px-vis-behavior-interaction.html

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you may not use this file except in compliance with the License.
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    http://www.apache.org/licenses/LICENSE-2.0

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See the License for the specific language governing permissions and
limitations under the License.
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<script>
var PxVisBehaviorInteraction = window.PxVisBehaviorInteraction = (window.PxVisBehaviorInteraction || {});

/*
    Name:
    PxVisBehaviorInteraction.lasso

    Description:
    Polymer behavior that provides the methods and properties necessary
    to handle lasso selection

    @polymerBehavior PxVisBehaviorInteraction.lasso
*/

PxVisBehaviorInteraction.lasso = [{
  properties: {
    _isLassoing: {
      type: Boolean,
      value: false
    },
    _lassoDrawing: {
      type: Object
    },
    _lassoGroup: {
      type: Object
    },
    _lassoCoords: {
      type: Object,
      value: function() {
        return [];
      }
    },
    _lassoCrosshairData: {
      type: Object,
      value: function() {
        return {
          'rawData': [],
          'timeStamps': []
        }
      }
    },
    _lassoGenerator: {
      type: Object
    },
    /**
     * When switched clears all the previous selection made
     * (in _lassoCrosshairData)
     */
    resetLassoData: {
      type: Boolean,
      value: false,
      observer: '_resetLasso'
    },
    lassoType: String
  },

  _resetLasso: function() {
    if(this.hasUndefinedArguments(arguments)) {
      return;
    }

    this._lassoCrosshairData = {
      rawData: [],
      timeStamps: []
    }
  },

  _startLasso: function() {
     //only allow left clicks
    if(Px.d3.event.button === 0) {
      this._calcCrosshair = true;
      this._isLassoing = true;

      //in case the user clicks inside the chart, and mouses out, we are waiting for a mouseup, and closing our action box with the coordinates available on the mouseup.
      Px.d3.select(document).on('mouseup.action', this._stopLasso.bind(this));
      Px.d3.select(document).on('mousemove.action', this._updateLasso.bind(this));

      var mousePos = Px.d3.mouse(this._rect.node());

      this._lassoGenerator = Px.d3.line()
        .x(function(d) { return d[0]; })
        .y(function(d) { return d[1]; });

      this._lassoGroup = this.svg.append('g')
        .attr('class', 'lasso-group');

// TODO Change to box type and lasso type; toolbar selection
// make available to all
      if(this._isTimeType(this.xAxisType) && this.lassoType !== 'freeform') {
        //timeseries lasso will be a box
        if(this.lassoType === 'yRect') {
          const width = Math.max(this.width - this.margin.left - this.margin.right, 0);

          this._lassoCoords.push([0, mousePos[1]], [width, mousePos[1]], [0, mousePos[1]], [width, mousePos[1]], [0, mousePos[1]]);

        } else {
          const _height = Math.max(this.height - this.margin.bottom - this.margin.top,0);

          this._lassoCoords.push([mousePos[0], 0], [mousePos[0], _height], [mousePos[0], 0], [mousePos[0], _height], [mousePos[0], 0]);
        }

      } else {
        //re add start at the end so that our polygon closes
        this._lassoCoords.push([mousePos[0], mousePos[1]], [mousePos[0], mousePos[1]]);
      }

      this._lassoGroup.append('path')
        .attr('class', 'lasso-line')
        .attr('fill', this._checkThemeVariable('--px-vis-zoom-brush-fill-color', 'rgb(0,0,0)'))
        .attr('fill-opacity', this._checkThemeVariable('--px-vis-zoom-brush-fill-opacity', 0.5))
        .attr('stroke', this._checkThemeVariable('--px-vis-zoom-brush-outline-color', 'rgb(0,0,0)'));

      this._calcData();
    }
  },

  _updateLasso: function(first) {

    if(this._isLassoing) {
      var mousePos = Px.d3.mouse(this._rect.node());

      if(this._isTimeType(this.xAxisType) && this.lassoType !== 'freeform') {
        this._updateCoordsTS(mousePos);
      } else if(!this.radial) {
        this._updateCoordsCartesian(mousePos);
      } else {
        this._updateCoordsRadial(mousePos);
      }

      //update drawing
      this._lassoGroup.selectAll('path.lasso-line')
        .attr('d', this._lassoGenerator(this._lassoCoords));

      this._calcData();

    }
  },

  _updateCoordsCartesian: function(mousePos) {
    var result = mousePos,
        _height = Math.max(this.height - this.margin.bottom - this.margin.top,0),
        last = this._lassoCoords.pop();

    result[0] = this._constrainOnWidth(mousePos[0]);
    result[1] = mousePos[1] < 0 ? 0 : mousePos[1];
    result[1] = result[1] > _height ? _height : result[1];

    this._lassoCoords.push(result);
    this._lassoCoords.push(last);
  },

  _updateCoordsRadial: function(mousePos) {
    //width = height = radius
    var result = mousePos,
        squareDist = mousePos[0]*mousePos[0] + mousePos[1]*mousePos[1],
        ratio,
        last = this._lassoCoords.pop();

    //scale back values if we are outside of the circle
    if(squareDist > this.width*this.width) {

      ratio = this.width/Math.sqrt(squareDist);
      result[0] = mousePos[0] * ratio;
      result[1] = mousePos[1] * ratio;
    }

    this._lassoCoords.push(result);
    this._lassoCoords.push(last);
  },

  _updateCoordsTS: function(mousePos) {
    const last = this._lassoCoords.pop();
    let first, second;

    if(this.lassoType === 'yRect') {
      const width = Math.max(this.width - this.margin.left - this.margin.right, 0);
      const newY = this._constrainOnHeight(mousePos[1]);

      first = [width, newY];
      second = [0, newY];
    } else {

      const height = Math.max(this.height - this.margin.bottom - this.margin.top,0);
      const newX = this._constrainOnWidth(mousePos[0]);

      first = [newX, height];
      second = [newX, 0];
    }

    this._lassoCoords.pop();
    this._lassoCoords.pop();
    this._lassoCoords.push(first);
    this._lassoCoords.push(second);
    this._lassoCoords.push(last);
  },

  _constrainOnWidth: function(xVal) {
    var _width = Math.max(this.width - this.margin.left - this.margin.right,0),
        result;

    result = xVal < 0 ? 0 : xVal;
    result = result > _width ? _width : result;

    return result;
  },

  _constrainOnHeight: function(yVal) {
    const height = Math.max(this.height - this.margin.top - this.margin.bottom, 0);
    let result = yVal < 0 ? 0 : yVal;
    result = result > height ? height : result;

    return result;
  },

  _stopLasso: function() {
    this._lassoGroup.remove();
    this._lassoCoords = [];
    this._isLassoing = false;
    this._lassoCrosshairData = this.crosshairData;
  }
}, PxVisBehavior.observerCheck]
</script>