|
(function() { |
|
var global, hexProjection, hexTopology, mousedown, mousemove, mouseup, redraw; |
|
|
|
global = {}; |
|
|
|
window.main = function() { |
|
var height, radius, svg, width; |
|
width = 960; |
|
height = 500; |
|
radius = 20; |
|
global.mousing = 0; |
|
global.color = 0; |
|
global.hex_topology = hexTopology(radius, width, height); |
|
global.path_generator = d3.geo.path().projection(hexProjection(radius)); |
|
global.color_scale = d3.scale.category10(); |
|
svg = d3.select('body').append('svg').attr('width', width).attr('height', height); |
|
svg.append('g').attr('class', 'hexagon').selectAll('path').data(global.hex_topology.objects.hexagons.geometries).enter().append('path').attr('d', function(d) { |
|
return global.path_generator(topojson.feature(global.hex_topology, d)); |
|
}).on('mousedown', mousedown).on('mousemove', mousemove).on('mouseup', mouseup); |
|
svg.append('path').datum(topojson.mesh(global.hex_topology, global.hex_topology.objects.hexagons)).attr('class', 'mesh').attr('d', global.path_generator); |
|
return global.border = svg.append('path').attr('class', 'border').call(redraw); |
|
}; |
|
|
|
/* create the hex mesh TopoJSON |
|
*/ |
|
|
|
hexTopology = function(radius, width, height) { |
|
var arcs, dx, dy, geometries, i, j, m, n, q, x, y; |
|
dx = radius * 2 * Math.sin(Math.PI / 3); |
|
dy = radius * 1.5; |
|
m = Math.ceil((height + radius) / dy) + 1; |
|
n = Math.ceil(width / dx) + 1; |
|
geometries = []; |
|
arcs = []; |
|
for (j = -1; -1 <= m ? j <= m : j >= m; -1 <= m ? j++ : j--) { |
|
for (i = -1; -1 <= n ? i <= n : i >= n; -1 <= n ? i++ : i--) { |
|
y = j * 2; |
|
x = (i + (j & 1) / 2) * 2; |
|
arcs.push([[x, y - 1], [1, 1]], [[x + 1, y], [0, 1]], [[x + 1, y + 1], [-1, 1]]); |
|
} |
|
} |
|
q = 3; |
|
for (j = 0; 0 <= m ? j < m : j > m; 0 <= m ? j++ : j--) { |
|
for (i = 0; 0 <= n ? i < n : i > n; 0 <= n ? i++ : i--) { |
|
geometries.push({ |
|
type: 'Polygon', |
|
arcs: [[q, q + 1, q + 2, ~(q + (n + 2 - (j & 1)) * 3), ~(q - 2), ~(q - (n + 2 + (j & 1)) * 3 + 2)]] |
|
}); |
|
q += 3; |
|
} |
|
q += 6; |
|
} |
|
return { |
|
transform: { |
|
translate: [0, 0], |
|
scale: [1, 1] |
|
}, |
|
objects: { |
|
hexagons: { |
|
type: 'GeometryCollection', |
|
geometries: geometries |
|
} |
|
}, |
|
arcs: arcs |
|
}; |
|
}; |
|
|
|
/* define a custom projection to make hexagons appear regular |
|
*/ |
|
|
|
hexProjection = function(radius) { |
|
var dx, dy; |
|
dx = radius * 2 * Math.sin(Math.PI / 3); |
|
dy = radius * 1.5; |
|
return { |
|
stream: function(stream) { |
|
return { |
|
point: (function(x, y) { |
|
return stream.point(x * dx / 2, (y - (2 - (y & 1)) / 3) * dy / 2); |
|
}), |
|
lineStart: (function() { |
|
return stream.lineStart(); |
|
}), |
|
lineEnd: (function() { |
|
return stream.lineEnd(); |
|
}), |
|
polygonStart: (function() { |
|
return stream.polygonStart(); |
|
}), |
|
polygonEnd: (function() { |
|
return stream.polygonEnd(); |
|
}) |
|
}; |
|
} |
|
}; |
|
}; |
|
|
|
/* user interaction callbacks |
|
*/ |
|
|
|
mousemove = function(d) { |
|
if (global.mousing) { |
|
d3.select(this).style('fill', global.color_scale(d.fill = global.color)); |
|
return global.border.call(redraw); |
|
} |
|
}; |
|
|
|
mousedown = function(d) { |
|
global.mousing = d.fill ? -1 : +1; |
|
return mousemove.apply(this, arguments); |
|
}; |
|
|
|
mouseup = function() { |
|
mousemove.apply(this, arguments); |
|
global.mousing = 0; |
|
/* cycle through 6 colors |
|
*/ |
|
return global.color = (global.color + 1) % 6; |
|
}; |
|
|
|
/* redraw borders |
|
*/ |
|
|
|
redraw = function(border) { |
|
return border.attr('d', global.path_generator(topojson.mesh(global.hex_topology, global.hex_topology.objects.hexagons, function(a, b) { |
|
return a.fill !== b.fill; |
|
}))); |
|
}; |
|
|
|
}).call(this); |