org.locationtech.udig.mapgraphic.scale.ScaleDenomMapGraphic.java Source code

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Here is the source code for org.locationtech.udig.mapgraphic.scale.ScaleDenomMapGraphic.java

Source

/*
 *    uDig - User Friendly Desktop Internet GIS client
 *    http://udig.refractions.net
 *    (C) 2012, Refractions Research Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
 * License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
 */
package org.locationtech.udig.mapgraphic.scale;

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.text.NumberFormat;

import org.apache.commons.lang.StringUtils;

import org.locationtech.udig.mapgraphic.MapGraphic;
import org.locationtech.udig.mapgraphic.MapGraphicContext;
import org.locationtech.udig.mapgraphic.style.FontStyle;
import org.locationtech.udig.mapgraphic.style.FontStyleContent;
import org.locationtech.udig.mapgraphic.style.LocationStyleContent;
import org.locationtech.udig.project.IBlackboard;
import org.locationtech.udig.project.IStyleBlackboard;
import org.locationtech.udig.ui.graphics.ViewportGraphics;

/**
 * A mapgraphic that display the map scale in the format
 * "1:X"
 * 
 * Available styles include: Font, Location, ScaleDenomStyle
 * 
 * @author Emily
 *
 */
public class ScaleDenomMapGraphic implements MapGraphic {

    private static NumberFormat NUMBER_FORMAT = NumberFormat.getInstance();
    static {
        NUMBER_FORMAT.setMaximumFractionDigits(0);
    }

    public ScaleDenomMapGraphic() {

    }

    public void draw(MapGraphicContext context) {

        ViewportGraphics g = context.getGraphics();
        IBlackboard mapblackboard = context.getMap().getBlackboard();

        double scaleDenom = context.getViewportModel().getScaleDenominator();

        // scale may be set by printing engine
        Object value = mapblackboard.get("scale"); //$NON-NLS-1$

        if (value != null && value instanceof Double) {
            scaleDenom = ((Double) value).doubleValue();
        }
        FontStyle fs = getFontStyle(context);
        g.setFont(fs.getFont());

        Point loc = getGraphicLocation(context);

        ScaleDenomStyle background = getStyle(context);

        String denomStr = NUMBER_FORMAT.format(scaleDenom);
        String str = "1:" + denomStr; //$NON-NLS-1$
        //check if a prefix is provided
        if (StringUtils.trimToNull(background.getLabel()) != null) {
            str = background.getLabel() + " " + str;
        }
        Rectangle2D bnds = g.getStringBounds(str);

        int x = loc.x;
        int y = loc.y;

        if (x < 0) {
            x = context.getMapDisplay().getWidth() + x - (int) bnds.getWidth();
        }
        if (y < 0) {
            y = context.getMapDisplay().getHeight() + y - (int) bnds.getHeight();
        }

        //draw rectangle      
        if (background.getColor() != null) {
            context.getGraphics().setColor(background.getColor());
            g.fillRect(x - 2, y - 2, (int) bnds.getWidth() + 4, (int) bnds.getHeight() + 4);
        }

        g.setColor(fs.getColor());
        g.drawString(str, x + (int) bnds.getWidth() / 2, y + (g.getFontHeight() - g.getFontAscent()),
                ViewportGraphics.ALIGN_MIDDLE, ViewportGraphics.ALIGN_MIDDLE);

    }

    private ScaleDenomStyle getStyle(MapGraphicContext context) {
        IStyleBlackboard styleBlackboard = context.getLayer().getStyleBlackboard();
        ScaleDenomStyle style = (ScaleDenomStyle) styleBlackboard.get(ScaleDenomStyleContent.ID);

        if (style == null) {
            style = new ScaleDenomStyle();
            styleBlackboard.put(ScaleDenomStyleContent.ID, style);
        }
        return style;
    }

    private Point getGraphicLocation(MapGraphicContext context) {
        IStyleBlackboard styleBlackboard = context.getLayer().getStyleBlackboard();

        Rectangle r = (Rectangle) styleBlackboard.get(LocationStyleContent.ID);
        if (r == null) {
            r = LocationStyleContent.createDefaultStyle();
        }
        Point point = new Point(r.x, r.y);
        return point;
    }

    private FontStyle getFontStyle(MapGraphicContext context) {
        IStyleBlackboard styleBlackboard = context.getLayer().getStyleBlackboard();
        FontStyle style = (FontStyle) styleBlackboard.get(FontStyleContent.ID);
        if (style == null) {
            style = new FontStyle();
            styleBlackboard.put(FontStyleContent.ID, style);
        }
        return style;
    }

}