Hex areas and use for Deployment, Flee Zones and Triggers

megamek/data/scenarios/Kell Hounds/DeathOfTheLegion/DeathOfTheLegion.mms

@@ -33,8 +33,6 @@ map:
       modify: rotate
 
 factions:
-#- name: Obser
-
 
 - name: Mek Company, Kell Hounds
   camo: Mercs/Kell Hounds.jpg

megamek/data/scenarios/Kell Hounds/LoweringTheBoom/LoweringTheBoom.mms

@@ -51,6 +51,9 @@ factions:
         atleast: 4
       modify: onlyatend
 
+  fleefrom:
+    border: north
+
   units:
   - fullname: Thunderbolt TDR-5S
     id: 101
@@ -250,9 +253,6 @@ messages:
       as many Meks as possible.
 
       Be careful! Some of your Meks have already sustained damage.
-
-      *Technical note: you can currently retreat off any edge of the battlefield and it will count for victory.
-      If you do this, Princess will be sad.*
     image: loweringboom_map.png
     trigger:
       type: and

megamek/data/scenarios/Kell Hounds/ToSaveAPrince/ToSaveAPrince.mms

@@ -43,6 +43,9 @@ factions:
   camo: Draconis Combine/Dieron Regulars/Dieron Regulars.jpg
   deploy: N
 
+  fleefrom:
+    border: south
+
   victory:
     - trigger:
         type: fledunits
@@ -164,6 +167,7 @@ factions:
       piloting: 4
       gunnery: 5
 
+# OPFOR -----------------------
 
 - name: Kell Hounds, Second Battalion
   camo: Mercs/Kell Hounds.jpg
@@ -321,9 +325,6 @@ messages:
       Meks off the southern map edge by the end of round 15.
 
       The temperature in this desert area is at 70°C, adding heat to all Meks.
-
-      *Technical note: you can currently retreat off any edge of the battlefield and it will count for victory.
-      If you do this, Princess will be sad.*
     image: tosaveaprince_map.png
     trigger:
       type: and
@@ -389,6 +390,7 @@ end:
   - trigger:
       type: killedunits
       units: [ 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112 ]
+      # can't get through with half the force anymore when 7 are killed
       atleast: 7
 
   - trigger:

megamek/docs/Scenarios/ScenarioV2 HowTo.mms

@@ -188,6 +188,19 @@ factions:
       offset: 0
       # width is 3 by default
       width: 1
+    # OR
+    deploy:
+      # see also area definitions
+      area:
+        union:
+          first:
+            circle:
+              center: [ 10, 10 ]
+              radius: 7
+          second:
+            list:
+              - [2,2]
+              - [5,5]
 
     minefields:                               # optional, availability depending on game type
     - conventional: 2
@@ -491,3 +504,161 @@ trigger:
     - type: phasestart
       phase: movement
 
+trigger:
+  # The positions condition is met when the given number(s) of units are in the given area
+  type: positions
+  area:
+    border:
+      edges: north
+      maxdistance: 3
+  # Optional: limit the test to the player's units
+  player: Player A
+  # Optional: a list of units to limit the check to. This makes sense most of time to avoid counting MekWarriors
+  # or other spawns; when giving unit IDs, the player limitation is redundant
+  # It also makes sense to set fixed IDs for all units to make sure this works correctly
+  units: [ 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112 ]
+  # At least the given number of units must be in the given area, can be alone or combined with atmost
+  atleast: 7
+  # At most the given number of units must be in the given area, can be alone or combined with atleast
+  atmost: 10
+  # OR: the exact number of units must be in the given area; this cannot be combined with atmost/atleast
+  count: 2
+
+trigger:
+  # This is a simpler way to write a position condition that is met when the unit is in the given area
+  type: position
+  area:
+    border:
+      edges: north
+      maxdistance: 3
+  # The unit ID to be checked
+  unit: 201
+
+# ###############################################
+# Areas
+# are used to define places on the map. They are either a single shape or a combination of shapes. They are
+# never given as a list, only a single element that is either the shape or the combination type.
+# Areas need not be contiguous
+area:
+  # Combinations are union, difference and intersection (as in "Constructive Solid Geometry")
+  # Each combination requires the "first:" and "second:" area to be given. These are areas in turn, i.e.,
+  # they are themselves either shapes or combinations. In other words, this can be nested to any depth.
+  union:
+    first:
+      # A hex circle (or more like, hex-shape) is all hexes around the center at a distance of at most the
+      # given radius (the circle is filled). To get only the hexes at the distance 7, use a difference
+      # of two circles, the second of radius 6 can be used.
+      circle:
+        center: [ 10, 10 ]
+        radius: 7
+    # In union and intersection, it does not matter which area is first and second. In a difference, the second
+    # area is subtracted from the first, so reversing the two changes the result.
+    second:
+      # A list is simply a list of hex coordinates
+      list:
+        - [2,2]
+        - [5,5]
+
+area:
+  difference:
+    first:
+      # A rectangle is given by its corners. The order of the values does not matter, i.e. the corners can be
+      # upper left and lower right or upper right and lower left in any order. The rectangle is filled and includes
+      # its border
+      rectangle:
+        - [ 2, 2 ]
+        - [ 5, 5 ]
+    second:
+      # Subtracting a smaller rectangle leaves the border of the first rectangle
+      rectangle:
+        - [ 4, 4 ]
+        - [ 3, 3 ]
+
+area:
+  # There are two versions of halfplane
+  # One is cartesian, i.e. vertical or horizontal, i.e. all hexes above, below, to left or to right of a
+  # given coordinate value, including the coordinate (line) itself
+  halfplane:
+    coordinate: 4
+    # The direction the halfplane extends to: above, below, left or right. A toleft halfplane includes all
+    # hexes of x <= coordinate
+    extends: above
+
+  # The other is delimited by a hex row in one of the 3 directions N/S, NE/SW and NW/SE. The plane extends to
+  # either the right or left of that (there is no above/below, as the hex row cannot be horizontal). The
+  # directions are, as always N = 0, SE = 2 ...; opposite directions have the same result
+  halfplane:
+    point: [4,5]
+    direction: 2
+    # The direction the halfplane extends to: above, below, to_left or to_right. A toleft halfplane includes all
+    # hexes of x <= coordinate
+    extends: left
+
+area:
+  intersection:
+    first:
+      # A line along one of the hex row directions (N = 0, SE = 2; opposite directions have the same result)
+      # through one hex; the line is infinite
+      line:
+        point: [ 0, 5 ]
+        direction: 1
+    second:
+      union:
+        first:
+          # A ray along one of the hex row directions (N = 0, SE = 2) starting at a hex; the ray is similar to the
+          # line with the same values but it is cut off at the hex (the ray includes the start hex)
+          ray:
+            point: [ 0, 5 ]
+            direction: 1
+        second:
+          # This area is the north border of the board (all hexes with y = 0)
+          border: north
+
+area:
+  # Two or more borders of the board can be given as a list.
+  # The absolute hexes that these represent depend on
+  # the rectangle that the area is applied to (e.g. the board size)
+  # The east (left) border is all hexes at x = 0; south is all hexes at y = board height; west all hexes at
+  # x = board width
+  border: [ south, east, west ]
+
+area:
+  # for a thicker border or inset border, use the "edges:" node
+  border:
+    edges: [ east, north ]
+    # optional: the minimum distance from the edge; 0 means start at the edge hexes
+    mindistance: 2
+    # optional: the maximum distance from the edge
+    maxdistance: 3
+
+area:
+  # The empty area has no hexes. Can be used to prevent units from fleeing the board
+  empty:
+
+area:
+  # the area can be given as a terrain type
+  terrain:
+    # required: the terrain type to include in the area
+    type: woods
+    # optional: the terrain level to include; when omitted, any terrain level is included
+    level: 1
+    # OR optional: a range of terrain levels to include
+    minlevel: 1
+    maxlevel: 2
+    # optional: the minimum distance from any hex with the terrain; 0 means only the hexes themselves
+    mindistance: 2
+    # optional: the maximum distance from any hex with the terrain
+    # be careful with distances of more than 3 or so on big boards: this leads to exploding calculation times
+    maxdistance: 3
+
+area:
+  # the area can be given as hex levels to include
+  # either a single hex level
+  hexlevel: 0
+
+area:
+  # OR a range
+  hexlevel:
+    minlevel: 1
+    # optional: the maximum hex level
+    maxlevel: 2

megamek/i18n/megamek/client/messages.properties

@@ -1111,6 +1111,8 @@ CommonMenuBar.viewToggleFovDarkenTooltip=<html>Darkens hexes with no LOS to the
 CommonMenuBar.viewToggleIsometric=Isometric View
 CommonMenuBar.viewToggleFieldOfFire=Field of Fire
 CommonMenuBar.viewToggleFieldOfFireToolTip=Outline firing arcs for selected weapons
+CommonMenuBar.viewToggleFleeZone=Toggle Flee Zone
+CommonMenuBar.viewToggleFleeZoneToolTip=Shows or hides the flee zone of the current unit (the hexes from which it can escape the battlefield)
 CommonMenuBar.viewToggleSensorRange=Visual & Sensor Ranges
 CommonMenuBar.viewToggleSensorRangeToolTip=Outline Visual & Sensor Ranges
 CommonMenuBar.viewToggleFiringSolutions=Firing Solutions

megamek/src/megamek/client/bot/princess/BotGeometry.java

@@ -108,17 +108,19 @@ public String toString() {
      * Coords stores x and y values. Since these are hexes, coordinates with odd x
      * values are a half-hex down. Directions work clockwise around the hex,
      * starting with zero at the top.
-     * -y
-     * 0
-     * _____
-     * 5 / \ 1
-     * -x / \ +x
-     * \ /
-     * 4 \_____/ 2
-     * 3
-     * +y
+     * <pre>
+     *       -y
+     *        0
+     *      _____
+     *   5 /     \ 1
+     * -x /       \ +x
+     *    \       /
+     *   4 \_____/ 2
+     *        3
+     *       +y
+     * </pre>
      * ------------------------------
-     * Direction is stored as above, but the meaning of 'intercept' depends
+     * <BR>Direction is stored as above, but the meaning of 'intercept' depends
      * on the direction. For directions 0, 3, intercept means the y=0 intercept
      * for directions 1, 2, 4, 5 intercept is the x=0 intercept
      */
@@ -144,6 +146,8 @@ public HexLine(Coords c, int dir) {
          * returns -1 if the point is to the left of the line
          * +1 if the point is to the right of the line
          * and 0 if the point is on the line
+         * Note that this evaluation depends on the "view" direction of this line. The
+         * result is reversed for HexLines of opposite directions, e.g. directions 0 and 3.
          */
         public int judgePoint(Coords c) {
             HexLine comparor = new HexLine(c, getDirection());
@@ -156,6 +160,24 @@ public int judgePoint(Coords c) {
             return 0;
         }
 
+        /**
+         * @return -1 if the point is to the left of the line,
+         * +1 if the point is to the right of the line
+         * and 0 if the point is on the line
+         * Note that this evaluation is independent of the "view" direction of this line. The
+         * result is the same for HexLines of opposite directions, e.g. directions 0 and 3.
+         */
+        public int isAbsoluteLeftOrRight(Coords c) {
+            HexLine comparor = new HexLine(c, getDirection());
+            if (comparor.getIntercept() == getIntercept()) {
+                return 0;
+            } else if (comparor.getIntercept() < getIntercept()) {
+                return ((getDirection() == 2) || (getDirection() == 5)) ? 1 : -1;
+            } else {
+                return ((getDirection() == 2) || (getDirection() == 5)) ? -1 : 1;
+            }
+        }
+
         /**
          * returns -1 if the area is entirely to the left of the line
          * returns +1 if the area is entirely to the right of the line

megamek/src/megamek/client/ui/swing/ClientGUI.java

@@ -166,6 +166,7 @@ public class ClientGUI extends AbstractClientGUI implements BoardViewListener,
     public static final String VIEW_TOGGLE_HEXCOORDS = "viewToggleHexCoords";
     public static final String VIEW_LABELS = "viewLabels";
     public static final String VIEW_TOGGLE_FIELD_OF_FIRE = "viewToggleFieldOfFire";
+    public static final String VIEW_TOGGLE_FLEE_ZONE = "viewToggleFleeZone";
     public static final String VIEW_TOGGLE_SENSOR_RANGE = "viewToggleSensorRange";
     public static final String VIEW_TOGGLE_FOV_DARKEN = "viewToggleFovDarken";
     public static final String VIEW_TOGGLE_FOV_HIGHLIGHT = "viewToggleFovHighlight";
@@ -244,6 +245,7 @@ public class ClientGUI extends AbstractClientGUI implements BoardViewListener,
     private BoardView bv;
     private MovementEnvelopeSpriteHandler movementEnvelopeHandler;
     private MovementModifierSpriteHandler movementModifierSpriteHandler;
+    private FleeZoneSpriteHandler fleeZoneSpriteHandler;
     private SensorRangeSpriteHandler sensorRangeSpriteHandler;
     private CollapseWarningSpriteHandler collapseWarningSpriteHandler;
     private GroundObjectSpriteHandler groundObjectSpriteHandler;
@@ -351,6 +353,8 @@ public class ClientGUI extends AbstractClientGUI implements BoardViewListener,
 
     private Coords currentHex;
 
+    private boolean showFleeZone = false;
+
     // endregion Variable Declarations
 
     /**
@@ -509,10 +513,11 @@ private void initializeSpriteHandlers() {
         groundObjectSpriteHandler = new GroundObjectSpriteHandler(bv, client.getGame());
         firingSolutionSpriteHandler = new FiringSolutionSpriteHandler(bv, client);
         firingArcSpriteHandler = new FiringArcSpriteHandler(bv, this);
+        fleeZoneSpriteHandler = new FleeZoneSpriteHandler(bv);
 
-        spriteHandlers.addAll(List.of(movementEnvelopeHandler, movementModifierSpriteHandler,
-                sensorRangeSpriteHandler, flareSpritesHandler, collapseWarningSpriteHandler,
-                groundObjectSpriteHandler, firingSolutionSpriteHandler, firingArcSpriteHandler));
+        spriteHandlers.addAll(List.of(movementEnvelopeHandler, movementModifierSpriteHandler, sensorRangeSpriteHandler,
+            flareSpritesHandler, collapseWarningSpriteHandler, groundObjectSpriteHandler, firingSolutionSpriteHandler,
+            firingArcSpriteHandler, fleeZoneSpriteHandler));
         spriteHandlers.forEach(BoardViewSpriteHandler::initialize);
     }
 
@@ -925,6 +930,9 @@ public void actionPerformed(ActionEvent event) {
                 GUIP.setShowFieldOfFire(!GUIP.getShowFieldOfFire());
                 bv.getPanel().repaint();
                 break;
+            case VIEW_TOGGLE_FLEE_ZONE:
+                toggleFleeZone();
+                break;
             case VIEW_TOGGLE_SENSOR_RANGE:
                 GUIP.setShowSensorRange(!GUIP.getShowSensorRange());
                 break;
@@ -2217,6 +2225,7 @@ public void gamePhaseChange(GamePhaseChangeEvent e) {
 
             clientGuiPanel.validate();
             cb.moveToEnd();
+            hideFleeZone();
         }
 
         @Override
@@ -3093,4 +3102,19 @@ public void setCurrentHex(Hex hex) {
     public void setCurrentHex(Coords hex) {
         currentHex = hex;
     }
+
+    private void toggleFleeZone() {
+        showFleeZone = !showFleeZone;
+        if (showFleeZone && unitDisplay.getCurrentEntity() != null) {
+            Game game = client.getGame();
+            fleeZoneSpriteHandler.renewSprites(game.getFleeZone(unitDisplay.getCurrentEntity()).getCoords(game.getBoard()));
+        } else {
+            fleeZoneSpriteHandler.clear();
+        }
+    }
+
+    public void hideFleeZone() {
+        showFleeZone = false;
+        fleeZoneSpriteHandler.clear();
+    }
 }