источнике d3.js:
https://github.com/mbostock/d3/blob/master/src/geom/polygon.js#L49-L86
в строке 49 вы можете прочитать:
// The Sutherland-Hodgman clipping algorithm.
// Note: requires the clip polygon to be counterclockwise and convex.
d3_geom_polygonPrototype.clip = function(subject) {
...
}
Вы ОБЯЗАНЫ сделать полигоны контр-направленными вот так:
В вашем случае:
var vis = d3.select("body").append("svg").attr({
width: 1000,
height: 667
}),
// I deleted scales there to make the code smaller
arrayOfPolygons = [{
name: "polygon 1",
points: []
}, {
name: "polygon 2 ",
points: []
}];
// clockwise polygon
arrayOfPolygons[0].points = [
[5.5, 15.5],
[24.0, 15.5],
[20.5, 20],
[12.0, 45.5],
[4.0, 20]
];
// counterclockwise polygon
arrayOfPolygons[1].points = [
[4.5, 24.5],
[14.0, 24.5],
[18.5, 20],
[0.0, 20]
];
var p1 = d3.geom.polygon(arrayOfPolygons[0].points);
var p2 = d3.geom.polygon(arrayOfPolygons[1].points);
var p_x = p1.slice();// cloned polygon
p2.clip(p_x);// cloned polygon clipped
// the first polygon
vis.append("svg:polygon").attr({
points: p1,
stroke: "black",
fill: "none"
});
// the second polygon
vis.append("svg:polygon").attr({
points: p2,
stroke: "black",
fill: "none"
});
// clipped part
vis.append("svg:polygon").attr({
points: p_x,
stroke: "red",
fill: "yellow"
});
наконец результат:
DEMO: http://jsfiddle.net/335089x2/12/
Теперь вы можете добавить data()
функцию и весы.