/**
* @module echarts/chart/helper/Line
*/
define(function (require) {
var symbolUtil = require('../../util/symbol');
var vector = require('zrender/core/vector');
// var matrix = require('zrender/core/matrix');
var LinePath = require('./LinePath');
var graphic = require('../../util/graphic');
var zrUtil = require('zrender/core/util');
var numberUtil = require('../../util/number');
var SYMBOL_CATEGORIES = ['fromSymbol', 'toSymbol'];
function makeSymbolTypeKey(symbolCategory) {
return '_' + symbolCategory + 'Type';
}
/**
* @inner
*/
function createSymbol(name, lineData, idx) {
var color = lineData.getItemVisual(idx, 'color');
var symbolType = lineData.getItemVisual(idx, name);
var symbolSize = lineData.getItemVisual(idx, name + 'Size');
if (!symbolType || symbolType === 'none') {
return;
}
if (!zrUtil.isArray(symbolSize)) {
symbolSize = [symbolSize, symbolSize];
}
var symbolPath = symbolUtil.createSymbol(
symbolType, -symbolSize[0] / 2, -symbolSize[1] / 2,
symbolSize[0], symbolSize[1], color
);
symbolPath.name = name;
return symbolPath;
}
function createLine(points) {
var line = new LinePath({
name: 'line'
});
setLinePoints(line.shape, points);
return line;
}
function setLinePoints(targetShape, points) {
var p1 = points[0];
var p2 = points[1];
var cp1 = points[2];
targetShape.x1 = p1[0];
targetShape.y1 = p1[1];
targetShape.x2 = p2[0];
targetShape.y2 = p2[1];
targetShape.percent = 1;
if (cp1) {
targetShape.cpx1 = cp1[0];
targetShape.cpy1 = cp1[1];
}
}
function updateSymbolAndLabelBeforeLineUpdate () {
var lineGroup = this;
var symbolFrom = lineGroup.childOfName('fromSymbol');
var symbolTo = lineGroup.childOfName('toSymbol');
var label = lineGroup.childOfName('label');
// Quick reject
if (!symbolFrom && !symbolTo && label.ignore) {
return;
}
var invScale = 1;
var parentNode = this.parent;
while (parentNode) {
if (parentNode.scale) {
invScale /= parentNode.scale[0];
}
parentNode = parentNode.parent;
}
var line = lineGroup.childOfName('line');
// If line not changed
// FIXME Parent scale changed
if (!this.__dirty && !line.__dirty) {
return;
}
var percent = line.shape.percent;
var fromPos = line.pointAt(0);
var toPos = line.pointAt(percent);
var d = vector.sub([], toPos, fromPos);
vector.normalize(d, d);
if (symbolFrom) {
symbolFrom.attr('position', fromPos);
var tangent = line.tangentAt(0);
symbolFrom.attr('rotation', Math.PI / 2 - Math.atan2(
tangent[1], tangent[0]
));
symbolFrom.attr('scale', [invScale * percent, invScale * percent]);
}
if (symbolTo) {
symbolTo.attr('position', toPos);
var tangent = line.tangentAt(1);
symbolTo.attr('rotation', -Math.PI / 2 - Math.atan2(
tangent[1], tangent[0]
));
symbolTo.attr('scale', [invScale * percent, invScale * percent]);
}
if (!label.ignore) {
label.attr('position', toPos);
var textPosition;
var textAlign;
var textVerticalAlign;
var distance = 5 * invScale;
// End
if (label.__position === 'end') {
textPosition = [d[0] * distance + toPos[0], d[1] * distance + toPos[1]];
textAlign = d[0] > 0.8 ? 'left' : (d[0] < -0.8 ? 'right' : 'center');
textVerticalAlign = d[1] > 0.8 ? 'top' : (d[1] < -0.8 ? 'bottom' : 'middle');
}
// Middle
else if (label.__position === 'middle') {
var halfPercent = percent / 2;
var tangent = line.tangentAt(halfPercent);
var n = [tangent[1], -tangent[0]];
var cp = line.pointAt(halfPercent);
if (n[1] > 0) {
n[0] = -n[0];
n[1] = -n[1];
}
textPosition = [cp[0] + n[0] * distance, cp[1] + n[1] * distance];
textAlign = 'center';
textVerticalAlign = 'bottom';
var rotation = -Math.atan2(tangent[1], tangent[0]);
if (toPos[0] < fromPos[0]) {
rotation = Math.PI + rotation;
}
label.attr('rotation', rotation);
}
// Start
else {
textPosition = [-d[0] * distance + fromPos[0], -d[1] * distance + fromPos[1]];
textAlign = d[0] > 0.8 ? 'right' : (d[0] < -0.8 ? 'left' : 'center');
textVerticalAlign = d[1] > 0.8 ? 'bottom' : (d[1] < -0.8 ? 'top' : 'middle');
}
label.attr({
style: {
// Use the user specified text align and baseline first
textVerticalAlign: label.__verticalAlign || textVerticalAlign,
textAlign: label.__textAlign || textAlign
},
position: textPosition,
scale: [invScale, invScale]
});
}
}
/**
* @constructor
* @extends {module:zrender/graphic/Group}
* @alias {module:echarts/chart/helper/Line}
*/
function Line(lineData, idx) {
graphic.Group.call(this);
this._createLine(lineData, idx);
}
var lineProto = Line.prototype;
// Update symbol position and rotation
lineProto.beforeUpdate = updateSymbolAndLabelBeforeLineUpdate;
lineProto._createLine = function (lineData, idx) {
var seriesModel = lineData.hostModel;
var linePoints = lineData.getItemLayout(idx);
var line = createLine(linePoints);
line.shape.percent = 0;
graphic.initProps(line, {
shape: {
percent: 1
}
}, seriesModel, idx);
this.add(line);
var label = new graphic.Text({
name: 'label'
});
this.add(label);
zrUtil.each(SYMBOL_CATEGORIES, function (symbolCategory) {
var symbol = createSymbol(symbolCategory, lineData, idx);
// symbols must added after line to make sure
// it will be updated after line#update.
// Or symbol position and rotation update in line#beforeUpdate will be one frame slow
this.add(symbol);
this[makeSymbolTypeKey(symbolCategory)] = lineData.getItemVisual(idx, symbolCategory);
}, this);
this._updateCommonStl(lineData, idx);
};
lineProto.updateData = function (lineData, idx) {
var seriesModel = lineData.hostModel;
var line = this.childOfName('line');
var linePoints = lineData.getItemLayout(idx);
var target = {
shape: {}
};
setLinePoints(target.shape, linePoints);
graphic.updateProps(line, target, seriesModel, idx);
zrUtil.each(SYMBOL_CATEGORIES, function (symbolCategory) {
var symbolType = lineData.getItemVisual(idx, symbolCategory);
var key = makeSymbolTypeKey(symbolCategory);
// Symbol changed
if (this[key] !== symbolType) {
var symbol = createSymbol(symbolCategory, lineData, idx);
this.remove(this.childOfName(symbolCategory));
this.add(symbol);
}
this[key] = symbolType;
}, this);
this._updateCommonStl(lineData, idx);
};
lineProto._updateCommonStl = function (lineData, idx) {
var seriesModel = lineData.hostModel;
var line = this.childOfName('line');
var itemModel = lineData.getItemModel(idx);
var labelModel = itemModel.getModel('label.normal');
var textStyleModel = labelModel.getModel('textStyle');
var labelHoverModel = itemModel.getModel('label.emphasis');
var textStyleHoverModel = labelHoverModel.getModel('textStyle');
var defaultText = numberUtil.round(seriesModel.getRawValue(idx));
if (isNaN(defaultText)) {
// Use name
defaultText = lineData.getName(idx);
}
line.useStyle(zrUtil.extend(
{
strokeNoScale: true,
fill: 'none',
stroke: lineData.getItemVisual(idx, 'color')
},
itemModel.getModel('lineStyle.normal').getLineStyle()
));
line.hoverStyle = itemModel.getModel('lineStyle.emphasis').getLineStyle();
var defaultColor = lineData.getItemVisual(idx, 'color') || '#000';
var label = this.childOfName('label');
// label.afterUpdate = lineAfterUpdate;
label.setStyle({
text: labelModel.get('show')
? zrUtil.retrieve(
seriesModel.getFormattedLabel(idx, 'normal', lineData.dataType),
defaultText
)
: '',
textFont: textStyleModel.getFont(),
fill: textStyleModel.getTextColor() || defaultColor
});
label.hoverStyle = {
text: labelHoverModel.get('show')
? zrUtil.retrieve(
seriesModel.getFormattedLabel(idx, 'emphasis', lineData.dataType),
defaultText
)
: '',
textFont: textStyleHoverModel.getFont(),
fill: textStyleHoverModel.getTextColor() || defaultColor
};
label.__textAlign = textStyleModel.get('align');
label.__verticalAlign = textStyleModel.get('baseline');
label.__position = labelModel.get('position');
label.ignore = !label.style.text && !label.hoverStyle.text;
graphic.setHoverStyle(this);
};
lineProto.updateLayout = function (lineData, idx) {
var points = lineData.getItemLayout(idx);
var linePath = this.childOfName('line');
setLinePoints(linePath.shape, points);
linePath.dirty(true);
};
lineProto.setLinePoints = function (points) {
var linePath = this.childOfName('line');
setLinePoints(linePath.shape, points);
linePath.dirty();
};
zrUtil.inherits(Line, graphic.Group);
return Line;
});
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