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package tim.prune.gui.map;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JPanel;
import tim.prune.I18nManager;
import tim.prune.config.ColourScheme;
import tim.prune.config.Config;
/**
* Class to show a scale bar on the main map of Prune
*/
public class ScaleBar extends JPanel
{
/** zoom level */
private int _zoomLevel = -1;
/** y tile number */
private int _yTile = -1;
// Dimensions
/** Offset from left side in pixels */
private static final int LEFT_OFFSET = 20;
/** Offset from top in pixels */
private static final int Y_OFFSET = 10;
/** Tick height in pixels */
private static final int TICK_HEIGHT = 5;
/** Margin between bar and end text in pixels */
private static final int MARGIN_WIDTH = 8;
/** metric scales for each zoom level */
private static final int[] _metricScales = {10000, 5000, 2000, 2000, 1000, 500, 200, 100,
50, 20, 10, 5, 2, 2, 1, -2, -5, -10, -20, -50, -100, -200};
/** pixel counts for each zoom level (metric) */
private static final int[] _metricPixels = {64, 64, 51, 102, 102, 102, 81, 81,
81, 65, 65, 65, 52, 105, 105, 105, 83, 83, 83, 67, 67, 67};
/** imperial scales for each zoom level (num miles) */
private static final int[] _mileScales = {10000, 10000, 5000, 2000, 2000, 1000, 500, 200,
100, 50, 20, 10, 5, 2, 1, -2, -2, -5, -10, -20, -50, -100};
/** pixel counts for each zoom level (miles) */
private static final int[] _milePixels = {79, 79, 79, 64, 127, 127, 127, 102,
102, 102, 81, 81, 81, 65, 65, 65, 130, 104, 104, 104, 104, 83, 83};
/**
* Constructor
*/
public ScaleBar()
{
super();
setOpaque(false);
setPreferredSize(new Dimension(100, 20));
}
/**
* Paint method to override display
* @param inG graphics object
*/
public void paint(Graphics inG)
{
super.paint(inG);
if (_zoomLevel > -1)
{
try {
boolean useMetric = Config.getConfigBoolean(Config.KEY_METRIC_UNITS);
int rightSide = LEFT_OFFSET + (useMetric?_metricPixels[_zoomLevel]:_milePixels[_zoomLevel]);
int scale = (useMetric?_metricScales[_zoomLevel]:_mileScales[_zoomLevel]);
// work out cos(latitude) from y tile and zoom, and apply to scale
final double n = Math.pow(2, _zoomLevel);
final double angle = Math.PI * (1 - 2.0*_yTile/n);
final double lat = Math.atan(Math.sinh(angle));
final double cosLat = Math.cos(lat);
rightSide = (int) (rightSide / cosLat);
// Adjust if scale is too large
while (rightSide > 300)
{
rightSide /= 2;
scale /= 2;
// Abort if scale is now less than 1 unit (shouldn't ever be)
if (scale < 1) {return;}
}
// Determine colours to use
Color barColour = Config.getColourScheme().getColour(ColourScheme.IDX_TEXT);
Color blankColour = new Color(255-barColour.getRed(), 255-barColour.getGreen(), 255-barColour.getBlue());
// Should this blank colour be set to saturation zero?
// Draw blank bars behind
inG.setColor(blankColour);
inG.drawLine(LEFT_OFFSET, Y_OFFSET-1, rightSide+2, Y_OFFSET-1);
inG.drawLine(LEFT_OFFSET, Y_OFFSET+2, rightSide+2, Y_OFFSET+2);
inG.drawLine(LEFT_OFFSET-1, Y_OFFSET+2, LEFT_OFFSET-1, Y_OFFSET-TICK_HEIGHT);
inG.drawLine(LEFT_OFFSET+2, Y_OFFSET+2, LEFT_OFFSET+2, Y_OFFSET-TICK_HEIGHT);
inG.drawLine(rightSide-1, Y_OFFSET+2, rightSide-1, Y_OFFSET-TICK_HEIGHT);
inG.drawLine(rightSide+2, Y_OFFSET+2, rightSide+2, Y_OFFSET-TICK_HEIGHT);
// horizontal
inG.setColor(barColour);
inG.drawLine(LEFT_OFFSET, Y_OFFSET, rightSide, Y_OFFSET);
inG.drawLine(LEFT_OFFSET, Y_OFFSET+1, rightSide, Y_OFFSET+1);
// 0 tick
inG.drawLine(LEFT_OFFSET, Y_OFFSET, LEFT_OFFSET, Y_OFFSET-TICK_HEIGHT);
inG.drawLine(LEFT_OFFSET+1, Y_OFFSET, LEFT_OFFSET+1, Y_OFFSET-TICK_HEIGHT);
// end tick
inG.drawLine(rightSide, Y_OFFSET+1, rightSide, Y_OFFSET-TICK_HEIGHT);
inG.drawLine(rightSide+1, Y_OFFSET+1, rightSide+1, Y_OFFSET-TICK_HEIGHT);
// text
String text = (scale>0?(""+scale):("1/"+(-scale))) + " "
+ I18nManager.getText(useMetric?"units.kilometres.short":"units.miles.short");
inG.setColor(blankColour);
inG.drawString(text, rightSide+MARGIN_WIDTH-1, Y_OFFSET);
inG.drawString(text, rightSide+MARGIN_WIDTH+1, Y_OFFSET);
inG.drawString(text, rightSide+MARGIN_WIDTH, Y_OFFSET-1);
inG.drawString(text, rightSide+MARGIN_WIDTH, Y_OFFSET+1);
inG.setColor(barColour);
inG.drawString(text, rightSide+MARGIN_WIDTH, Y_OFFSET);
}
catch (ArrayIndexOutOfBoundsException ai) {}
}
}
/**
* Update the scale level
* @param inZoom new zoom level
*/
public void updateScale(int inZoom, int inYtile)
{
_zoomLevel = inZoom;
_yTile = inYtile;
}
}
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