jens@0: /*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
jens@0:     http://developer.apple.com/samplecode/GeekGameBoard/
jens@0:     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
jens@0: 
jens@0:     Redistribution and use in source and binary forms, with or without modification, are permitted
jens@0:     provided that the following conditions are met:
jens@0: 
jens@0:     * Redistributions of source code must retain the above copyright notice, this list of conditions
jens@0:       and the following disclaimer.
jens@0:     * Redistributions in binary form must reproduce the above copyright notice, this list of
jens@0:       conditions and the following disclaimer in the documentation and/or other materials provided
jens@0:       with the distribution.
jens@0: 
jens@0:     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
jens@0:     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
jens@0:     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
jens@0:     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jens@0:     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
jens@0:     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
jens@0:     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
jens@0:     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jens@0: */
jens@0: #import "BitHolder.h"
jens@0: @class GridCell;
jens@0: 
jens@0: 
jens@0: /** Abstract superclass of regular geometric grids of GridCells that Bits can be placed on. */
jens@0: @interface Grid : CALayer
jens@0: {
jens@0:     unsigned _nRows, _nColumns;                         
jens@0:     CGSize _spacing;                                    
jens@0:     Class _cellClass;                                   
jens@0:     CGColorRef _cellColor, _lineColor;                  
jens@0:     BOOL _usesDiagonals, _allowsMoves, _allowsCaptures;
jens@0:     NSMutableArray *_cells;                             // Really a 2D array, in row-major order.
jens@0: }
jens@0: 
jens@0: /** Initializes a new Grid with the given dimensions and cell size, and position in superview.
jens@0:     Note that a new Grid has no cells! Either call -addAllCells, or -addCellAtRow:column:. */
jens@0: - (id) initWithRows: (unsigned)nRows columns: (unsigned)nColumns
jens@0:             spacing: (CGSize)spacing
jens@0:            position: (CGPoint)pos;
jens@0: 
jens@0: /** Initializes a new Grid with the given dimensions and frame in superview.
jens@0:     The cell size will be computed by dividing frame size by dimensions.
jens@0:     Note that a new Grid has no cells! Either call -addAllCells, or -addCellAtRow:column:. */
jens@0: - (id) initWithRows: (unsigned)nRows columns: (unsigned)nColumns
jens@0:               frame: (CGRect)frame;
jens@0: 
jens@0: @property Class cellClass;                      // What kind of GridCells to create
jens@0: @property (readonly) unsigned rows, columns;    // Dimensions of the grid
jens@0: @property (readonly) CGSize spacing;            // x,y spacing of GridCells
jens@0: @property CGColorRef cellColor, lineColor;      // Cell background color, line color (or nil)
jens@0: @property BOOL usesDiagonals;                   // Affects GridCell.neighbors, for rect grids
jens@0: @property BOOL allowsMoves, allowsCaptures;     // Can pieces be moved, and can they land on others?
jens@0: 
jens@0: /** Returns the GridCell at the given coordinates, or nil if there is no cell there.
jens@0:     It's OK to call this with off-the-board coordinates; it will just return nil.*/
jens@0: - (GridCell*) cellAtRow: (unsigned)row column: (unsigned)col;
jens@0: 
jens@0: /** Adds cells at all coordinates, creating a complete grid. */
jens@0: - (void) addAllCells;
jens@0: 
jens@0: /** Adds a GridCell at the given coordinates. */
jens@0: - (GridCell*) addCellAtRow: (unsigned)row column: (unsigned)col;
jens@0: 
jens@0: /** Removes a particular cell, leaving a blank space. */
jens@0: - (void) removeCellAtRow: (unsigned)row column: (unsigned)col;
jens@0: 
jens@0: 
jens@0: // protected:
jens@0: - (GridCell*) createCellAtRow: (unsigned)row column: (unsigned)col 
jens@0:                suggestedFrame: (CGRect)frame;
jens@0: 
jens@0: @end
jens@0: 
jens@0: 
jens@0: /** Abstract superclass of a single cell in a grid. */
jens@0: @interface GridCell : BitHolder
jens@0: {
jens@0:     Grid *_grid;
jens@0:     unsigned _row, _column;
jens@0: }
jens@0: 
jens@0: - (id) initWithGrid: (Grid*)grid 
jens@0:                 row: (unsigned)row column: (unsigned)col
jens@0:               frame: (CGRect)frame;
jens@0: 
jens@0: @property (readonly) Grid* grid;
jens@0: @property (readonly) unsigned row, column;
jens@0: @property (readonly) NSArray* neighbors;        // Dependent on grid.usesDiagonals
jens@0: 
jens@0: /** Returns YES if 'forward' is north (increasing row#) for the current player */
jens@0: @property (readonly) BOOL fwdIsN;
jens@0: 
jens@0: /* Go-style group detection. Returns the set of contiguous GridCells that have pieces of the same
jens@0:    owner as this one, and optionally a count of the number of "liberties", or adjacent empty cells. */
jens@0: - (NSSet*) getGroup: (int*)outLiberties;
jens@0: 
jens@0: // protected:
jens@0: - (void) drawInParentContext: (CGContextRef)ctx fill: (BOOL)fill;
jens@0: @end
jens@0: 
jens@0: 
jens@0: 
jens@0: /** A rectangular grid of squares. */
jens@0: @interface RectGrid : Grid
jens@0: {
jens@0:     CGColorRef _altCellColor;
jens@0: }
jens@0: 
jens@0: /** If non-nil, alternate cells will be drawn with this background color, in a checkerboard pattern.
jens@0:     The precise rule is that cells whose row+column is odd use the altCellColor.*/
jens@0: @property CGColorRef altCellColor;
jens@0: 
jens@0: @end
jens@0: 
jens@0: 
jens@0: 
jens@0: /* A square in a RectGrid */
jens@0: @interface Square : GridCell
jens@0: 
jens@0: @property (readonly) Square *nw, *n, *ne, *e, *se, *s, *sw, *w;    // Absolute directions (n = increasing row#)
jens@0: @property (readonly) Square *fl, *f, *fr, *r, *br, *b, *bl, *l;    // Relative to player (upside-down for player 2)
jens@0: 
jens@0: @end
jens@0: 
jens@0: 
jens@0: /* Substitute this for Square in a RectGrid's cellClass to draw the lines through the centers
jens@0:    of the squares, so the pieces sit on the intersections, as in a Go board. */
jens@0: @interface GoSquare : Square
jens@0: {
jens@0:     BOOL _dotted;
jens@0: }
jens@0: 
jens@0: /** Set to YES to put a dot at the intersection, as in the handicap points of a Go board. */
jens@0: @property BOOL dotted;
jens@0: 
jens@0: @end