eu.limetri.client.mapviewer.swing.render.LineDrawingRenderer Maven / Gradle / Ivy

Go to download
/**
 *  Copyright (C) 2008-2013 LimeTri. All rights reserved.
 *
 *  AgroSense is free software: you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free Software
 *  Foundation, either version 3 of the License, or (at your option) any later
 *  version.
 *
 *  There are special exceptions to the terms and conditions of the GPLv3 as it
 *  is applied to this software, see the FLOSS License Exception
 *  .
 *
 *  AgroSense is distributed in the hope that it will be useful, but WITHOUT ANY
 *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 *  A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 *  AgroSense. If not, see .
 */
package eu.limetri.client.mapviewer.swing.render;

import com.vividsolutions.jts.geom.Coordinate;
import eu.limetri.client.mapviewer.data.GeoPosition;
import eu.limetri.client.mapviewer.data.util.ScaleUtil;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import java.util.List;

/**
 *
 * @author Frantisek Post
 */
public class LineDrawingRenderer implements DrawingRenderer {

    private final List coords;
    private int lastCalculatedCount = 0;
    private double[] lengths;

    public LineDrawingRenderer(List coords) {
        this.coords = coords;
    }

    @Override
    public void render(Graphics2D g, Rectangle canvas, GeoTranslator translator) {
        if (coords == null || coords.isEmpty()) {
            return;
        }

        int len = coords.size();
        int xs[] = new int[len];
        int ys[] = new int[len];

        // TODO: calculate bounding box, 
        // no problems yet since the currently used translator doesn't need it.

        for (int i = 0; i < len; i++) {
            GeoPosition geo = coords.get(i);
            Point2D point = translator.geoToPixel(canvas, null, new Coordinate(geo.getLongitude(), geo.getLatitude()));
            xs[i] = (int) (point.getX() - canvas.x);
            ys[i] = (int) (point.getY() - canvas.y);
        }

        if (len >= 2) {
            renderEdges(g, xs, ys);
        }
        renderPoints(g, xs, ys);
        renderLengthValues(g, xs, ys);
    }

    private void renderPoints(Graphics2D g, int[] xs, int[] ys) {
        int len = xs.length;

        g.setColor(Color.DARK_GRAY);
        for (int i = 0; i < len - 1; i++) {
            g.fillRect(xs[i] - 1, ys[i] - 1, 3, 3);
        }
        // alt. style for last point:
        g.setColor(Color.YELLOW);
        g.fillRect(xs[len - 1] - 1, ys[len - 1] - 1, 3, 3);
    }

    //shape outline except for connection from last to first point.
    private void renderEdges(Graphics2D g, int[] xs, int[] ys) {
        g.setColor(Color.RED);
        g.drawPolyline(xs, ys, xs.length);
    }
    
    private void renderLengthValues(Graphics2D g, int[] xs, int[] ys) {
        int count = xs.length;
        if (count != lastCalculatedCount) {
            if (count > 1) {
                lengths= new double[count-1];
                for (int i = 0; i < count-1; i++) {
                    lengths[i] = coords.get(i).distanceTo(coords.get(i+1));
                }
            }
            lastCalculatedCount = count;
        }

        g.setColor(Color.BLACK);
        for (int i = 0; i < count - 1; i++) {
            int x = (xs[i] + xs[i+1]) / 2;
            int y = (ys[i] + ys[i+1]) / 2;
            
            g.drawString(ScaleUtil.formatLength(lengths[i]), x, y);
        }
        
    }
    
}