lepu-test-platform-web/node_modules/echarts/lib/coord/axisTickLabelBuilder.js

372 lines
13 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 zrUtil = require("zrender/lib/core/util");
var textContain = require("zrender/lib/contain/text");
var _model = require("../util/model");
var makeInner = _model.makeInner;
var _axisHelper = require("./axisHelper");
var makeLabelFormatter = _axisHelper.makeLabelFormatter;
var getOptionCategoryInterval = _axisHelper.getOptionCategoryInterval;
var shouldShowAllLabels = _axisHelper.shouldShowAllLabels;
/*
* 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 inner = makeInner();
/**
* @param {module:echats/coord/Axis} axis
* @return {Object} {
* labels: [{
* formattedLabel: string,
* rawLabel: string,
* tickValue: number
* }, ...],
* labelCategoryInterval: number
* }
*/
function createAxisLabels(axis) {
// Only ordinal scale support tick interval
return axis.type === 'category' ? makeCategoryLabels(axis) : makeRealNumberLabels(axis);
}
/**
* @param {module:echats/coord/Axis} axis
* @param {module:echarts/model/Model} tickModel For example, can be axisTick, splitLine, splitArea.
* @return {Object} {
* ticks: Array.<number>
* tickCategoryInterval: number
* }
*/
function createAxisTicks(axis, tickModel) {
// Only ordinal scale support tick interval
return axis.type === 'category' ? makeCategoryTicks(axis, tickModel) : {
ticks: axis.scale.getTicks()
};
}
function makeCategoryLabels(axis) {
var labelModel = axis.getLabelModel();
var result = makeCategoryLabelsActually(axis, labelModel);
return !labelModel.get('show') || axis.scale.isBlank() ? {
labels: [],
labelCategoryInterval: result.labelCategoryInterval
} : result;
}
function makeCategoryLabelsActually(axis, labelModel) {
var labelsCache = getListCache(axis, 'labels');
var optionLabelInterval = getOptionCategoryInterval(labelModel);
var result = listCacheGet(labelsCache, optionLabelInterval);
if (result) {
return result;
}
var labels;
var numericLabelInterval;
if (zrUtil.isFunction(optionLabelInterval)) {
labels = makeLabelsByCustomizedCategoryInterval(axis, optionLabelInterval);
} else {
numericLabelInterval = optionLabelInterval === 'auto' ? makeAutoCategoryInterval(axis) : optionLabelInterval;
labels = makeLabelsByNumericCategoryInterval(axis, numericLabelInterval);
} // Cache to avoid calling interval function repeatly.
return listCacheSet(labelsCache, optionLabelInterval, {
labels: labels,
labelCategoryInterval: numericLabelInterval
});
}
function makeCategoryTicks(axis, tickModel) {
var ticksCache = getListCache(axis, 'ticks');
var optionTickInterval = getOptionCategoryInterval(tickModel);
var result = listCacheGet(ticksCache, optionTickInterval);
if (result) {
return result;
}
var ticks;
var tickCategoryInterval; // Optimize for the case that large category data and no label displayed,
// we should not return all ticks.
if (!tickModel.get('show') || axis.scale.isBlank()) {
ticks = [];
}
if (zrUtil.isFunction(optionTickInterval)) {
ticks = makeLabelsByCustomizedCategoryInterval(axis, optionTickInterval, true);
} // Always use label interval by default despite label show. Consider this
// scenario, Use multiple grid with the xAxis sync, and only one xAxis shows
// labels. `splitLine` and `axisTick` should be consistent in this case.
else if (optionTickInterval === 'auto') {
var labelsResult = makeCategoryLabelsActually(axis, axis.getLabelModel());
tickCategoryInterval = labelsResult.labelCategoryInterval;
ticks = zrUtil.map(labelsResult.labels, function (labelItem) {
return labelItem.tickValue;
});
} else {
tickCategoryInterval = optionTickInterval;
ticks = makeLabelsByNumericCategoryInterval(axis, tickCategoryInterval, true);
} // Cache to avoid calling interval function repeatly.
return listCacheSet(ticksCache, optionTickInterval, {
ticks: ticks,
tickCategoryInterval: tickCategoryInterval
});
}
function makeRealNumberLabels(axis) {
var ticks = axis.scale.getTicks();
var labelFormatter = makeLabelFormatter(axis);
return {
labels: zrUtil.map(ticks, function (tickValue, idx) {
return {
formattedLabel: labelFormatter(tickValue, idx),
rawLabel: axis.scale.getLabel(tickValue),
tickValue: tickValue
};
})
};
} // Large category data calculation is performence sensitive, and ticks and label
// probably be fetched by multiple times. So we cache the result.
// axis is created each time during a ec process, so we do not need to clear cache.
function getListCache(axis, prop) {
// Because key can be funciton, and cache size always be small, we use array cache.
return inner(axis)[prop] || (inner(axis)[prop] = []);
}
function listCacheGet(cache, key) {
for (var i = 0; i < cache.length; i++) {
if (cache[i].key === key) {
return cache[i].value;
}
}
}
function listCacheSet(cache, key, value) {
cache.push({
key: key,
value: value
});
return value;
}
function makeAutoCategoryInterval(axis) {
var result = inner(axis).autoInterval;
return result != null ? result : inner(axis).autoInterval = axis.calculateCategoryInterval();
}
/**
* Calculate interval for category axis ticks and labels.
* To get precise result, at least one of `getRotate` and `isHorizontal`
* should be implemented in axis.
*/
function calculateCategoryInterval(axis) {
var params = fetchAutoCategoryIntervalCalculationParams(axis);
var labelFormatter = makeLabelFormatter(axis);
var rotation = (params.axisRotate - params.labelRotate) / 180 * Math.PI;
var ordinalScale = axis.scale;
var ordinalExtent = ordinalScale.getExtent(); // Providing this method is for optimization:
// avoid generating a long array by `getTicks`
// in large category data case.
var tickCount = ordinalScale.count();
if (ordinalExtent[1] - ordinalExtent[0] < 1) {
return 0;
}
var step = 1; // Simple optimization. Empirical value: tick count should less than 40.
if (tickCount > 40) {
step = Math.max(1, Math.floor(tickCount / 40));
}
var tickValue = ordinalExtent[0];
var unitSpan = axis.dataToCoord(tickValue + 1) - axis.dataToCoord(tickValue);
var unitW = Math.abs(unitSpan * Math.cos(rotation));
var unitH = Math.abs(unitSpan * Math.sin(rotation));
var maxW = 0;
var maxH = 0; // Caution: Performance sensitive for large category data.
// Consider dataZoom, we should make appropriate step to avoid O(n) loop.
for (; tickValue <= ordinalExtent[1]; tickValue += step) {
var width = 0;
var height = 0; // Not precise, do not consider align and vertical align
// and each distance from axis line yet.
var rect = textContain.getBoundingRect(labelFormatter(tickValue), params.font, 'center', 'top'); // Magic number
width = rect.width * 1.3;
height = rect.height * 1.3; // Min size, void long loop.
maxW = Math.max(maxW, width, 7);
maxH = Math.max(maxH, height, 7);
}
var dw = maxW / unitW;
var dh = maxH / unitH; // 0/0 is NaN, 1/0 is Infinity.
isNaN(dw) && (dw = Infinity);
isNaN(dh) && (dh = Infinity);
var interval = Math.max(0, Math.floor(Math.min(dw, dh)));
var cache = inner(axis.model);
var axisExtent = axis.getExtent();
var lastAutoInterval = cache.lastAutoInterval;
var lastTickCount = cache.lastTickCount; // Use cache to keep interval stable while moving zoom window,
// otherwise the calculated interval might jitter when the zoom
// window size is close to the interval-changing size.
// For example, if all of the axis labels are `a, b, c, d, e, f, g`.
// The jitter will cause that sometimes the displayed labels are
// `a, d, g` (interval: 2) sometimes `a, c, e`(interval: 1).
if (lastAutoInterval != null && lastTickCount != null && Math.abs(lastAutoInterval - interval) <= 1 && Math.abs(lastTickCount - tickCount) <= 1 // Always choose the bigger one, otherwise the critical
// point is not the same when zooming in or zooming out.
&& lastAutoInterval > interval // If the axis change is caused by chart resize, the cache should not
// be used. Otherwise some hiden labels might not be shown again.
&& cache.axisExtend0 === axisExtent[0] && cache.axisExtend1 === axisExtent[1]) {
interval = lastAutoInterval;
} // Only update cache if cache not used, otherwise the
// changing of interval is too insensitive.
else {
cache.lastTickCount = tickCount;
cache.lastAutoInterval = interval;
cache.axisExtend0 = axisExtent[0];
cache.axisExtend1 = axisExtent[1];
}
return interval;
}
function fetchAutoCategoryIntervalCalculationParams(axis) {
var labelModel = axis.getLabelModel();
return {
axisRotate: axis.getRotate ? axis.getRotate() : axis.isHorizontal && !axis.isHorizontal() ? 90 : 0,
labelRotate: labelModel.get('rotate') || 0,
font: labelModel.getFont()
};
}
function makeLabelsByNumericCategoryInterval(axis, categoryInterval, onlyTick) {
var labelFormatter = makeLabelFormatter(axis);
var ordinalScale = axis.scale;
var ordinalExtent = ordinalScale.getExtent();
var labelModel = axis.getLabelModel();
var result = []; // TODO: axisType: ordinalTime, pick the tick from each month/day/year/...
var step = Math.max((categoryInterval || 0) + 1, 1);
var startTick = ordinalExtent[0];
var tickCount = ordinalScale.count(); // Calculate start tick based on zero if possible to keep label consistent
// while zooming and moving while interval > 0. Otherwise the selection
// of displayable ticks and symbols probably keep changing.
// 3 is empirical value.
if (startTick !== 0 && step > 1 && tickCount / step > 2) {
startTick = Math.round(Math.ceil(startTick / step) * step);
} // (1) Only add min max label here but leave overlap checking
// to render stage, which also ensure the returned list
// suitable for splitLine and splitArea rendering.
// (2) Scales except category always contain min max label so
// do not need to perform this process.
var showAllLabel = shouldShowAllLabels(axis);
var includeMinLabel = labelModel.get('showMinLabel') || showAllLabel;
var includeMaxLabel = labelModel.get('showMaxLabel') || showAllLabel;
if (includeMinLabel && startTick !== ordinalExtent[0]) {
addItem(ordinalExtent[0]);
} // Optimize: avoid generating large array by `ordinalScale.getTicks()`.
var tickValue = startTick;
for (; tickValue <= ordinalExtent[1]; tickValue += step) {
addItem(tickValue);
}
if (includeMaxLabel && tickValue - step !== ordinalExtent[1]) {
addItem(ordinalExtent[1]);
}
function addItem(tVal) {
result.push(onlyTick ? tVal : {
formattedLabel: labelFormatter(tVal),
rawLabel: ordinalScale.getLabel(tVal),
tickValue: tVal
});
}
return result;
} // When interval is function, the result `false` means ignore the tick.
// It is time consuming for large category data.
function makeLabelsByCustomizedCategoryInterval(axis, categoryInterval, onlyTick) {
var ordinalScale = axis.scale;
var labelFormatter = makeLabelFormatter(axis);
var result = [];
zrUtil.each(ordinalScale.getTicks(), function (tickValue) {
var rawLabel = ordinalScale.getLabel(tickValue);
if (categoryInterval(tickValue, rawLabel)) {
result.push(onlyTick ? tickValue : {
formattedLabel: labelFormatter(tickValue),
rawLabel: rawLabel,
tickValue: tickValue
});
}
});
return result;
}
exports.createAxisLabels = createAxisLabels;
exports.createAxisTicks = createAxisTicks;
exports.calculateCategoryInterval = calculateCategoryInterval;