lepu-test-platform-web/node_modules/echarts/lib/chart/helper/LargeSymbolDraw.js

302 lines
8.3 KiB
JavaScript

/*
* 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 graphic = require("../../util/graphic");
var _symbol = require("../../util/symbol");
var createSymbol = _symbol.createSymbol;
var IncrementalDisplayable = require("zrender/lib/graphic/IncrementalDisplayable");
/*
* 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.
*/
/* global Float32Array */
// TODO Batch by color
var BOOST_SIZE_THRESHOLD = 4;
var LargeSymbolPath = graphic.extendShape({
shape: {
points: null
},
symbolProxy: null,
softClipShape: null,
buildPath: function (path, shape) {
var points = shape.points;
var size = shape.size;
var symbolProxy = this.symbolProxy;
var symbolProxyShape = symbolProxy.shape;
var ctx = path.getContext ? path.getContext() : path;
var canBoost = ctx && size[0] < BOOST_SIZE_THRESHOLD; // Do draw in afterBrush.
if (canBoost) {
return;
}
for (var i = 0; i < points.length;) {
var x = points[i++];
var y = points[i++];
if (isNaN(x) || isNaN(y)) {
continue;
}
if (this.softClipShape && !this.softClipShape.contain(x, y)) {
continue;
}
symbolProxyShape.x = x - size[0] / 2;
symbolProxyShape.y = y - size[1] / 2;
symbolProxyShape.width = size[0];
symbolProxyShape.height = size[1];
symbolProxy.buildPath(path, symbolProxyShape, true);
}
},
afterBrush: function (ctx) {
var shape = this.shape;
var points = shape.points;
var size = shape.size;
var canBoost = size[0] < BOOST_SIZE_THRESHOLD;
if (!canBoost) {
return;
}
this.setTransform(ctx); // PENDING If style or other canvas status changed?
for (var i = 0; i < points.length;) {
var x = points[i++];
var y = points[i++];
if (isNaN(x) || isNaN(y)) {
continue;
}
if (this.softClipShape && !this.softClipShape.contain(x, y)) {
continue;
} // fillRect is faster than building a rect path and draw.
// And it support light globalCompositeOperation.
ctx.fillRect(x - size[0] / 2, y - size[1] / 2, size[0], size[1]);
}
this.restoreTransform(ctx);
},
findDataIndex: function (x, y) {
// TODO ???
// Consider transform
var shape = this.shape;
var points = shape.points;
var size = shape.size;
var w = Math.max(size[0], 4);
var h = Math.max(size[1], 4); // Not consider transform
// Treat each element as a rect
// top down traverse
for (var idx = points.length / 2 - 1; idx >= 0; idx--) {
var i = idx * 2;
var x0 = points[i] - w / 2;
var y0 = points[i + 1] - h / 2;
if (x >= x0 && y >= y0 && x <= x0 + w && y <= y0 + h) {
return idx;
}
}
return -1;
}
});
function LargeSymbolDraw() {
this.group = new graphic.Group();
}
var largeSymbolProto = LargeSymbolDraw.prototype;
largeSymbolProto.isPersistent = function () {
return !this._incremental;
};
/**
* Update symbols draw by new data
* @param {module:echarts/data/List} data
* @param {Object} opt
* @param {Object} [opt.clipShape]
*/
largeSymbolProto.updateData = function (data, opt) {
this.group.removeAll();
var symbolEl = new LargeSymbolPath({
rectHover: true,
cursor: 'default'
});
symbolEl.setShape({
points: data.getLayout('symbolPoints')
});
this._setCommon(symbolEl, data, false, opt);
this.group.add(symbolEl);
this._incremental = null;
};
largeSymbolProto.updateLayout = function (data) {
if (this._incremental) {
return;
}
var points = data.getLayout('symbolPoints');
this.group.eachChild(function (child) {
if (child.startIndex != null) {
var len = (child.endIndex - child.startIndex) * 2;
var byteOffset = child.startIndex * 4 * 2;
points = new Float32Array(points.buffer, byteOffset, len);
}
child.setShape('points', points);
});
};
largeSymbolProto.incrementalPrepareUpdate = function (data) {
this.group.removeAll();
this._clearIncremental(); // Only use incremental displayables when data amount is larger than 2 million.
// PENDING Incremental data?
if (data.count() > 2e6) {
if (!this._incremental) {
this._incremental = new IncrementalDisplayable({
silent: true
});
}
this.group.add(this._incremental);
} else {
this._incremental = null;
}
};
largeSymbolProto.incrementalUpdate = function (taskParams, data, opt) {
var symbolEl;
if (this._incremental) {
symbolEl = new LargeSymbolPath();
this._incremental.addDisplayable(symbolEl, true);
} else {
symbolEl = new LargeSymbolPath({
rectHover: true,
cursor: 'default',
startIndex: taskParams.start,
endIndex: taskParams.end
});
symbolEl.incremental = true;
this.group.add(symbolEl);
}
symbolEl.setShape({
points: data.getLayout('symbolPoints')
});
this._setCommon(symbolEl, data, !!this._incremental, opt);
};
largeSymbolProto._setCommon = function (symbolEl, data, isIncremental, opt) {
var hostModel = data.hostModel;
opt = opt || {}; // TODO
// if (data.hasItemVisual.symbolSize) {
// // TODO typed array?
// symbolEl.setShape('sizes', data.mapArray(
// function (idx) {
// var size = data.getItemVisual(idx, 'symbolSize');
// return (size instanceof Array) ? size : [size, size];
// }
// ));
// }
// else {
var size = data.getVisual('symbolSize');
symbolEl.setShape('size', size instanceof Array ? size : [size, size]); // }
symbolEl.softClipShape = opt.clipShape || null; // Create symbolProxy to build path for each data
symbolEl.symbolProxy = createSymbol(data.getVisual('symbol'), 0, 0, 0, 0); // Use symbolProxy setColor method
symbolEl.setColor = symbolEl.symbolProxy.setColor;
var extrudeShadow = symbolEl.shape.size[0] < BOOST_SIZE_THRESHOLD;
symbolEl.useStyle( // Draw shadow when doing fillRect is extremely slow.
hostModel.getModel('itemStyle').getItemStyle(extrudeShadow ? ['color', 'shadowBlur', 'shadowColor'] : ['color']));
var visualColor = data.getVisual('color');
if (visualColor) {
symbolEl.setColor(visualColor);
}
if (!isIncremental) {
// Enable tooltip
// PENDING May have performance issue when path is extremely large
symbolEl.seriesIndex = hostModel.seriesIndex;
symbolEl.on('mousemove', function (e) {
symbolEl.dataIndex = null;
var dataIndex = symbolEl.findDataIndex(e.offsetX, e.offsetY);
if (dataIndex >= 0) {
// Provide dataIndex for tooltip
symbolEl.dataIndex = dataIndex + (symbolEl.startIndex || 0);
}
});
}
};
largeSymbolProto.remove = function () {
this._clearIncremental();
this._incremental = null;
this.group.removeAll();
};
largeSymbolProto._clearIncremental = function () {
var incremental = this._incremental;
if (incremental) {
incremental.clearDisplaybles();
}
};
var _default = LargeSymbolDraw;
module.exports = _default;