@netdata/charts/dist/es6/components/groupBoxes/drawBoxes.js

Netdata frontend SDK and chart utilities

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import { scaleLinear } from "d3-scale";
import { unstable_shouldYield as shouldYield } from "scheduler";
import { copyCanvas, createCanvas } from "../../helpers/canvas";
import { getCellBoxSize, getRows, getColumns, getXPosition, getYPosition, getFullWidth, getFullHeight } from "./utilities";
import registerEvents from "./events";
export var getWidth = function getWidth(dimensions) {
  var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
    aspectRatio = _ref.aspectRatio,
    cellSize = _ref.cellSize;
  var rows = getRows(dimensions, aspectRatio);
  var columns = getColumns(rows, aspectRatio);
  return getFullWidth(columns, cellSize);
};
var getCanvasAttributes = function getCanvasAttributes(dimensions) {
  var _ref2 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
    aspectRatio = _ref2.aspectRatio,
    cellSize = _ref2.cellSize,
    padding = _ref2.padding;
  var rows = getRows(dimensions, aspectRatio);
  var columns = getColumns(rows, aspectRatio);
  var width = getFullWidth(columns, cellSize);
  var height = getFullHeight(rows, cellSize, padding);
  return {
    width: width,
    height: height,
    columns: Math.ceil(columns)
  };
};
export var makeGetColor = function makeGetColor(min, max, colorRange) {
  return scaleLinear().domain([min, max]).range(colorRange);
};
export default (function (chart, el, _ref3) {
  var _marked = /*#__PURE__*/_regeneratorRuntime().mark(update);
  var onMouseenter = _ref3.onMouseenter,
    onMouseout = _ref3.onMouseout;
  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  var cellSize = options.cellSize,
    cellPadding = options.cellPadding,
    _options$cellStroke = options.cellStroke,
    cellStroke = _options$cellStroke === void 0 ? 2 : _options$cellStroke,
    _options$lineWidth = options.lineWidth,
    lineWidth = _options$lineWidth === void 0 ? 1 : _options$lineWidth,
    _options$colorRange = options.colorRange,
    colorRange = _options$colorRange === void 0 ? [chart.getThemeAttribute("themeGroupBoxesMin"), chart.getThemeAttribute("themeGroupBoxesMax")] : _options$colorRange;
  var canvas = el.getContext("2d");
  var backgroundEl = createCanvas(canvas.width, canvas.height);
  var backgroundCanvas = backgroundEl.getContext("2d");
  var activeBox = -1;
  var _deactivateBox = function deactivateBox() {};
  var _activateBox = function activateBox() {};
  var clearEvents = function clearEvents() {};
  var clear = function clear() {
    _deactivateBox();
    clearEvents();
    canvas.clearRect(0, 0, el.width, el.height);
    backgroundCanvas.clearRect(0, 0, backgroundEl.width, backgroundEl.height);
  };
  function update(dimensions, pointData) {
    var _getCanvasAttributes, width, height, columns, min, max, getColor, drawBox, index;
    return _regeneratorRuntime().wrap(function update$(_context) {
      while (1) switch (_context.prev = _context.next) {
        case 0:
          _getCanvasAttributes = getCanvasAttributes(dimensions, options), width = _getCanvasAttributes.width, height = _getCanvasAttributes.height, columns = _getCanvasAttributes.columns;
          if (!(!width || !height)) {
            _context.next = 6;
            break;
          }
          if (!shouldYield()) {
            _context.next = 5;
            break;
          }
          _context.next = 5;
          return;
        case 5:
          return _context.abrupt("return");
        case 6:
          backgroundEl.width = parseInt(width);
          backgroundEl.height = parseInt(height);
          backgroundCanvas.clearRect(0, 0, backgroundEl.width, backgroundEl.height);
          min = chart.getAttribute("min");
          max = chart.getAttribute("max");
          getColor = makeGetColor(min, max, colorRange);
          drawBox = function drawBox(ctx, id, index) {
            ctx.beginPath();
            ctx.fillStyle = getColor(chart.getRowDimensionValue(id, pointData));
            var offsetX = getXPosition(columns, index, cellSize);
            var offsetY = getYPosition(columns, index, cellSize);
            if (lineWidth && cellStroke) {
              ctx.clearRect(offsetX - lineWidth, offsetY - lineWidth, getCellBoxSize(cellSize, cellPadding) + cellStroke, getCellBoxSize(cellSize, cellPadding) + cellStroke);
            }
            ctx.fillRect(offsetX, offsetY, getCellBoxSize(cellSize, cellPadding), getCellBoxSize(cellSize, cellPadding));
          };
          index = 0;
        case 14:
          if (!(index < dimensions.length)) {
            _context.next = 22;
            break;
          }
          drawBox(backgroundCanvas, dimensions[index], index);
          if (!shouldYield()) {
            _context.next = 19;
            break;
          }
          _context.next = 19;
          return;
        case 19:
          ++index;
          _context.next = 14;
          break;
        case 22:
          _deactivateBox();
          clearEvents();
          copyCanvas(backgroundEl, el);
          clearEvents = registerEvents(el, columns, dimensions.length, {
            onMouseenter: onMouseenter,
            onMouseout: onMouseout
          }, options);
          _deactivateBox = function deactivateBox() {
            return activeBox !== -1 && drawBox(canvas, dimensions[activeBox], activeBox);
          };
          _activateBox = function activateBox(index) {
            _deactivateBox();
            activeBox = index;
            var offsetX = getXPosition(columns, index, cellSize);
            var offsetY = getYPosition(columns, index, cellSize);
            if (lineWidth && cellStroke) {
              canvas.lineWidth = lineWidth;
              canvas.strokeStyle = "#fff";
              canvas.strokeRect(offsetX + lineWidth, offsetY + lineWidth, getCellBoxSize(cellSize, cellPadding) - cellStroke, getCellBoxSize(cellSize, cellPadding) - cellStroke);
            }
          };
        case 28:
        case "end":
          return _context.stop();
      }
    }, _marked);
  }
  return {
    clear: clear,
    update: update,
    activateBox: function activateBox(index) {
      return _activateBox(index);
    },
    deactivateBox: function deactivateBox() {
      return _deactivateBox();
    },
    getElement: function getElement() {
      return backgroundEl;
    }
  };
});