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/**
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* @module ol/style/RegularShape
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*/
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import ImageState from '../ImageState.js';
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import ImageStyle from './Image.js';
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import {asArray} from '../color.js';
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import {asColorLike} from '../colorlike.js';
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import {createCanvasContext2D} from '../dom.js';
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import {
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defaultFillStyle,
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defaultLineJoin,
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defaultLineWidth,
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defaultMiterLimit,
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defaultStrokeStyle,
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} from '../render/canvas.js';
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/**
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* Specify radius for regular polygons, or radius1 and radius2 for stars.
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* @typedef {Object} Options
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* @property {import("./Fill.js").default} [fill] Fill style.
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* @property {number} points Number of points for stars and regular polygons. In case of a polygon, the number of points
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* is the number of sides.
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* @property {number} [radius] Radius of a regular polygon.
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* @property {number} [radius1] First radius of a star. Ignored if radius is set.
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* @property {number} [radius2] Second radius of a star.
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* @property {number} [angle=0] Shape's angle in radians. A value of 0 will have one of the shape's points facing up.
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* @property {Array<number>} [displacement=[0, 0]] Displacement of the shape in pixels.
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* Positive values will shift the shape right and up.
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* @property {import("./Stroke.js").default} [stroke] Stroke style.
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* @property {number} [rotation=0] Rotation in radians (positive rotation clockwise).
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* @property {boolean} [rotateWithView=false] Whether to rotate the shape with the view.
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* @property {number|import("../size.js").Size} [scale=1] Scale. Unless two dimensional scaling is required a better
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* result may be obtained with appropriate settings for `radius`, `radius1` and `radius2`.
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* @property {"declutter"|"obstacle"|"none"|undefined} [declutterMode] Declutter mode.
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*/
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/**
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* @typedef {Object} RenderOptions
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* @property {import("../colorlike.js").ColorLike} [strokeStyle] StrokeStyle.
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* @property {number} strokeWidth StrokeWidth.
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* @property {number} size Size.
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* @property {Array<number>|null} lineDash LineDash.
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* @property {number} lineDashOffset LineDashOffset.
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* @property {CanvasLineJoin} lineJoin LineJoin.
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* @property {number} miterLimit MiterLimit.
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*/
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/**
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* @classdesc
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* Set regular shape style for vector features. The resulting shape will be
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* a regular polygon when `radius` is provided, or a star when `radius1` and
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* `radius2` are provided.
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* @api
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*/
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class RegularShape extends ImageStyle {
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/**
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* @param {Options} options Options.
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*/
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constructor(options) {
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/**
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* @type {boolean}
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*/
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const rotateWithView =
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options.rotateWithView !== undefined ? options.rotateWithView : false;
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super({
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opacity: 1,
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rotateWithView: rotateWithView,
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rotation: options.rotation !== undefined ? options.rotation : 0,
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scale: options.scale !== undefined ? options.scale : 1,
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displacement:
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options.displacement !== undefined ? options.displacement : [0, 0],
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declutterMode: options.declutterMode,
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});
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/**
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* @private
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* @type {Object<number, HTMLCanvasElement>}
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*/
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this.canvas_ = undefined;
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/**
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.hitDetectionCanvas_ = null;
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/**
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* @private
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* @type {import("./Fill.js").default}
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*/
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this.fill_ = options.fill !== undefined ? options.fill : null;
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/**
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* @private
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* @type {Array<number>}
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*/
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this.origin_ = [0, 0];
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/**
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* @private
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* @type {number}
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*/
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this.points_ = options.points;
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/**
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* @protected
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* @type {number}
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*/
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this.radius_ =
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options.radius !== undefined ? options.radius : options.radius1;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.radius2_ = options.radius2;
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/**
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* @private
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* @type {number}
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*/
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this.angle_ = options.angle !== undefined ? options.angle : 0;
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/**
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* @private
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* @type {import("./Stroke.js").default}
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*/
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this.stroke_ = options.stroke !== undefined ? options.stroke : null;
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/**
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* @private
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* @type {import("../size.js").Size}
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*/
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this.size_ = null;
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/**
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* @private
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* @type {RenderOptions}
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*/
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this.renderOptions_ = null;
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this.render();
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}
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/**
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* Clones the style.
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* @return {RegularShape} The cloned style.
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* @api
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*/
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clone() {
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const scale = this.getScale();
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const style = new RegularShape({
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fill: this.getFill() ? this.getFill().clone() : undefined,
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points: this.getPoints(),
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radius: this.getRadius(),
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radius2: this.getRadius2(),
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angle: this.getAngle(),
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stroke: this.getStroke() ? this.getStroke().clone() : undefined,
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rotation: this.getRotation(),
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rotateWithView: this.getRotateWithView(),
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scale: Array.isArray(scale) ? scale.slice() : scale,
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displacement: this.getDisplacement().slice(),
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declutterMode: this.getDeclutterMode(),
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});
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style.setOpacity(this.getOpacity());
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return style;
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}
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/**
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* Get the anchor point in pixels. The anchor determines the center point for the
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* symbolizer.
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* @return {Array<number>} Anchor.
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* @api
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*/
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getAnchor() {
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const size = this.size_;
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if (!size) {
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return null;
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}
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const displacement = this.getDisplacement();
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const scale = this.getScaleArray();
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// anchor is scaled by renderer but displacement should not be scaled
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// so divide by scale here
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return [
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size[0] / 2 - displacement[0] / scale[0],
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size[1] / 2 + displacement[1] / scale[1],
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];
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}
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/**
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* Get the angle used in generating the shape.
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* @return {number} Shape's rotation in radians.
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* @api
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*/
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getAngle() {
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return this.angle_;
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}
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/**
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* Get the fill style for the shape.
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* @return {import("./Fill.js").default} Fill style.
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* @api
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*/
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getFill() {
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return this.fill_;
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}
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/**
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* Set the fill style.
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* @param {import("./Fill.js").default} fill Fill style.
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* @api
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*/
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setFill(fill) {
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this.fill_ = fill;
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this.render();
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}
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/**
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* @return {HTMLCanvasElement} Image element.
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*/
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getHitDetectionImage() {
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if (!this.hitDetectionCanvas_) {
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this.createHitDetectionCanvas_(this.renderOptions_);
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}
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return this.hitDetectionCanvas_;
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}
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/**
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* Get the image icon.
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* @param {number} pixelRatio Pixel ratio.
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* @return {HTMLCanvasElement} Image or Canvas element.
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* @api
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*/
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getImage(pixelRatio) {
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let image = this.canvas_[pixelRatio];
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if (!image) {
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const renderOptions = this.renderOptions_;
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const context = createCanvasContext2D(
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renderOptions.size * pixelRatio,
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renderOptions.size * pixelRatio
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);
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this.draw_(renderOptions, context, pixelRatio);
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image = context.canvas;
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this.canvas_[pixelRatio] = image;
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}
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return image;
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}
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/**
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* Get the image pixel ratio.
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* @param {number} pixelRatio Pixel ratio.
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* @return {number} Pixel ratio.
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*/
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getPixelRatio(pixelRatio) {
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return pixelRatio;
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}
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/**
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* @return {import("../size.js").Size} Image size.
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*/
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getImageSize() {
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return this.size_;
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}
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/**
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* @return {import("../ImageState.js").default} Image state.
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*/
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getImageState() {
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return ImageState.LOADED;
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}
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/**
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* Get the origin of the symbolizer.
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* @return {Array<number>} Origin.
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* @api
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*/
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getOrigin() {
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return this.origin_;
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}
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/**
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* Get the number of points for generating the shape.
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* @return {number} Number of points for stars and regular polygons.
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* @api
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*/
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getPoints() {
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return this.points_;
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}
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/**
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* Get the (primary) radius for the shape.
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* @return {number} Radius.
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* @api
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*/
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getRadius() {
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return this.radius_;
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}
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/**
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* Get the secondary radius for the shape.
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* @return {number|undefined} Radius2.
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* @api
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*/
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getRadius2() {
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return this.radius2_;
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}
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/**
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* Get the size of the symbolizer (in pixels).
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* @return {import("../size.js").Size} Size.
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* @api
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*/
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getSize() {
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return this.size_;
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}
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/**
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* Get the stroke style for the shape.
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* @return {import("./Stroke.js").default} Stroke style.
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* @api
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*/
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getStroke() {
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return this.stroke_;
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}
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/**
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* Set the stroke style.
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* @param {import("./Stroke.js").default} stroke Stroke style.
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* @api
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*/
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setStroke(stroke) {
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this.stroke_ = stroke;
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this.render();
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}
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/**
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* @param {function(import("../events/Event.js").default): void} listener Listener function.
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*/
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listenImageChange(listener) {}
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/**
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* Load not yet loaded URI.
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*/
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load() {}
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/**
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* @param {function(import("../events/Event.js").default): void} listener Listener function.
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*/
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unlistenImageChange(listener) {}
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/**
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* Calculate additional canvas size needed for the miter.
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* @param {string} lineJoin Line join
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* @param {number} strokeWidth Stroke width
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* @param {number} miterLimit Miter limit
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* @return {number} Additional canvas size needed
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* @private
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*/
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calculateLineJoinSize_(lineJoin, strokeWidth, miterLimit) {
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if (
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strokeWidth === 0 ||
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this.points_ === Infinity ||
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(lineJoin !== 'bevel' && lineJoin !== 'miter')
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) {
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return strokeWidth;
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}
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// m | ^
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// i | |\ .
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// t >| #\
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// e | |\ \ .
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// r \s\
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// | \t\ . .
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// \r\ . .
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// | \o\ . . . . .
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// e \k\ . . . .
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// | \e\ . . . . .
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// d \ \ . . . .
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// | _ _a_ _\# . . .
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// r1 / ` . .
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// | . .
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// b / . .
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// | . .
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// / r2 . .
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// | . .
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// / . .
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// |α . .
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// / . .
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// ° center
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let r1 = this.radius_;
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let r2 = this.radius2_ === undefined ? r1 : this.radius2_;
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if (r1 < r2) {
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const tmp = r1;
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r1 = r2;
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r2 = tmp;
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}
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const points =
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this.radius2_ === undefined ? this.points_ : this.points_ * 2;
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const alpha = (2 * Math.PI) / points;
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const a = r2 * Math.sin(alpha);
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const b = Math.sqrt(r2 * r2 - a * a);
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const d = r1 - b;
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const e = Math.sqrt(a * a + d * d);
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const miterRatio = e / a;
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if (lineJoin === 'miter' && miterRatio <= miterLimit) {
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return miterRatio * strokeWidth;
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}
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// Calculate the distnce from center to the stroke corner where
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// it was cut short because of the miter limit.
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// l
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// ----+---- <= distance from center to here is maxr
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// /####|k ##\
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// /#####^#####\
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// /#### /+\# s #\
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// /### h/+++\# t #\
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// /### t/+++++\# r #\
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// /### a/+++++++\# o #\
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// /### p/++ fill +\# k #\
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///#### /+++++^+++++\# e #\
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//#####/+++++/+\+++++\#####\
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const k = strokeWidth / 2 / miterRatio;
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const l = (strokeWidth / 2) * (d / e);
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const maxr = Math.sqrt((r1 + k) * (r1 + k) + l * l);
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const bevelAdd = maxr - r1;
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if (this.radius2_ === undefined || lineJoin === 'bevel') {
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return bevelAdd * 2;
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}
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// If outer miter is over the miter limit the inner miter may reach through the
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// center and be longer than the bevel, same calculation as above but swap r1 / r2.
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const aa = r1 * Math.sin(alpha);
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const bb = Math.sqrt(r1 * r1 - aa * aa);
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const dd = r2 - bb;
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const ee = Math.sqrt(aa * aa + dd * dd);
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const innerMiterRatio = ee / aa;
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if (innerMiterRatio <= miterLimit) {
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const innerLength = (innerMiterRatio * strokeWidth) / 2 - r2 - r1;
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return 2 * Math.max(bevelAdd, innerLength);
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}
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return bevelAdd * 2;
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}
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/**
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* @return {RenderOptions} The render options
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* @protected
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*/
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createRenderOptions() {
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let lineJoin = defaultLineJoin;
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let miterLimit = 0;
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let lineDash = null;
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let lineDashOffset = 0;
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let strokeStyle;
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let strokeWidth = 0;
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if (this.stroke_) {
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strokeStyle = this.stroke_.getColor();
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if (strokeStyle === null) {
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strokeStyle = defaultStrokeStyle;
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}
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strokeStyle = asColorLike(strokeStyle);
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strokeWidth = this.stroke_.getWidth();
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if (strokeWidth === undefined) {
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strokeWidth = defaultLineWidth;
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}
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lineDash = this.stroke_.getLineDash();
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lineDashOffset = this.stroke_.getLineDashOffset();
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lineJoin = this.stroke_.getLineJoin();
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if (lineJoin === undefined) {
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lineJoin = defaultLineJoin;
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}
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miterLimit = this.stroke_.getMiterLimit();
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if (miterLimit === undefined) {
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|
miterLimit = defaultMiterLimit;
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}
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}
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const add = this.calculateLineJoinSize_(lineJoin, strokeWidth, miterLimit);
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const maxRadius = Math.max(this.radius_, this.radius2_ || 0);
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const size = Math.ceil(2 * maxRadius + add);
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return {
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strokeStyle: strokeStyle,
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strokeWidth: strokeWidth,
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size: size,
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lineDash: lineDash,
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lineDashOffset: lineDashOffset,
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lineJoin: lineJoin,
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|
miterLimit: miterLimit,
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};
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|
}
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/**
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* @protected
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|
*/
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render() {
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|
this.renderOptions_ = this.createRenderOptions();
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|
const size = this.renderOptions_.size;
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|
this.canvas_ = {};
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|
this.size_ = [size, size];
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|
}
|
|
|
|
|
|
/**
|
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|
* @private
|
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|
* @param {RenderOptions} renderOptions Render options.
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|
* @param {CanvasRenderingContext2D} context The rendering context.
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|
* @param {number} pixelRatio The pixel ratio.
|
|
|
*/
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|
|
draw_(renderOptions, context, pixelRatio) {
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|
context.scale(pixelRatio, pixelRatio);
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|
|
// set origin to canvas center
|
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|
context.translate(renderOptions.size / 2, renderOptions.size / 2);
|
|
|
|
|
|
this.createPath_(context);
|
|
|
|
|
|
if (this.fill_) {
|
|
|
let color = this.fill_.getColor();
|
|
|
if (color === null) {
|
|
|
color = defaultFillStyle;
|
|
|
}
|
|
|
context.fillStyle = asColorLike(color);
|
|
|
context.fill();
|
|
|
}
|
|
|
if (this.stroke_) {
|
|
|
context.strokeStyle = renderOptions.strokeStyle;
|
|
|
context.lineWidth = renderOptions.strokeWidth;
|
|
|
if (renderOptions.lineDash) {
|
|
|
context.setLineDash(renderOptions.lineDash);
|
|
|
context.lineDashOffset = renderOptions.lineDashOffset;
|
|
|
}
|
|
|
context.lineJoin = renderOptions.lineJoin;
|
|
|
context.miterLimit = renderOptions.miterLimit;
|
|
|
context.stroke();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @private
|
|
|
* @param {RenderOptions} renderOptions Render options.
|
|
|
*/
|
|
|
createHitDetectionCanvas_(renderOptions) {
|
|
|
if (this.fill_) {
|
|
|
let color = this.fill_.getColor();
|
|
|
|
|
|
// determine if fill is transparent (or pattern or gradient)
|
|
|
let opacity = 0;
|
|
|
if (typeof color === 'string') {
|
|
|
color = asArray(color);
|
|
|
}
|
|
|
if (color === null) {
|
|
|
opacity = 1;
|
|
|
} else if (Array.isArray(color)) {
|
|
|
opacity = color.length === 4 ? color[3] : 1;
|
|
|
}
|
|
|
if (opacity === 0) {
|
|
|
// if a transparent fill style is set, create an extra hit-detection image
|
|
|
// with a default fill style
|
|
|
const context = createCanvasContext2D(
|
|
|
renderOptions.size,
|
|
|
renderOptions.size
|
|
|
);
|
|
|
this.hitDetectionCanvas_ = context.canvas;
|
|
|
|
|
|
this.drawHitDetectionCanvas_(renderOptions, context);
|
|
|
}
|
|
|
}
|
|
|
if (!this.hitDetectionCanvas_) {
|
|
|
this.hitDetectionCanvas_ = this.getImage(1);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @private
|
|
|
* @param {CanvasRenderingContext2D} context The context to draw in.
|
|
|
*/
|
|
|
createPath_(context) {
|
|
|
let points = this.points_;
|
|
|
const radius = this.radius_;
|
|
|
if (points === Infinity) {
|
|
|
context.arc(0, 0, radius, 0, 2 * Math.PI);
|
|
|
} else {
|
|
|
const radius2 = this.radius2_ === undefined ? radius : this.radius2_;
|
|
|
if (this.radius2_ !== undefined) {
|
|
|
points *= 2;
|
|
|
}
|
|
|
const startAngle = this.angle_ - Math.PI / 2;
|
|
|
const step = (2 * Math.PI) / points;
|
|
|
for (let i = 0; i < points; i++) {
|
|
|
const angle0 = startAngle + i * step;
|
|
|
const radiusC = i % 2 === 0 ? radius : radius2;
|
|
|
context.lineTo(radiusC * Math.cos(angle0), radiusC * Math.sin(angle0));
|
|
|
}
|
|
|
context.closePath();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @private
|
|
|
* @param {RenderOptions} renderOptions Render options.
|
|
|
* @param {CanvasRenderingContext2D} context The context.
|
|
|
*/
|
|
|
drawHitDetectionCanvas_(renderOptions, context) {
|
|
|
// set origin to canvas center
|
|
|
context.translate(renderOptions.size / 2, renderOptions.size / 2);
|
|
|
|
|
|
this.createPath_(context);
|
|
|
|
|
|
context.fillStyle = defaultFillStyle;
|
|
|
context.fill();
|
|
|
if (this.stroke_) {
|
|
|
context.strokeStyle = renderOptions.strokeStyle;
|
|
|
context.lineWidth = renderOptions.strokeWidth;
|
|
|
if (renderOptions.lineDash) {
|
|
|
context.setLineDash(renderOptions.lineDash);
|
|
|
context.lineDashOffset = renderOptions.lineDashOffset;
|
|
|
}
|
|
|
context.lineJoin = renderOptions.lineJoin;
|
|
|
context.miterLimit = renderOptions.miterLimit;
|
|
|
context.stroke();
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
export default RegularShape;
|
