@devexperts/dxcharts-lite
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JavaScript
/*
* Copyright (C) 2019 - 2026 Devexperts Solutions IE Limited
* This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
* If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
import { clipToBounds } from '../utils/canvas/canvas-drawing-functions.utils';
import { isEmpty } from '../utils/object.utils';
export const transformToTwoDimension = (points) => (Array.isArray(points[0]) ? points : [points]);
/**
* Basic data series drawer.
* Have multiple paint tools: linear, histogram, points, text above/below candle and others.
*
* (may support multiple layers in future)
*/
export class DataSeriesDrawer {
constructor(paneManager, seriesDrawers) {
this.paneManager = paneManager;
this.seriesDrawers = seriesDrawers;
}
draw(canvasModel, model, paneUUID) {
const ctx = canvasModel.ctx;
const pane = paneUUID && this.paneManager.panes[paneUUID];
if (model) {
ctx.save();
pane && clipToBounds(ctx, pane.getBounds());
this.drawSeries(ctx, model);
ctx.restore();
}
}
drawSeries(ctx, series) {
const visibilityPredicates = series.config.additionalVisibilityPredicatesMap;
if (series.config.visible || (visibilityPredicates && !isEmpty(visibilityPredicates))) {
const paintTool = series.config.type;
const drawer = this.seriesDrawers[paintTool];
if (drawer) {
const viewportSeries = series.getSeriesInViewport(series.scale.xStart - 1, series.scale.xEnd + 1);
if (viewportSeries && viewportSeries.length >= 1) {
// +- 1 to correctly draw points which are partly inside bounds
drawer.draw(ctx, viewportSeries, series, {});
}
}
else {
console.error(`Data series drawer with type ${paintTool} isn't registered!`);
}
}
}
}
export const setLineWidth = (ctx, lineWidth, dataSeries, hitTestDrawerConfig, seriesSelectedWidth = lineWidth) => {
if (hitTestDrawerConfig.hoverWidth) {
ctx.lineWidth = hitTestDrawerConfig.hoverWidth;
}
else if (dataSeries.highlighted) {
ctx.lineWidth = lineWidth !== seriesSelectedWidth ? lineWidth + 1 : seriesSelectedWidth;
}
else {
ctx.lineWidth = lineWidth;
}
};