AngleAxisView.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 zrUtil = require("zrender/lib/core/util");

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

var Model = require("../../model/Model");

var AxisView = require("./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 elementList = ['axisLine', 'axisLabel', 'axisTick', 'splitLine', 'splitArea'];

function getAxisLineShape(polar, rExtent, angle) {
  rExtent[1] > rExtent[0] && (rExtent = rExtent.slice().reverse());
  var start = polar.coordToPoint([rExtent[0], angle]);
  var end = polar.coordToPoint([rExtent[1], angle]);
  return {
    x1: start[0],
    y1: start[1],
    x2: end[0],
    y2: end[1]
  };
}

function getRadiusIdx(polar) {
  var radiusAxis = polar.getRadiusAxis();
  return radiusAxis.inverse ? 0 : 1;
} // Remove the last tick which will overlap the first tick


function fixAngleOverlap(list) {
  var firstItem = list[0];
  var lastItem = list[list.length - 1];

  if (firstItem && lastItem && Math.abs(Math.abs(firstItem.coord - lastItem.coord) - 360) < 1e-4) {
    list.pop();
  }
}

var _default = AxisView.extend({
  type: 'angleAxis',
  axisPointerClass: 'PolarAxisPointer',
  render: function (angleAxisModel, ecModel) {
    this.group.removeAll();

    if (!angleAxisModel.get('show')) {
      return;
    }

    var angleAxis = angleAxisModel.axis;
    var polar = angleAxis.polar;
    var radiusExtent = polar.getRadiusAxis().getExtent();
    var ticksAngles = angleAxis.getTicksCoords();
    var labels = zrUtil.map(angleAxis.getViewLabels(), function (labelItem) {
      var labelItem = zrUtil.clone(labelItem);
      labelItem.coord = angleAxis.dataToCoord(labelItem.tickValue);
      return labelItem;
    });
    fixAngleOverlap(labels);
    fixAngleOverlap(ticksAngles);
    zrUtil.each(elementList, function (name) {
      if (angleAxisModel.get(name + '.show') && (!angleAxis.scale.isBlank() || name === 'axisLine')) {
        this['_' + name](angleAxisModel, polar, ticksAngles, radiusExtent, labels);
      }
    }, this);
  },

  /**
   * @private
   */
  _axisLine: function (angleAxisModel, polar, ticksAngles, radiusExtent) {
    var lineStyleModel = angleAxisModel.getModel('axisLine.lineStyle');
    var circle = new graphic.Circle({
      shape: {
        cx: polar.cx,
        cy: polar.cy,
        r: radiusExtent[getRadiusIdx(polar)]
      },
      style: lineStyleModel.getLineStyle(),
      z2: 1,
      silent: true
    });
    circle.style.fill = null;
    this.group.add(circle);
  },

  /**
   * @private
   */
  _axisTick: function (angleAxisModel, polar, ticksAngles, radiusExtent) {
    var tickModel = angleAxisModel.getModel('axisTick');
    var tickLen = (tickModel.get('inside') ? -1 : 1) * tickModel.get('length');
    var radius = radiusExtent[getRadiusIdx(polar)];
    var lines = zrUtil.map(ticksAngles, function (tickAngleItem) {
      return new graphic.Line({
        shape: getAxisLineShape(polar, [radius, radius + tickLen], tickAngleItem.coord)
      });
    });
    this.group.add(graphic.mergePath(lines, {
      style: zrUtil.defaults(tickModel.getModel('lineStyle').getLineStyle(), {
        stroke: angleAxisModel.get('axisLine.lineStyle.color')
      })
    }));
  },

  /**
   * @private
   */
  _axisLabel: function (angleAxisModel, polar, ticksAngles, radiusExtent, labels) {
    var rawCategoryData = angleAxisModel.getCategories(true);
    var commonLabelModel = angleAxisModel.getModel('axisLabel');
    var labelMargin = commonLabelModel.get('margin'); // Use length of ticksAngles because it may remove the last tick to avoid overlapping

    zrUtil.each(labels, function (labelItem, idx) {
      var labelModel = commonLabelModel;
      var tickValue = labelItem.tickValue;
      var r = radiusExtent[getRadiusIdx(polar)];
      var p = polar.coordToPoint([r + labelMargin, labelItem.coord]);
      var cx = polar.cx;
      var cy = polar.cy;
      var labelTextAlign = Math.abs(p[0] - cx) / r < 0.3 ? 'center' : p[0] > cx ? 'left' : 'right';
      var labelTextVerticalAlign = Math.abs(p[1] - cy) / r < 0.3 ? 'middle' : p[1] > cy ? 'top' : 'bottom';

      if (rawCategoryData && rawCategoryData[tickValue] && rawCategoryData[tickValue].textStyle) {
        labelModel = new Model(rawCategoryData[tickValue].textStyle, commonLabelModel, commonLabelModel.ecModel);
      }

      var textEl = new graphic.Text({
        silent: true
      });
      this.group.add(textEl);
      graphic.setTextStyle(textEl.style, labelModel, {
        x: p[0],
        y: p[1],
        textFill: labelModel.getTextColor() || angleAxisModel.get('axisLine.lineStyle.color'),
        text: labelItem.formattedLabel,
        textAlign: labelTextAlign,
        textVerticalAlign: labelTextVerticalAlign
      });
    }, this);
  },

  /**
   * @private
   */
  _splitLine: function (angleAxisModel, polar, ticksAngles, radiusExtent) {
    var splitLineModel = angleAxisModel.getModel('splitLine');
    var lineStyleModel = splitLineModel.getModel('lineStyle');
    var lineColors = lineStyleModel.get('color');
    var lineCount = 0;
    lineColors = lineColors instanceof Array ? lineColors : [lineColors];
    var splitLines = [];

    for (var i = 0; i < ticksAngles.length; i++) {
      var colorIndex = lineCount++ % lineColors.length;
      splitLines[colorIndex] = splitLines[colorIndex] || [];
      splitLines[colorIndex].push(new graphic.Line({
        shape: getAxisLineShape(polar, radiusExtent, ticksAngles[i].coord)
      }));
    } // Simple optimization
    // Batching the lines if color are the same


    for (var i = 0; i < splitLines.length; i++) {
      this.group.add(graphic.mergePath(splitLines[i], {
        style: zrUtil.defaults({
          stroke: lineColors[i % lineColors.length]
        }, lineStyleModel.getLineStyle()),
        silent: true,
        z: angleAxisModel.get('z')
      }));
    }
  },

  /**
   * @private
   */
  _splitArea: function (angleAxisModel, polar, ticksAngles, radiusExtent) {
    if (!ticksAngles.length) {
      return;
    }

    var splitAreaModel = angleAxisModel.getModel('splitArea');
    var areaStyleModel = splitAreaModel.getModel('areaStyle');
    var areaColors = areaStyleModel.get('color');
    var lineCount = 0;
    areaColors = areaColors instanceof Array ? areaColors : [areaColors];
    var splitAreas = [];
    var RADIAN = Math.PI / 180;
    var prevAngle = -ticksAngles[0].coord * RADIAN;
    var r0 = Math.min(radiusExtent[0], radiusExtent[1]);
    var r1 = Math.max(radiusExtent[0], radiusExtent[1]);
    var clockwise = angleAxisModel.get('clockwise');

    for (var i = 1; i < ticksAngles.length; i++) {
      var colorIndex = lineCount++ % areaColors.length;
      splitAreas[colorIndex] = splitAreas[colorIndex] || [];
      splitAreas[colorIndex].push(new graphic.Sector({
        shape: {
          cx: polar.cx,
          cy: polar.cy,
          r0: r0,
          r: r1,
          startAngle: prevAngle,
          endAngle: -ticksAngles[i].coord * RADIAN,
          clockwise: clockwise
        },
        silent: true
      }));
      prevAngle = -ticksAngles[i].coord * RADIAN;
    } // Simple optimization
    // Batching the lines if color are the same


    for (var i = 0; i < splitAreas.length; i++) {
      this.group.add(graphic.mergePath(splitAreas[i], {
        style: zrUtil.defaults({
          fill: areaColors[i % areaColors.length]
        }, areaStyleModel.getAreaStyle()),
        silent: true
      }));
    }
  }
});

module.exports = _default;