feat: render multidokus

app/src/main/java/sudoku/structure/Sudoku.java

@@ -46,13 +46,19 @@ public class Sudoku {
 		return index < getSize() * getSize();
 	}
 
-	public boolean tryPlaceCellSymbol(int x, int y, int value) {
-		assert (isValidCoords(x, y));
+	public boolean canBePlaced(int x, int y, int value) {
 		for (IConstraint constraint : this.constraints) {
 			if (!constraint.canBePlaced(this, x, y, value)) {
 				return false;
 			}
 		}
+		return true;
+	}
+
+	public boolean tryPlaceCellSymbol(int x, int y, int value) {
+		assert (isValidCoords(x, y));
+		if (!canBePlaced(x, y, value))
+			return false;
 		Cell cell = getCell(x, y);
 		cell.setSymbolIndex(value);
 		return true;
@@ -293,4 +299,9 @@ public class Sudoku {
 
 		return true;
 	}
+
+	public void setBlockWidth(int blockWidth) {
+		this.blockWidth = blockWidth;
+	}
+
 }