; y < SIZE; y++)
+ for (int x = 0; x < SIZE; x++)
+ processCell(x, y);
+
+ for (int y = 0; y < SIZE; y++)
+ for (int x = 0; x < SIZE; x++)
+ cells[x][y].setActive(cells[x][y].survives);
+
+ }
+
+ private void processCell(int x, int y) {
+ int aliveNeighbours = countNeighbours(x, y);
+
+ if (cells[x][y].isActive()) {
+ cells[x][y].survives = ((aliveNeighbours == 2) || (aliveNeighbours == 3));
+ } else {
+ cells[x][y].survives = aliveNeighbours == 3;
+ }
+ }
+
+ private int countNeighbours(int x, int y) {
+ int result = 0;
+ for (int ny = y - 1; ny <= y + 1; ny++)
+ for (int nx = x - 1; nx <= x + 1; nx++)
+ if (isCellAlive(nx, ny)) result++;
+
+ if (isCellAlive(x, y)) result--;
+
+ return result;
+ }
+
+ private boolean isCellAlive(int x, int y) {
+ if (x < 0) return false;
+ if (x >= SIZE) return false;
+ if (y < 0) return false;
+ if (y >= SIZE) return false;
+ return cells[x][y].isActive();
+ }
+
+ /**
+ * Evolve matrix for one iteration
+ */
+ public void evolve(final boolean preserveHistory) {
+ if (preserveHistory)
+ markActiveCells();
+
+ shiftStarsUp();
+
+ computeSurvivedCells();
+ }
+
+ private Point3D getCellLocation(final int x, final int z) {
+ final int shift = -((SIZE / 2) * (Cell.SIZE + BORDER));
+
+ return new Point3D(
+ (x * (Cell.SIZE + BORDER)) + shift,
+ 0,
+ (z * (Cell.SIZE + BORDER)) + shift);
+ }
+
+ /**
+ * Leave trail of active cells as stars above matrix.
+ */
+ private void markActiveCells() {
+ // mark survived cells
+ for (int x = 0; x < SIZE; x++)
+ for (int y = 0; y < SIZE; y++)
+ if (cells[x][y].isActive())
+ addShape(new Star(getCellLocation(x, y)));
+
+ setGroupForUngrouped(GROUP_STARS);
+ }
+
+ /**
+ * Find all history tracking stars and shift them up.
+ */
+ private void shiftStarsUp() {
+
+ for (final SubShape subShape : getGroup(GROUP_STARS))
+ ((Star) subShape.getShape()).getLocation().translateY(-10);
+ }
+}
projects / sixth-3d-demos.git / commitdiff
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