X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fgui%2Fcolour%2FPointColourer.java;fp=src%2Ftim%2Fprune%2Fgui%2Fcolour%2FPointColourer.java;h=27e658c8a9839b385a041f8020608d04750fa1a0;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/gui/colour/PointColourer.java b/src/tim/prune/gui/colour/PointColourer.java
new file mode 100644
index 0000000..27e658c
--- /dev/null
+++ b/src/tim/prune/gui/colour/PointColourer.java
@@ -0,0 +1,119 @@
+package tim.prune.gui.colour;
+
+import java.awt.Color;
+
+import tim.prune.data.TrackInfo;
+
+/**
+ * Abstract class to do the colouring of points,
+ * that is holding a colour for each track point
+ * in the current track
+ */
+public abstract class PointColourer
+{
+	/** default colour */
+	private Color _defaultColour = Color.BLUE;
+	/** start and end colours */
+	private Color _startColour = null, _endColour = null;
+	/** max number of unique colours before wrapping */
+	private int _maxColours = 1;
+
+
+	/**
+	 * Constructor
+	 * @param inStartColour start colour
+	 * @param inEndColour end colour
+	 * @param inMaxColours max number of colours
+	 */
+	public PointColourer(Color inStartColour, Color inEndColour, int inMaxColours)
+	{
+		_startColour = inStartColour;
+		_endColour   = inEndColour;
+		_maxColours  = inMaxColours;
+	}
+
+	/**
+	 * Constructor
+	 * @param inStartColour start colour
+	 * @param inEndColour end colour
+	 */
+	public PointColourer(Color inStartColour, Color inEndColour)
+	{
+		this(inStartColour, inEndColour, -1);
+	}
+
+	/**
+	 * Calculate the colours for each of the points in the given track
+	 * @param inTrackInfo track info object
+	 */
+	public abstract void calculateColours(TrackInfo inTrackInfo);
+
+	/**
+	 * Get the colour for the given point index
+	 * @param inPointIndex index of point in track
+	 * @return colour object
+	 */
+	public Color getColour(int inPointIndex)
+	{
+		return _defaultColour;
+	}
+
+	/**
+	 * @param inColor default colour to use
+	 */
+	protected void setDefaultColour(Color inColour)
+	{
+		if (inColour != null) {
+			_defaultColour = inColour;
+		}
+	}
+
+	/**
+	 * @return default colour
+	 */
+	protected Color getDefaultColour() {
+		return _defaultColour;
+	}
+
+	/**
+	 * @return start colour
+	 */
+	protected Color getStartColour() {
+		return _startColour;
+	}
+
+	/**
+	 * @return end colour
+	 */
+	protected Color getEndColour() {
+		return _endColour;
+	}
+
+	/**
+	 * @return maximum number of colours, or -1
+	 */
+	protected int getMaxColours() {
+		return _maxColours;
+	}
+
+	/**
+	 * Mix the given colours together using HSB values instead of interpolating RGB
+	 * @param inFraction between 0.0 (start) and 1.0 (end)
+	 * @return mixed colour
+	 */
+	protected Color mixColour(float inFraction)
+	{
+		if (_startColour == null && _endColour == null) return getDefaultColour();
+		if (_startColour == null) return _endColour;
+		if (_endColour == null || inFraction < 0.0 || inFraction > 1.0) return _startColour;
+
+		// Convert both colours to hsb, and interpolate
+		float[] startHSB = Color.RGBtoHSB(_startColour.getRed(), _startColour.getGreen(), _startColour.getBlue(), null);
+		float[] endHSB = Color.RGBtoHSB(_endColour.getRed(), _endColour.getGreen(), _endColour.getBlue(), null);
+		// Note that if end hue is less than start hue, hue will go backwards rather than forwards with wrap around 0
+
+		return Color.getHSBColor(startHSB[0] + (endHSB[0]-startHSB[0]) * inFraction,
+			startHSB[1] + (endHSB[1]-startHSB[1]) * inFraction,
+			startHSB[2] + (endHSB[2]-startHSB[2]) * inFraction);
+	}
+}