feat: day 1 progress

src/main/java/eu/midnightdust/yaytris/game/Tetromino.java

@@ -0,0 +1,40 @@
+package eu.midnightdust.yaytris.game;
+
+import eu.midnightdust.yaytris.util.Vec2i;
+
+import java.awt.*;
+
+public class Tetromino {
+    private final TetrominoShape shape;
+    private int[][] collision;
+    private Vec2i centerPos;
+
+    public Tetromino(TetrominoShape shape) {
+        this.shape = shape;
+        this.collision = shape.boundary;
+        this.centerPos = Vec2i.of(0, 0);
+    }
+
+    public void fall(int length) {
+        centerPos = centerPos.offset(Vec2i.of(0, length));
+    }
+
+    public void rotate() {
+        int[][] newCollision = new int[collision[0].length][collision.length];
+        for (int i = 0; i < collision.length; i++) {
+            for (int j = 0; j < collision[i].length; j++) {
+                newCollision[j][i] = collision[i][j];
+            }
+        }
+        this.collision = newCollision;
+    }
+
+    public Color[] getLine(int line) {
+        Color[] l = new Color[7];
+        for (int i = 0; i < l.length; i++) {
+            if (collision.length < line-centerPos.getX() && collision[line-centerPos.getX()][i] != 0)
+                l[i] = shape.color;
+        }
+        return l;
+    }
+}