Finding adjacent cells in an hex map – part 2

April 27, 2008 by Emanuele Feronato
Filed Under Flash, Game design • 3 Comments 

In the Finding adjacent cells in an hex map post I showed you how to find adjacent cells in horizontal hex maps.

Now it’s time to find adjacent cells in vertical hex maps.

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hexagon_width = 44;
hexagon_height = 38;
grid_x_size = 10;
grid_y_size = 12;
sector_width = hexagon_width/4*3;
sector_height = hexagon_height;
gradient = (hexagon_width/4)/(hexagon_height/2);
for (x=0; x<grid_x_size; x++) {
	for (y=0; y<grid_y_size; y++) {
		hexagon_x_position = hexagon_width*y/4*3;
		hexagon_y_position = hexagon_height*x+(y%2)*hexagon_height/2;
		hexagon_number = y+x*grid_y_size;
		hexagon_movieclip = attachMovie("hhexagon", "hhexagon_"+hexagon_number, hexagon_number, {_x:hexagon_x_position, _y:hexagon_y_position});
		hexagon_movieclip.gotoAndStop(1);
		hexagon_movieclip.txt.text = hexagon_number;
	}
}
onEnterFrame = function () {
	_root["hhexagon_"+hexagon_hover].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover+1)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover-1)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover+11)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover+12)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover+13)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover-11)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover-12)].gotoAndStop(1);
	_root["hhexagon_"+(hexagon_hover-13)].gotoAndStop(1);
	sector_x = Math.floor(_xmouse/sector_width);
	sector_y = Math.floor(_ymouse/sector_height);
	delta_sector_x = _xmouse%sector_width;
	delta_sector_y = _ymouse%sector_height;
	switch (sector_x%2) {
		case 1 :
			if (delta_sector_y>=hexagon_height/2) {
				if (delta_sector_x>(hexagon_width/2-delta_sector_y*gradient)) {
					real_x = sector_x;
					real_y = sector_y;
				}
				else {
					real_x = sector_x-1;
					real_y = sector_y;
				}
			}
			else {
				if (delta_sector_x<delta_sector_y*gradient) {
					real_x = sector_x-1;
					real_y = sector_y;
				}
				else {
					real_x = sector_x;
					real_y = sector_y-1;
				}
			}
			break;
		case 0 :
			real_x = sector_x;
			real_y = sector_y;
			if (delta_sector_x<((hexagon_width/4)-delta_sector_y*gradient)) {
				real_x = sector_x-1;
				real_y = sector_y-1;
			}
			if (delta_sector_x<((-hexagon_width/4)+delta_sector_y*gradient)) {
				real_x = sector_x-1;
				real_y = sector_y;
			}
			break;
	}
	if ((real_x>=0) and (real_x<grid_y_size) and (real_y>=0) and (real_y<grid_x_size)) {
		hexagon_hover = real_x+real_y*grid_y_size;
		_root["hhexagon_"+hexagon_hover].gotoAndStop(2);
		if(hexagon_hover%grid_y_size!=grid_y_size-1){
			_root["hhexagon_"+(hexagon_hover+1)].gotoAndStop(3);
		}
		if(hexagon_hover%grid_y_size!=0){
			_root["hhexagon_"+(hexagon_hover-1)].gotoAndStop(3);
		}
		if (hexagon_hover%2 == 0) {
			_root["hhexagon_"+(hexagon_hover-11)].gotoAndStop(3);
			if(hexagon_hover%grid_y_size!=0){
				_root["hhexagon_"+(hexagon_hover-13)].gotoAndStop(3);
			}
			_root["hhexagon_"+(hexagon_hover+12)].gotoAndStop(3);
			_root["hhexagon_"+(hexagon_hover-12)].gotoAndStop(3);
		}
		else {
			if(hexagon_hover%grid_y_size!=grid_y_size-1){
				_root["hhexagon_"+(hexagon_hover+13)].gotoAndStop(3);
			}
			_root["hhexagon_"+(hexagon_hover+11)].gotoAndStop(3);
			_root["hhexagon_"+(hexagon_hover+12)].gotoAndStop(3);
			_root["hhexagon_"+(hexagon_hover-12)].gotoAndStop(3);		
		}
	}
};

Here it is:

This is the last uncommented step, during next one we will discuss about the method used to determine adjacent cells.

Download and enjoy!!

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3 Responses to “Finding adjacent cells in an hex map – part 2”

  1. Nathan on April 28th, 2008 12:20 am

    First comment! This is really cool, your tutorials are awesome.

  2. JDog on April 28th, 2008 6:39 pm

    Second comment, Gratz ! looking great, what are you planning ?

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