add actors/HexMap

1 files changed, 79 insertions, 0 deletions

diff --git a/core/src/ch/asynk/tankontank/actors/HexMap.java b/core/src/ch/asynk/tankontank/actors/HexMap.java
new file mode 100644
index 0000000..559aeef
--- /dev/null
+++ b/core/src/ch/asynk/tankontank/actors/HexMap.java
@@ -0,0 +1,79 @@
+package ch.asynk.tankontank.actors;
+
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.scenes.scene2d.ui.Image;
+
+import com.badlogic.gdx.math.Vector2;
+
+public class HexMap extends Image
+{
+    static final int x0 = 83;       // map offset
+    static final int y0 = 182;      // map offset
+    static final int h = 110;       // hex side
+    static final float dh = 53.6f;  // hex top     should be h/2
+    static final int w = 189;       // hex width
+    static final int dw = 94;       // half hex    should be w/2
+    static final float H = h + dh;  // total height
+    static final float slope = (dh / (float) dw);
+
+    private int cols;
+    private int rows;
+    public Vector2 cell = new Vector2();
+
+    public HexMap(int cols, int rows, Texture texture)
+    {
+        super(texture);
+        this.cols = cols;
+        this.rows = rows;
+    }
+
+    public void selectCell(float cx, float cy)
+    {
+        // compute row
+        int row;
+        boolean oddRow = true;
+        float y = (cy - y0);
+        if (y < 0.f) {
+            row = -1;
+        } else {
+            row = (int) (y / H);
+            oddRow = ((row % 2) == 1);
+        }
+
+        // compute col
+        int col;
+        float x = (cx - x0);
+        if (oddRow) x -= dw;
+        if (x < 0.f) {
+            col = -1;
+        } else {
+            col = (int) (x / w);
+        }
+
+        // check upper boundaries
+        float dy = (y - (row * H));
+        if (dy > h) {
+            dy -= h;
+            float dx = (x - (col * w));
+            if (dx < dw) {
+                if ((dx * slope) < dy) {
+                    row += 1;
+                    if (!oddRow) col -= 1;
+                    oddRow = !oddRow;
+                }
+            } else {
+                if (((w - dx) * slope) < dy) {
+                    row += 1;
+                    if (oddRow) col += 1;
+                    oddRow = !oddRow;
+                }
+            }
+        }
+
+        // validate cell
+        if ((col < 0) || (row < 0) || (row > rows) || (col > cols) || (oddRow && ((col +1)> cols)))
+            cell.set(-1, -1);
+        else
+            cell.set(col, row);
+    }
+}