Move (most) hardcoded defaults to MazeDefault

- harcoded values centralized
- IntegerField for JTextField containing numbers
- fix, can draw even if topleft position is not (0,0) ( ie if scrollbar were used )

java/org/artisanlogiciel/games/maze/gui/MazeCellParameters.java

@@ -8,26 +8,22 @@ import org.artisanlogiciel.games.maze.solve.DirectionPosition;
 import java.awt.*;
 
 public class MazeCellParameters {
-    double width = 10; // width of one cell
-    double height = 10; // height of one cell
-    int offsetX = 5; // x offset of upper corner left
-    int offsetY = 5; // y offset of upper corner left
+    int offsetX; // x offset of upper corner left in pixels
+    int offsetY; // y offset of upper corner left in pixers
 
-    int mapWidth = 0;
-    int mapHeight = 0;
+    int mapWidth;
+    int mapHeight;
+
+    // computed see adaptTo
+    double width; // width of one cell in pixels
+    double height; // height of one cell in pixels
 
     public MazeCellParameters(int mapw, int maph, int W, int H, int x, int y) {
-        double w = (W - x) / mapw;
-        double h = (H - y) / maph;
         mapWidth = mapw;
         mapHeight = maph;
-        if (w < 5)
-            w = 5;
-        if (h < 5)
-            h = 5;
-        setCellSize(w, h);
         offsetX = x;
         offsetY = y;
+        adaptTo(W,H);
     }
 
     public void resetMazeWidthHeight(int mapw, int maph) {
@@ -38,8 +34,6 @@ public class MazeCellParameters {
     public void adaptTo(double W, double H) {
         double w = (W - offsetX) / mapWidth;
         double h = (H - offsetY) / mapHeight;
-        mapWidth = mapWidth;
-        mapHeight = mapHeight;
         if (w < 5)
             w = 5;
         if (h < 5)
@@ -47,6 +41,13 @@ public class MazeCellParameters {
         setCellSize(w, h);
     }
 
+    // for a given (x,y) pixel return cell position.
+    Position toMazeCoordinates(int x, int y) {
+        int pX = (int) ((double) (x - getOffsetX()) / getWidth());
+        int pY = (int) ((double) (y - getOffsetY()) / getHeight());
+        return new Position(pX, pY);
+    }
+
     public void setCellSize(double w, double h) {
         width = w;
         height = h;