CrosshairState
org.jfree.chart.plot

Class CrosshairState

  • Direct Known Subclasses:
    CategoryCrosshairState, XYCrosshairState


    public class CrosshairStateextends Object
    Maintains state information about crosshairs on a plot between successive calls to the renderer's draw method. This class is used internally by JFreeChart - it is not intended for external use.
    • Constructor Detail

      • CrosshairState

        public CrosshairState()
        Creates a new CrosshairState instance that calculates distance in Java2D space.
      • CrosshairState

        public CrosshairState(boolean calculateDistanceInDataSpace)
        Creates a new CrosshairState instance.
        Parameters:
        calculateDistanceInDataSpace - a flag that controls whether the distance is calculated in data space or Java2D space.
    • Method Detail

      • getCrosshairDistance

        public double getCrosshairDistance()
        Returns the distance between the anchor point and the current crosshair point.
        Returns:
        The distance.
        See Also:
        setCrosshairDistance(double)
      • setCrosshairDistance

        public void setCrosshairDistance(double distance)
        Sets the distance between the anchor point and the current crosshair point. As each data point is processed, its distance to the anchor point is compared with this value and, if it is closer, the data point becomes the new crosshair point.
        Parameters:
        distance - the distance.
        See Also:
        getCrosshairDistance()
      • updateCrosshairPoint

        public void updateCrosshairPoint(double x,                        double y,                        double transX,                        double transY,                        PlotOrientation orientation)
        Evaluates a data point and if it is the closest to the anchor point it becomes the new crosshair point.

        To understand this method, you need to know the context in which it will be called. An instance of this class is passed to an XYItemRenderer as each data point is plotted. As the point is plotted, it is passed to this method to see if it should be the new crosshair point.

        Parameters:
        x - x coordinate (measured against the domain axis).
        y - y coordinate (measured against the range axis).
        transX - x translated into Java2D space.
        transY - y translated into Java2D space.
        orientation - the plot orientation.
      • updateCrosshairPoint

        public void updateCrosshairPoint(double x,                        double y,                        int domainAxisIndex,                        int rangeAxisIndex,                        double transX,                        double transY,                        PlotOrientation orientation)
        Evaluates a data point and if it is the closest to the anchor point it becomes the new crosshair point.

        To understand this method, you need to know the context in which it will be called. An instance of this class is passed to an XYItemRenderer as each data point is plotted. As the point is plotted, it is passed to this method to see if it should be the new crosshair point.

        Parameters:
        x - x coordinate (measured against the domain axis).
        y - y coordinate (measured against the range axis).
        domainAxisIndex - the index of the domain axis for this point.
        rangeAxisIndex - the index of the range axis for this point.
        transX - x translated into Java2D space.
        transY - y translated into Java2D space.
        orientation - the plot orientation.
      • updateCrosshairX

        public void updateCrosshairX(double candidateX)
        Deprecated. Use updateCrosshairX(double, int). See bug report 1086307.
        Evaluates an x-value and if it is the closest to the anchor x-value it becomes the new crosshair value.

        Used in cases where only the x-axis is numerical.

        Parameters:
        candidateX - x position of the candidate for the new crosshair point.
      • updateCrosshairX

        public void updateCrosshairX(double candidateX,                    int domainAxisIndex)
        Evaluates an x-value and if it is the closest to the anchor x-value it becomes the new crosshair value.

        Used in cases where only the x-axis is numerical.

        Parameters:
        candidateX - x position of the candidate for the new crosshair point.
        domainAxisIndex - the index of the domain axis for this x-value.
      • updateCrosshairY

        public void updateCrosshairY(double candidateY)
        Deprecated. Use updateCrosshairY(double, int). See bug report 1086307.
        Evaluates a y-value and if it is the closest to the anchor y-value it becomes the new crosshair value.

        Used in cases where only the y-axis is numerical.

        Parameters:
        candidateY - y position of the candidate for the new crosshair point.
      • updateCrosshairY

        public void updateCrosshairY(double candidateY,                    int rangeAxisIndex)
        Evaluates a y-value and if it is the closest to the anchor y-value it becomes the new crosshair value.

        Used in cases where only the y-axis is numerical.

        Parameters:
        candidateY - y position of the candidate for the new crosshair point.
        rangeAxisIndex - the index of the range axis for this y-value.
      • setAnchor

        public void setAnchor(Point2D anchor)
        Sets the anchor point. This is usually the mouse click point in a chart panel, and the crosshair point will often be the data item that is closest to the anchor point.

        Note that the x and y coordinates (in data space) are not updated by this method - the caller is responsible for ensuring that this happens in sync.
        Parameters:
        anchor - the anchor point (null permitted).
        See Also:
        getAnchor()
      • getAnchorX

        public double getAnchorX()
        Returns the x-coordinate (in data space) for the anchor point.
        Returns:
        The x-coordinate of the anchor point.
      • setAnchorX

        public void setAnchorX(double x)
        Sets the x-coordinate (in data space) for the anchor point. Note that this does NOT update the anchor itself - the caller is responsible for ensuring this is done in sync.
        Parameters:
        x - the x-coordinate.
      • getAnchorY

        public double getAnchorY()
        Returns the y-coordinate (in data space) for the anchor point.
        Returns:
        The y-coordinate of teh anchor point.
      • setAnchorY

        public void setAnchorY(double y)
        Sets the y-coordinate (in data space) for the anchor point. Note that this does NOT update the anchor itself - the caller is responsible for ensuring this is done in sync.
        Parameters:
        y - the y-coordinate.
      • getCrosshairX

        public double getCrosshairX()
        Get the x-value for the crosshair point.
        Returns:
        The x position of the crosshair point.
        See Also:
        setCrosshairX(double)
      • getCrosshairY

        public double getCrosshairY()
        Get the y-value for the crosshair point. This is the coordinate in data space measured against the range axis.
        Returns:
        The y position of the crosshair point.
        See Also:
        setCrosshairY(double)
      • getDatasetIndex

        public int getDatasetIndex()
        Returns the dataset index that the crosshair values relate to. The dataset is mapped to specific axes, and this is how the crosshairs are mapped also.
        Returns:
        The dataset index.
        See Also:
        setDatasetIndex(int)
      • setDatasetIndex

        public void setDatasetIndex(int index)
        Sets the dataset index that the current crosshair values relate to.
        Parameters:
        index - the dataset index.
        See Also:
        getDatasetIndex()
      • getDomainAxisIndex

        public int getDomainAxisIndex()
        Deprecated. As of version 1.0.11, the domain axis should be determined using the dataset index.
        Returns the domain axis index for the crosshair x-value.
        Returns:
        The domain axis index.
      • getRangeAxisIndex

        public int getRangeAxisIndex()
        Deprecated. As of version 1.0.11, the domain axis should be determined using the dataset index.
        Returns the range axis index for the crosshair y-value.
        Returns:
        The range axis index.

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