PolarAxisPointer.js
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/*
* 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.
*/
import * as formatUtil from '../../util/format';
import BaseAxisPointer from './BaseAxisPointer';
import * as graphic from '../../util/graphic';
import * as viewHelper from './viewHelper';
import * as matrix from 'zrender/src/core/matrix';
import AxisBuilder from '../axis/AxisBuilder';
import AxisView from '../axis/AxisView';
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);
export default PolarAxisPointer;