PolarAxisPointer.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

var formatUtil = require("../../util/format");

var BaseAxisPointer = require("./BaseAxisPointer");

var graphic = require("../../util/graphic");

var viewHelper = require("./viewHelper");

var matrix = require("zrender/lib/core/matrix");

var AxisBuilder = require("../axis/AxisBuilder");

var AxisView = require("../axis/AxisView");

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
var PolarAxisPointer = BaseAxisPointer.extend({
  /**
   * @override
   */
  makeElOption: function (elOption, value, axisModel, axisPointerModel, api) {
    var axis = axisModel.axis;

    if (axis.dim === 'angle') {
      this.animationThreshold = Math.PI / 18;
    }

    var polar = axis.polar;
    var otherAxis = polar.getOtherAxis(axis);
    var otherExtent = otherAxis.getExtent();
    var coordValue;
    coordValue = axis['dataTo' + formatUtil.capitalFirst(axis.dim)](value);
    var axisPointerType = axisPointerModel.get('type');

    if (axisPointerType && axisPointerType !== 'none') {
      var elStyle = viewHelper.buildElStyle(axisPointerModel);
      var pointerOption = pointerShapeBuilder[axisPointerType](axis, polar, coordValue, otherExtent, elStyle);
      pointerOption.style = elStyle;
      elOption.graphicKey = pointerOption.type;
      elOption.pointer = pointerOption;
    }

    var labelMargin = axisPointerModel.get('label.margin');
    var labelPos = getLabelPosition(value, axisModel, axisPointerModel, polar, labelMargin);
    viewHelper.buildLabelElOption(elOption, axisModel, axisPointerModel, api, labelPos);
  } // Do not support handle, utill any user requires it.

});

function getLabelPosition(value, axisModel, axisPointerModel, polar, labelMargin) {
  var axis = axisModel.axis;
  var coord = axis.dataToCoord(value);
  var axisAngle = polar.getAngleAxis().getExtent()[0];
  axisAngle = axisAngle / 180 * Math.PI;
  var radiusExtent = polar.getRadiusAxis().getExtent();
  var position;
  var align;
  var verticalAlign;

  if (axis.dim === 'radius') {
    var transform = matrix.create();
    matrix.rotate(transform, transform, axisAngle);
    matrix.translate(transform, transform, [polar.cx, polar.cy]);
    position = graphic.applyTransform([coord, -labelMargin], transform);
    var labelRotation = axisModel.getModel('axisLabel').get('rotate') || 0;
    var labelLayout = AxisBuilder.innerTextLayout(axisAngle, labelRotation * Math.PI / 180, -1);
    align = labelLayout.textAlign;
    verticalAlign = labelLayout.textVerticalAlign;
  } else {
    // angle axis
    var r = radiusExtent[1];
    position = polar.coordToPoint([r + labelMargin, coord]);
    var cx = polar.cx;
    var cy = polar.cy;
    align = Math.abs(position[0] - cx) / r < 0.3 ? 'center' : position[0] > cx ? 'left' : 'right';
    verticalAlign = Math.abs(position[1] - cy) / r < 0.3 ? 'middle' : position[1] > cy ? 'top' : 'bottom';
  }

  return {
    position: position,
    align: align,
    verticalAlign: verticalAlign
  };
}

var pointerShapeBuilder = {
  line: function (axis, polar, coordValue, otherExtent, elStyle) {
    return axis.dim === 'angle' ? {
      type: 'Line',
      shape: viewHelper.makeLineShape(polar.coordToPoint([otherExtent[0], coordValue]), polar.coordToPoint([otherExtent[1], coordValue]))
    } : {
      type: 'Circle',
      shape: {
        cx: polar.cx,
        cy: polar.cy,
        r: coordValue
      }
    };
  },
  shadow: function (axis, polar, coordValue, otherExtent, elStyle) {
    var bandWidth = Math.max(1, axis.getBandWidth());
    var radian = Math.PI / 180;
    return axis.dim === 'angle' ? {
      type: 'Sector',
      shape: viewHelper.makeSectorShape(polar.cx, polar.cy, otherExtent[0], otherExtent[1], // In ECharts y is negative if angle is positive
      (-coordValue - bandWidth / 2) * radian, (-coordValue + bandWidth / 2) * radian)
    } : {
      type: 'Sector',
      shape: viewHelper.makeSectorShape(polar.cx, polar.cy, coordValue - bandWidth / 2, coordValue + bandWidth / 2, 0, Math.PI * 2)
    };
  }
};
AxisView.registerAxisPointerClass('PolarAxisPointer', PolarAxisPointer);
var _default = PolarAxisPointer;
module.exports = _default;