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polygon.js-e
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polygon.js-e
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## Copyright (c) 2013, Empirical Modelling Group
## All rights reserved.
##
## See LICENSE.txt
${{
Polygon = function(vertices, fillcolour, outlinecolour, drawingOptions, centreY) {
this.vertices = vertices;
this.fillcolour = fillcolour;
this.outlinecolour = outlinecolour;
this.drawingOptions = drawingOptions;
this.centreY = centreY; //Used by RegularPolygon
this.name = edenUI.plugins.Canvas2D.initZoneFromDrawingOpts(drawingOptions, "Polygon");
this.obsName = root.currentObservableName();
}
}}$;
#! Creates a Polygon object for display on a canvas. You give a list of points and it will draw lines between them and then, optionally, fill the area inside. It will automatically join the last point to the first to close the shape. See [drawing options](@external CanvasExamples > drawingoptions) for more style options.
#
# ##Usage Example
# `Polygon(pointslist, "green", "black");`
# `Polygon([Point(10,10),Point(20,20),Point(10,20)]);`
#
# @param points List of coordinates in the form {x, y} from the top left corner of the canvas
# @param [fill_colour Colour of the polygon (fill) in HTML form
# @param [outline_colour]]
# @param [drawing_options] List of drawing options
#
# #canvas #polygon #drawingoptions #shape #area #triangle #octagon #hexagon #pentagon #poly #draw
func Polygon {
${{
var vertices = arguments[0];
if (vertices[0].x != vertices[vertices.length - 1].x || vertices[0].y != vertices[vertices.length - 1].y) {
vertices.push(vertices[0]);
}
var fillcolour, outlinecolour, drawingOptions;
var lastArg = arguments[arguments.length - 1];
var processUpTo;
if (lastArg !== undefined && (lastArg instanceof Object) && !Array.isArray(lastArg) && !(lastArg instanceof EdenUI.plugins.Canvas2D.FillStyle)) {
drawingOptions = lastArg;
processUpTo = arguments.length - 2;
} else {
processUpTo = arguments.length - 1;
}
if (processUpTo >= 1) {
fillcolour = arguments[1];
if (processUpTo == 2) {
outlinecolour = arguments[2];
}
}
if (outlinecolour === undefined) {
if (fillcolour === undefined) {
outlinecolour = "black";
}
}
return new Polygon(vertices, fillcolour, outlinecolour, drawingOptions);
}}$; };
${{
Polygon.prototype.draw = function (context, scale) {
if (this.drawingOptions !== undefined && this.drawingOptions.lineWidth % 2 == 1) {
context.translate(0.5 / scale, 0.5 / scale);
}
this.tracePath(context, scale);
if (this.fillcolour !== undefined) {
edenUI.plugins.Canvas2D.setFillStyle(context, this.fillcolour);
context.fill();
}
if (this.outlinecolour !== undefined) {
context.strokeStyle = this.outlinecolour;
context.stroke();
}
};
Polygon.prototype.tracePath = function (context, scale) {
context.beginPath();
if (scale < 0 && this.centreY !== undefined) {
var a = 2 * this.centreY;
context.moveTo(this.vertices[0].x, a - this.vertices[0].y);
for (var i = 1; i < this.vertices.length; i++) {
context.lineTo(this.vertices[i].x, a - this.vertices[i].y);
}
} else {
context.moveTo(this.vertices[0].x, this.vertices[0].y);
for (var i = 1; i < this.vertices.length; i++) {
context.lineTo(this.vertices[i].x, this.vertices[i].y);
}
}
context.closePath();
}
Polygon.prototype.isHit = function (context, scale, x, y) {
this.tracePath(context, scale);
return context.isPointInPath(x,y);
}
Polygon.prototype.toString = function() {
var s = "Polygon(" + Eden.edenCodeForValues(this.vertices, this.fillcolour, this.outlinecolour);
if (this.drawingOptions !== undefined) {
s = s + ", " + Eden.edenCodeForValue(this.drawingOptions);
}
s = s + ")";
return s;
};
Polygon.prototype.getEdenCode = Polygon.prototype.toString;
Polygon.prototype.imageMapArea = function () {
var s = "shape=\"poly\" coords=\"";
for (var i = 0; i < this.vertices.length; i++) {
var vertex = this.vertices[i];
s = s + vertex.x + "," + vertex.y + ",";
}
s = s.slice(0, -1);
s = s + "\"";
return s;
}
Polygon.prototype.centre = function () {
var centreX = 0, centreY = 0;
for (var i = 0; i < this.vertices.length; i++) {
centreX = centreX + this.vertices[i].x;
centreY = centreY + this.vertices[i].y;
}
centreX = centreX / this.vertices.length;
centreY = centreY / this.vertices.length;
return new Point(centreX, centreY);
}
}}$;