源码分析之Openlayers中样式篇Text类

访问Openlayers网站(https://jinuss.github.io/Openlayers_map_pages/，网站是基于Vue3 + Openlayers，里面有大量的实践和案例。觉得还不错，可以给个小星星Star，鼓励一波 https://github.com/Jinuss/OpenlayersMap哦~

概述

Text 类是 Openlayers 中用于配置和绘制文本标注的类。它提供了多种选项来控制文本的外观、位置、旋转、缩放、填充、背景、边框等属性。该类通常用于地图上的标注对象，允许开发者自定义文本样式。

源码分析

`Text`类源码实现

Text类源码实现如下：

class Text {
  constructor(options) {
    options = options || {};
    this.font_ = options.font;
    this.rotation_ = options.rotation;
    this.rotateWidthView_ = options.rotateWithView;
    this.scale_ = options.scale;
    this.scaleArray_ = toSize(options.scale !== undefined ? options.scale : 1);
    this.text_ = options.text;
    this.textAlign_ = options.textAlign;
    this.justify_ = options.justify;
    this.repeat_ = options.repeat;
    this.textBaseline_ = options.textBaseline;
    this.fill_ =
      options.fill !== undefined
        ? options.fill
        : new Fill({ color: DEFAULT_FILL_COLOR });
    this.maxAngle_ =
      options.maxAngle !== undefined ? options.maxAngle : Math.PI / 4;

    this.placement_ =
      options.placement !== undefined ? options.placement : "point";

    this.overflow_ = !!options.overflow;
    this.stroke_ = options.stroke !== undefined ? options.stroke : null;
    this.offsetX_ = options.offsetX !== undefined ? options.offsetX : 0;

    this.offsetY_ = options.offsetY !== undefined ? options.offsetY : 0;

    this.backgroundFill_ = options.backgroundFill
      ? options.backgroundFill
      : null;

    this.backgroundStroke_ = options.backgroundStroke
      ? options.backgroundStroke
      : null;

    this.padding_ = options.padding === undefined ? null : options.padding;

    this.declutterMode_ = options.declutterMode;
  }

  clone() {
    const scale = this.getScale();
    return new Text({
      font: this.getFont(),
      placement: this.getPlacement(),
      repeat: this.getRepeat(),
      maxAngle: this.getMaxAngle(),
      overflow: this.getOverflow(),
      rotation: this.getRotation(),
      rotateWithView: this.getRotateWithView(),
      scale: Array.isArray(scale) ? scale.slice() : scale,
      text: this.getText(),
      textAlign: this.getTextAlign(),
      justify: this.getJustify(),
      textBaseline: this.getTextBaseline(),
      fill: this.getFill() ? this.getFill().clone() : undefined,
      stroke: this.getStroke() ? this.getStroke().clone() : undefined,
      offsetX: this.getOffsetX(),
      offsetY: this.getOffsetY(),
      backgroundFill: this.getBackgroundFill()
        ? this.getBackgroundFill().clone()
        : undefined,
      backgroundStroke: this.getBackgroundStroke()
        ? this.getBackgroundStroke().clone()
        : undefined,
      padding: this.getPadding() || undefined,
      declutterMode: this.getDeclutterMode(),
    });
  }
  getOverflow() {
    return this.overflow_;
  }
  getFont() {
    return this.font_;
  }
  getMaxAngle() {
    return this.maxAngle_;
  }
  getPlacement() {
    return this.placement_;
  }
  getRepeat() {
    return this.repeat_;
  }
  getOffsetX() {
    return this.offsetX_;
  }
  getOffsetY() {
    return this.offsetY_;
  }
  getFill() {
    return this.fill_;
  }
  getRotateWithView() {
    return this.rotateWithView_;
  }
  getRotation() {
    return this.rotation_;
  }
  getScale() {
    return this.scale_;
  }
  getScaleArray() {
    return this.scaleArray_;
  }
  getStroke() {
    return this.stroke_;
  }
  getText() {
    return this.text_;
  }
  getTextAlign() {
    return this.textAlign_;
  }
  getJustify() {
    return this.justify_;
  }
  getTextBaseline() {
    return this.textBaseline_;
  }
  getBackgroundFill() {
    return this.backgroundFill_;
  }
  getBackgroundStroke() {
    return this.backgroundStroke_;
  }
  getPadding() {
    return this.padding_;
  }
  getDeclutterMode() {
    return this.declutterMode_;
  }
  setOverflow(overflow) {
    this.overflow_ = overflow;
  }
  setFont(font) {
    this.font_ = font;
  }
  setMaxAngle(maxAngle) {
    this.maxAngle_ = maxAngle;
  }
  setOffsetX(offsetX) {
    this.offsetX_ = offsetX;
  }
  setOffsetY(offsetY) {
    this.offsetY_ = offsetY;
  }
  setPlacement(placement) {
    this.placement_ = placement;
  }
  setRepeat(repeat) {
    this.repeat_ = repeat;
  }
  setRotateWithView(rotateWithView) {
    this.rotateWithView_ = rotateWithView;
  }
  setFill(fill) {
    this.fill_ = fill;
  }
  setRotation(rotation) {
    this.rotation_ = rotation;
  }
  setScale(scale) {
    this.scale_ = scale;
    this.scaleArray_ = toSize(scale !== undefined ? scale : 1);
  }
  setStroke(stroke) {
    this.stroke_ = stroke;
  }
  setText(text) {
    this.text_ = text;
  }
  setTextAlign(textAlign) {
    this.textAlign_ = textAlign;
  }
  setJustify(justify) {
    this.justify_ = justify;
  }
  setTextBaseline(textBaseline) {
    this.textBaseline_ = textBaseline;
  }
  setBackgroundFill(fill) {
    this.backgroundFill_ = fill;
  }
  setBackgroundStroke(stroke) {
    this.backgroundStroke_ = stroke;
  }
  setPadding(padding) {
    this.padding_ = padding;
  }
}