HeptaFish MapEditor中画网格的算法
private var _mapWidth:int;private var _mapHeight:int;private var _tilePixelWidth:int;private var _tilePixelHeight:int;private var _wHalfTile:int;private var _hHalfTile:int;public function DrawGridThree(mapWidth:int, mapHeight:int, tilePixelWidth:int, tilePixelHeight:int):void { this._mapWidth=mapWidth; this._mapHeight=mapHeight; this._tilePixelWidth=tilePixelWidth; this._tilePixelHeight=tilePixelHeight; var row:int=this._mapHeight/this._tilePixelHeight; var col:int = this._mapWidth / this._tilePixelWidth; this._wHalfTile=int(this._tilePixelWidth/2); this._hHalfTile=int(this._tilePixelHeight/2); var grid:Shape = new Shape(); this.addChild(grid); grid.graphics.beginFill(0xcc6600,.5); grid.graphics.drawRect(0,0,mapWidth,mapHeight); grid.graphics.endFill(); grid.graphics.lineStyle(1, 0x000000, 1); var dblMapWidth:int=col*2+1; var dblMapHeight:int = row * 2 + 1; for (var i:int=1; i<dblMapWidth; i=i+2) { grid.graphics.moveTo( i*this._wHalfTile, 0 ); if (dblMapHeight+i>=dblMapWidth) { grid.graphics.lineTo( dblMapWidth * this._wHalfTile, (dblMapWidth - i) * this._hHalfTile ); } else { grid.graphics.lineTo( (dblMapHeight+i)*this._wHalfTile, dblMapHeight*this._hHalfTile ); } grid.graphics.moveTo( i*this._wHalfTile, 0 ); if (i<=dblMapHeight) { grid.graphics.lineTo( 0, i*this._hHalfTile ); } else { trace((i-row-1),row); grid.graphics.lineTo( (i-row*2-1)*this._wHalfTile, dblMapHeight*this._hHalfTile ); } } for (var j:int=1; j<dblMapHeight; j=j+2) { grid.graphics.moveTo( 0, j*this._hHalfTile ); if (dblMapHeight-j>=dblMapWidth) { grid.graphics.lineTo( dblMapWidth*this._wHalfTile, (dblMapWidth+j)*this._hHalfTile ); } else { grid.graphics.lineTo( (dblMapHeight-j)*this._wHalfTile, dblMapHeight*this._hHalfTile ); } } for (var m:int=0; m<dblMapHeight; m=m+2) { grid.graphics.moveTo( dblMapWidth*this._wHalfTile, m*this._hHalfTile ); if (dblMapWidth-dblMapHeight+m<0) { grid.graphics.lineTo( 0, (dblMapWidth+m)*this._hHalfTile ); } else { grid.graphics.lineTo( (dblMapWidth-dblMapHeight+m)*this._wHalfTile, dblMapHeight*this._hHalfTile ); } }}?