d3 scatterplot example using the Breakfast Cereal Dataset from http://idvbook.com and based on the scatterplot example at http://bl.ocks.org/mbostock/3887118
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Cereal Name | Manufacturer | Type | Calories | Protein (g) | Fat | Sodium | Dietary Fiber | Carbs | Sugars | Display Shelf | Potassium | Vitamins and Minerals | Serving Size Weight | Cups per Serving | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
100%_Bran | Nabisco | C | 70 | 4 | 1 | 130 | 10 | 5 | 6 | 3 | 280 | 25 | 1 | 0.33 | |
100%_Natural_Bran | Quaker Oats | C | 120 | 3 | 5 | 15 | 2 | 8 | 8 | 3 | 135 | 0 | 1 | -1 | |
All-Bran | Kelloggs | C | 70 | 4 | 1 | 260 | 9 | 7 | 5 | 3 | 320 | 25 | 1 | 0.33 | |
All-Bran_with_Extra_Fiber | Kelloggs | C | 50 | 4 | 0 | 140 | 14 | 8 | 0 | 3 | 330 | 25 | 1 | 0.5 | |
Almond_Delight | Ralston Purina | C | 110 | 2 | 2 | 200 | 1 | 14 | 8 | 3 | -1 | 25 | 1 | 0.75 | |
Apple_Cinnamon_Cheerios | General Mills | C | 110 | 2 | 2 | 180 | 1.5 | 10.5 | 10 | 1 | 70 | 25 | 1 | 0.75 | |
Apple_Jacks | Kelloggs | C | 110 | 2 | 0 | 125 | 1 | 11 | 14 | 2 | 30 | 25 | 1 | 1 | |
Basic_4 | General Mills | C | 130 | 3 | 2 | 210 | 2 | 18 | 8 | 3 | 100 | 25 | 1.33 | 0.75 | |
Bran_Chex | Ralston Purina | C | 90 | 2 | 1 | 200 | 4 | 15 | 6 | 1 | 125 | 25 | 1 | 0.67 | |
Bran_Flakes | Post | C | 90 | 3 | 0 | 210 | 5 | 13 | 5 | 3 | 190 | 25 | 1 | 0.67 | |
Cap'n'Crunch | Quaker Oats | C | 120 | 1 | 2 | 220 | 0 | 12 | 12 | 2 | 35 | 25 | 1 | 0.75 | |
Cheerios | General Mills | C | 110 | 6 | 2 | 290 | 2 | 17 | 1 | 1 | 105 | 25 | 1 | 1.25 | |
Cinnamon_Toast_Crunch | General Mills | C | 120 | 1 | 3 | 210 | 0 | 13 | 9 | 2 | 45 | 25 | 1 | 0.75 | |
Clusters | General Mills | C | 110 | 3 | 2 | 140 | 2 | 13 | 7 | 3 | 105 | 25 | 1 | 0.5 | |
Cocoa_Puffs | General Mills | C | 110 | 1 | 1 | 180 | 0 | 12 | 13 | 2 | 55 | 25 | 1 | 1 | |
Corn_Chex | Ralston Purina | C | 110 | 2 | 0 | 280 | 0 | 22 | 3 | 1 | 25 | 25 | 1 | 1 | |
Corn_Flakes | Kelloggs | C | 100 | 2 | 0 | 290 | 1 | 21 | 2 | 1 | 35 | 25 | 1 | 1 | |
Corn_Pops | Kelloggs | C | 110 | 1 | 0 | 90 | 1 | 13 | 12 | 2 | 20 | 25 | 1 | 1 | |
Count_Chocula | General Mills | C | 110 | 1 | 1 | 180 | 0 | 12 | 13 | 2 | 65 | 25 | 1 | 1 | |
Cracklin'_Oat_Bran | Kelloggs | C | 110 | 3 | 3 | 140 | 4 | 10 | 7 | 3 | 160 | 25 | 1 | 0.5 | |
Cream_of_Wheat_(Quick) | Nabisco | H | 100 | 3 | 0 | 80 | 1 | 21 | 0 | 2 | -1 | 0 | 1 | 1 | |
Crispix | Kelloggs | C | 110 | 2 | 0 | 220 | 1 | 21 | 3 | 3 | 30 | 25 | 1 | 1 | |
Crispy_Wheat_&_Raisins | General Mills | C | 100 | 2 | 1 | 140 | 2 | 11 | 10 | 3 | 120 | 25 | 1 | 0.75 | |
Double_Chex | Ralston Purina | C | 100 | 2 | 0 | 190 | 1 | 18 | 5 | 3 | 80 | 25 | 1 | 0.75 | |
Froot_Loops | Kelloggs | C | 110 | 2 | 1 | 125 | 1 | 11 | 13 | 2 | 30 | 25 | 1 | 1 | |
Frosted_Flakes | Kelloggs | C | 110 | 1 | 0 | 200 | 1 | 14 | 11 | 1 | 25 | 25 | 1 | 0.75 | |
Frosted_Mini-Wheats | Kelloggs | C | 100 | 3 | 0 | 0 | 3 | 14 | 7 | 2 | 100 | 25 | 1 | 0.8 | |
Fruitful_Bran | Kelloggs | C | 120 | 3 | 0 | 240 | 5 | 14 | 12 | 3 | 190 | 25 | 1.33 | 0.67 | |
Fruity_Pebbles | Post | C | 110 | 1 | 1 | 135 | 0 | 13 | 12 | 2 | 25 | 25 | 1 | 0.75 | |
Golden_Crisp | Post | C | 100 | 2 | 0 | 45 | 0 | 11 | 15 | 1 | 40 | 25 | 1 | 0.88 | |
Golden_Grahams | General Mills | C | 110 | 1 | 1 | 280 | 0 | 15 | 9 | 2 | 45 | 25 | 1 | 0.75 | |
Grape_Nuts_Flakes | Post | C | 100 | 3 | 1 | 140 | 3 | 15 | 5 | 3 | 85 | 25 | 1 | 0.88 | |
Grape-Nuts | Post | C | 110 | 3 | 0 | 170 | 3 | 17 | 3 | 3 | 90 | 25 | 1 | 0.25 | |
Great_Grains_Pecan | Post | C | 120 | 3 | 3 | 75 | 3 | 13 | 4 | 3 | 100 | 25 | 1 | 0.33 | |
Honey_Graham_Ohs | Quaker Oats | C | 120 | 1 | 2 | 220 | 1 | 12 | 11 | 2 | 45 | 25 | 1 | 1 | |
Honey_Nut_Cheerios | General Mills | C | 110 | 3 | 1 | 250 | 1.5 | 11.5 | 10 | 1 | 90 | 25 | 1 | 0.75 | |
Honey-comb | Post | C | 110 | 1 | 0 | 180 | 0 | 14 | 11 | 1 | 35 | 25 | 1 | 1.33 | |
Just_Right_Crunchy__Nuggets | Kelloggs | C | 110 | 2 | 1 | 170 | 1 | 17 | 6 | 3 | 60 | 100 | 1 | -1 | |
Just_Right_Fruit_&_Nut | Kelloggs | C | 140 | 3 | 1 | 170 | 2 | 20 | 9 | 3 | 95 | 100 | 1.3 | 0.75 | |
Kix | General Mills | C | 110 | 2 | 1 | 260 | 0 | 21 | 3 | 2 | 40 | 25 | 1 | 1.5 | |
Life | Quaker Oats | C | 100 | 4 | 2 | 150 | 2 | 12 | 6 | 2 | 95 | 25 | 1 | 0.67 | |
Lucky_Charms | General Mills | C | 110 | 2 | 1 | 180 | 0 | 12 | 12 | 2 | 55 | 25 | 1 | 1 | |
Maypo | American Home Food Products | H | 100 | 4 | 1 | 0 | 0 | 16 | 3 | 2 | 95 | 25 | 1 | -1 | |
Mueslix_Crispy_Blend | Kelloggs | C | 160 | 3 | 2 | 150 | 3 | 17 | 13 | 3 | 160 | 25 | 1.5 | 0.67 | |
Multi-Grain_Cheerios | General Mills | C | 100 | 2 | 1 | 220 | 2 | 15 | 6 | 1 | 90 | 25 | 1 | 1 | |
Nut&Honey_Crunch | Kelloggs | C | 120 | 2 | 1 | 190 | 0 | 15 | 9 | 2 | 40 | 25 | 1 | 0.67 | |
Nutri-Grain_Almond-Raisin | Kelloggs | C | 140 | 3 | 2 | 220 | 3 | 21 | 7 | 3 | 130 | 25 | 1.33 | 0.67 | |
Nutri-grain_Wheat | Kelloggs | C | 90 | 3 | 0 | 170 | 3 | 18 | 2 | 3 | 90 | 25 | 1 | -1 | |
Oatmeal_Raisin_Crisp | General Mills | C | 130 | 3 | 2 | 170 | 1.5 | 13.5 | 10 | 3 | 120 | 25 | 1.25 | 0.5 | |
Post_Nat._Raisin_Bran | Post | C | 120 | 3 | 1 | 200 | 6 | 11 | 14 | 3 | 260 | 25 | 1.33 | 0.67 | |
Product_19 | Kelloggs | C | 100 | 3 | 0 | 320 | 1 | 20 | 3 | 3 | 45 | 100 | 1 | 1 | |
Puffed_Rice | Quaker Oats | C | 50 | 1 | 0 | 0 | 0 | 13 | 0 | 3 | 15 | 0 | 0.5 | 1 | |
Puffed_Wheat | Quaker Oats | C | 50 | 2 | 0 | 0 | 1 | 10 | 0 | 3 | 50 | 0 | 0.5 | -1 | |
Quaker_Oat_Squares | Quaker Oats | C | 100 | 4 | 1 | 135 | 2 | 14 | 6 | 3 | 110 | 25 | 1 | 0.5 | |
Quaker_Oatmeal | Quaker Oats | H | 100 | 5 | 2 | 0 | 2.7 | -1 | -1 | 1 | 110 | 0 | 1 | 0.67 | |
Raisin_Bran | Kelloggs | C | 120 | 3 | 1 | 210 | 5 | 14 | 12 | 2 | 240 | 25 | 1.33 | 0.75 | |
Raisin_Nut_Bran | General Mills | C | 100 | 3 | 2 | 140 | 2.5 | 10.5 | 8 | 3 | 140 | 25 | 1 | 0.5 | |
Raisin_Squares | Kelloggs | C | 90 | 2 | 0 | 0 | 2 | 15 | 6 | 3 | 110 | 25 | 1 | 0.5 | |
Rice_Chex | Ralston Purina | C | 110 | 1 | 0 | 240 | 0 | 23 | 2 | 1 | 30 | 25 | 1 | 1.13 | |
Rice_Krispies | Kelloggs | C | 110 | 2 | 0 | 290 | 0 | 22 | 3 | 1 | 35 | 25 | 1 | 1 | |
Shredded_Wheat | Nabisco | C | 80 | 2 | 0 | 0 | 3 | 16 | 0 | 1 | 95 | 0 | 0.83 | -1 | |
Shredded_Wheat_'n'Bran | Nabisco | C | 90 | 3 | 0 | 0 | 4 | 19 | 0 | 1 | 140 | 0 | 1 | 0.67 | |
Shredded_Wheat_spoon_size | Nabisco | C | 90 | 3 | 0 | 0 | 3 | 20 | 0 | 1 | 120 | 0 | 1 | 0.67 | |
Smacks | Kelloggs | C | 110 | 2 | 1 | 70 | 1 | 9 | 15 | 2 | 40 | 25 | 1 | 0.75 | |
Special_K | Kelloggs | C | 110 | 6 | 0 | 230 | 1 | 16 | 3 | 1 | 55 | 25 | 1 | 1 | |
Strawberry_Fruit_Wheats | Nabisco | C | 90 | 2 | 0 | 15 | 3 | 15 | 5 | 2 | 90 | 25 | 1 | -1 | |
Total_Corn_Flakes | General Mills | C | 110 | 2 | 1 | 200 | 0 | 21 | 3 | 3 | 35 | 100 | 1 | 1 | |
Total_Raisin_Bran | General Mills | C | 140 | 3 | 1 | 190 | 4 | 15 | 14 | 3 | 230 | 100 | 1.5 | 1 | |
Total_Whole_Grain | General Mills | C | 100 | 3 | 1 | 200 | 3 | 16 | 3 | 3 | 110 | 100 | 1 | 1 | |
Triples | General Mills | C | 110 | 2 | 1 | 250 | 0 | 21 | 3 | 3 | 60 | 25 | 1 | 0.75 | |
Trix | General Mills | C | 110 | 1 | 1 | 140 | 0 | 13 | 12 | 2 | 25 | 25 | 1 | 1 | |
Wheat_Chex | Ralston Purina | C | 100 | 3 | 1 | 230 | 3 | 17 | 3 | 1 | 115 | 25 | 1 | 0.67 | |
Wheaties | General Mills | C | 100 | 3 | 1 | 200 | 3 | 17 | 3 | 1 | 110 | 25 | 1 | 1 | |
Wheaties_Honey_Gold | General Mills | C | 110 | 2 | 1 | 200 | 1 | 16 | 8 | 1 | 60 | 25 | 1 | 0.75 |
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<!DOCTYPE html> | |
<html> | |
<meta charset="utf-8"> | |
<!-- Example based on http://bl.ocks.org/mbostock/3887118 --> | |
<!-- Tooltip example from http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html --> | |
<style> | |
.brush .extent { | |
stroke: #000; | |
stroke-width: 1.5px; | |
fill: #000; | |
fill-opacity: 0.3; | |
} | |
body { | |
font: 11px sans-serif; | |
} | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
.dot { | |
stroke: #000; | |
} | |
.tooltip { | |
position: absolute; | |
width: 200px; | |
height: 28px; | |
pointer-events: none; | |
} | |
.dot.selected { | |
fill: red; | |
stroke: darkred; | |
stroke-width: 1; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script type="text/javascript" src="polybrush.js"></script> | |
<script> | |
var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
/* | |
* value accessor - returns the value to encode for a given data object. | |
* scale - maps value to a visual display encoding, such as a pixel position. | |
* map function - maps from data value to display value | |
* axis - sets up axis | |
*/ | |
// setup x | |
var xValue = function(d) { return d.Calories;}, // data -> value | |
xScale = d3.scale.linear().range([0, width]), // value -> display | |
xMap = function(d) { return xScale(xValue(d));}, // data -> display | |
xAxis = d3.svg.axis().scale(xScale).orient("bottom"); | |
// setup y | |
var yValue = function(d) { return d["Protein (g)"];}, // data -> value | |
yScale = d3.scale.linear().range([height, 0]), // value -> display | |
yMap = function(d) { return yScale(yValue(d));}, // data -> display | |
yAxis = d3.svg.axis().scale(yScale).orient("left"); | |
// setup fill color | |
var cValue = function(d) { return d.Manufacturer;}, | |
color = d3.scale.category10(); | |
// add the graph canvas to the body of the webpage | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.left + margin.right) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
// add the tooltip area to the webpage | |
var tooltip = d3.select("body").append("div") | |
.attr("class", "tooltip") | |
.style("opacity", 0); | |
// load data | |
d3.csv("cereal.csv", function(error, data) { | |
// change string (from CSV) into number format | |
data.forEach(function(d) { | |
d.Calories = +d.Calories; | |
d["Protein (g)"] = +d["Protein (g)"]; | |
// console.log(d); | |
}); | |
// don't want dots overlapping axis, so add in buffer to data domain | |
xScale.domain([d3.min(data, xValue)-1, d3.max(data, xValue)+1]); | |
yScale.domain([d3.min(data, yValue)-1, d3.max(data, yValue)+1]); | |
// x-axis | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0," + height + ")") | |
.call(xAxis) | |
.append("text") | |
.attr("class", "label") | |
.attr("x", width) | |
.attr("y", -6) | |
.style("text-anchor", "end") | |
.text("Calories"); | |
// y-axis | |
svg.append("g") | |
.attr("class", "y axis") | |
.call(yAxis) | |
.append("text") | |
.attr("class", "label") | |
.attr("transform", "rotate(-90)") | |
.attr("y", 6) | |
.attr("dy", ".71em") | |
.style("text-anchor", "end") | |
.text("Protein (g)"); | |
// draw dots | |
svg.selectAll(".dot") | |
.data(data) | |
.enter().append("circle") | |
.attr("class", "dot") | |
.attr("r", 3.5) | |
.attr("cx", xMap) | |
.attr("cy", yMap) | |
.attr("id", function(d, i) { return "point-"+i; }) | |
.style("fill", function(d) { return color(cValue(d));}) | |
.on("mouseover", function(d) { | |
tooltip.transition() | |
.duration(200) | |
.style("opacity", .9); | |
tooltip.html(d["Cereal Name"] + "<br/> (" + xValue(d) | |
+ ", " + yValue(d) + ")") | |
.style("left", (d3.event.pageX + 5) + "px") | |
.style("top", (d3.event.pageY - 28) + "px"); | |
}) | |
.on("mouseout", function(d) { | |
tooltip.transition() | |
.duration(500) | |
.style("opacity", 0); | |
}); | |
// draw legend | |
var legend = svg.selectAll(".legend") | |
.data(color.domain()) | |
.enter().append("g") | |
.attr("class", "legend") | |
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; }); | |
// draw legend colored rectangles | |
legend.append("rect") | |
.attr("x", width - 18) | |
.attr("width", 18) | |
.attr("height", 18) | |
.style("fill", color); | |
// draw legend text | |
legend.append("text") | |
.attr("x", width - 24) | |
.attr("y", 9) | |
.attr("dy", ".35em") | |
.style("text-anchor", "end") | |
.text(function(d) { return d;}) | |
}); | |
var w = width, | |
h = height; | |
var brush = d3.svg.polybrush() | |
.x(d3.scale.linear().range([0, w])) | |
.y(d3.scale.linear().range([0, h])) | |
.on("brushstart", function() { | |
svg.selectAll(".selected").classed("selected", false); | |
}) | |
.on("brush", function() { | |
// set the 'selected' class for the circle | |
svg.selectAll(".dot").classed("selected", function(d) { | |
//get the associated circle | |
var id = d3.select(this).attr("id"); | |
var i = id.substr(id.indexOf("-")+1, id.length); | |
var vornoi = d3.select("#point-"+i); | |
var y = d["Protein (g)"]; | |
var x = d["Calories"]; | |
// set the 'selected' class for the path | |
if (brush.isWithinExtent(x, y)) { | |
console.log(d); | |
vornoi.classed("selected", true); | |
return true; | |
} else { | |
vornoi.classed("selected", false); | |
return false; | |
} | |
}); | |
}); | |
svg.append("svg:g") | |
.attr("class", "brush") | |
.call(brush); | |
</script> | |
</body> | |
</html> |
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(function(d3) { | |
d3.svg.polybrush = function() { | |
var dispatch = d3.dispatch("brushstart", "brush", "brushend"), | |
x = null, | |
y = null, | |
extent = [], | |
firstClick = true, | |
firstTime = true, | |
wasDragged = false, | |
origin = null, | |
line = d3.svg.line() | |
.x(function(d) { | |
return d[0]; | |
}) | |
.y(function(d) { | |
return d[1]; | |
}); | |
var brush = function(g) { | |
g.each(function() { | |
var bg, e, fg; | |
g = d3.select(this); | |
bg = g.selectAll(".background").data([0]); | |
fg = g.selectAll(".extent").data([extent]); | |
g.style("pointer-events", "all").on("click.brush", addAnchor); | |
bg.enter().append("rect").attr("class", "background").style("visibility", "hidden").style("cursor", "crosshair"); | |
fg.enter().append("path").attr("class", "extent").style("cursor", "move"); | |
if (x) { | |
e = scaleExtent(x.range()); | |
bg.attr("x", e[0]).attr("width", e[1] - e[0]); | |
} | |
if (y) { | |
e = scaleExtent(y.range()); | |
bg.attr("y", e[0]).attr("height", e[1] - e[0]); | |
} | |
}); | |
}; | |
var drawPath = function() { | |
return d3.selectAll("g path").attr("d", function(d) { | |
return line(d) + "Z"; | |
}); | |
}; | |
var scaleExtent = function(domain) { | |
var start, stop; | |
start = domain[0]; | |
stop = domain[domain.length - 1]; | |
if (start < stop) { | |
return [start, stop]; | |
} else { | |
return [stop, start]; | |
} | |
}; | |
var withinBounds = function(point) { | |
var rangeX, rangeY, _x, _y; | |
rangeX = scaleExtent(x.range()); | |
rangeY = scaleExtent(y.range()); | |
_x = Math.max(rangeX[0], Math.min(rangeX[1], point[0])); | |
_y = Math.max(rangeY[0], Math.min(rangeY[1], point[1])); | |
return point[0] === _x && point[1] === _y; | |
}; | |
var moveAnchor = function(target) { | |
var moved, point; | |
point = d3.mouse(target); | |
if (firstTime) { | |
extent.push(point); | |
firstTime = false; | |
} else { | |
if (withinBounds(point)) { | |
extent.splice(extent.length - 1, 1, point); | |
} | |
drawPath(); | |
dispatch.brush(); | |
} | |
}; | |
var closePath = function() { | |
var w; | |
w = d3.select(window); | |
w.on("dblclick.brush", null).on("mousemove.brush", null); | |
firstClick = true; | |
if (extent.length === 2 && extent[0][0] === extent[1][0] && extent[0][1] === extent[1][1]) { | |
extent.splice(0, extent.length); | |
} | |
d3.select(".extent").on("mousedown.brush", moveExtent); | |
return dispatch.brushend(); | |
}; | |
var addAnchor = function() { | |
var g, w, | |
_this = this; | |
g = d3.select(this); | |
w = d3.select(window); | |
firstTime = true; | |
if (wasDragged) { | |
wasDragged = false; | |
return; | |
} | |
if (firstClick) { | |
extent.splice(0, extent.length); | |
firstClick = false; | |
d3.select(".extent").on("mousedown.brush", null); | |
w.on("mousemove.brush", function() { | |
return moveAnchor(_this); | |
}).on("dblclick.brush", closePath); | |
dispatch.brushstart(); | |
} | |
if (extent.length > 1) { | |
extent.pop(); | |
} | |
extent.push(d3.mouse(this)); | |
return drawPath(); | |
}; | |
var dragExtent = function(target) { | |
var checkBounds, fail, p, point, scaleX, scaleY, updateExtentPoint, _i, _j, _len, _len1; | |
point = d3.mouse(target); | |
scaleX = point[0] - origin[0]; | |
scaleY = point[1] - origin[1]; | |
fail = false; | |
origin = point; | |
updateExtentPoint = function(p) { | |
p[0] += scaleX; | |
p[1] += scaleY; | |
}; | |
for (_i = 0, _len = extent.length; _i < _len; _i++) { | |
p = extent[_i]; | |
updateExtentPoint(p); | |
} | |
checkBounds = function(p) { | |
if (!withinBounds(p)) { | |
fail = true; | |
} | |
return fail; | |
}; | |
for (_j = 0, _len1 = extent.length; _j < _len1; _j++) { | |
p = extent[_j]; | |
checkBounds(p); | |
} | |
if (fail) { | |
return; | |
} | |
drawPath(); | |
return dispatch.brush({ | |
mode: "move" | |
}); | |
}; | |
var dragStop = function() { | |
var w; | |
w = d3.select(window); | |
w.on("mousemove.brush", null).on("mouseup.brush", null); | |
wasDragged = true; | |
return dispatch.brushend(); | |
}; | |
var moveExtent = function() { | |
var _this = this; | |
d3.event.stopPropagation(); | |
d3.event.preventDefault(); | |
if (firstClick && !brush.empty()) { | |
d3.select(window).on("mousemove.brush", function() { | |
return dragExtent(_this); | |
}).on("mouseup.brush", dragStop); | |
origin = d3.mouse(this); | |
} | |
}; | |
brush.isWithinExtent = function(x, y) { | |
var i, j, len, p1, p2, ret, _i, _len; | |
len = extent.length; | |
j = len - 1; | |
ret = false; | |
for (i = _i = 0, _len = extent.length; _i < _len; i = ++_i) { | |
p1 = extent[i]; | |
p2 = extent[j]; | |
if ((p1[1] > y) !== (p2[1] > y) && x < (p2[0] - p1[0]) * (y - p1[1]) / (p2[1] - p1[1]) + p1[0]) { | |
ret = !ret; | |
} | |
j = i; | |
} | |
return ret; | |
}; | |
brush.x = function(z) { | |
if (!arguments.length) { | |
return x; | |
} | |
x = z; | |
return brush; | |
}; | |
brush.y = function(z) { | |
if (!arguments.length) { | |
return y; | |
} | |
y = z; | |
return brush; | |
}; | |
brush.extent = function(z) { | |
if (!arguments.length) { | |
return extent; | |
} | |
extent = z; | |
return brush; | |
}; | |
brush.clear = function() { | |
extent.splice(0, extent.length); | |
return brush; | |
}; | |
brush.empty = function() { | |
return extent.length === 0; | |
}; | |
d3.rebind(brush, dispatch, "on"); | |
return brush; | |
}; | |
})(d3); |
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