Hello, polygon-offset / Fil

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Hello

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Jun 12, 2022

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Hello

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Hello, polygon-offset

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Offset = require('https://bundle.run/polygon-offset@0.3.1')

{

const context = DOM.context2d(width, 600);

context.clearRect(0, 0, width, 600);

context.scale(4.5, 4.5);

context.translate(16, 16);

const path = d3.geoPath().context(context);

context.beginPath();

path({

type: "Polygon",

coordinates: [...res.margined, ...res.padding]

});

context.fill();

context.beginPath();

path({

type: "Polygon",

coordinates: res.unknown

});

context.fillStyle = "#ddd";

context.fill();

context.beginPath();

path({

type: "Polygon",

coordinates: res.polyline

});

context.strokeStyle = "green";

context.stroke();

context.beginPath();

path({

type: "MultiPoint",

coordinates: res.points

});

context.fillStyle = "red";

context.fill();

return context.canvas;

}

res = {

var points = [[0, 0], [0, 100], [150, 100], [100, 0], [0, 0]];

var offset = new Offset().arcSegments(12);

var margined = offset.data(points).margin(1);

var padding = offset

.data(points)

.padding(10)

.map(p => p.reverse());

// decides from the sign of x: negative for padding

var unknown = offset.data(points).offset(-1);

// if you want to work with the polyline - margin only

var polyline = offset.data(points).offsetLine(12);

return { points, margined, padding, unknown, polyline };

}

d3 = require("d3-geo@1")

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