svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.symbology / org.gvsig.symbology.lib / org.gvsig.symbology.lib.impl / src / main / java / org / gvsig / symbology / fmap / mapcontext / rendering / symbol / impl / CartographicSupportToolkit.java @ 40560
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1 | 40560 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | 40435 | jjdelcerro | *
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4 | 40560 | jjdelcerro | * Copyright (C) 2007-2013 gvSIG Association.
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5 | 40435 | jjdelcerro | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | 40560 | jjdelcerro | * as published by the Free Software Foundation; either version 3
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9 | 40435 | jjdelcerro | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | 40560 | jjdelcerro | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | 40435 | jjdelcerro | *
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21 | 40560 | jjdelcerro | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | 40435 | jjdelcerro | */
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24 | package org.gvsig.symbology.fmap.mapcontext.rendering.symbol.impl; |
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25 | |||
26 | import org.gvsig.fmap.mapcontext.MapContext; |
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27 | import org.gvsig.fmap.mapcontext.ViewPort; |
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28 | import org.gvsig.fmap.mapcontext.rendering.symbols.CartographicSupport; |
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29 | |||
30 | |||
31 | |||
32 | /**
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33 | * @author jaume dominguez faus - jaume.dominguez@iver.es
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34 | */
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35 | public class CartographicSupportToolkit { |
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36 | |||
37 | /**
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38 | * Calculates the distance in pixels corresponding to the provided length,
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39 | * according to the current rendering context (output dpi, map scale, map units) and the
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40 | * symbol cartographic settings (unit, size, and unit reference system).
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41 | *
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42 | * @param cartographicElement CartographicSupport object which contains the reference system
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43 | * and the measuring units for the provided length
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44 | * @param length The length to be computed in pixels. The length is supposed to be
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45 | * provided in the units defined in the cartographicElement
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46 | * @param viewPort The viewport, which defines the relationship between pixels and maps units
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47 | * @param dpi The resolution (dots per inch) of the target display device
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48 | * (printer, screen, etc)
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49 | * @return The distance in pixels corresponding to the provided length
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50 | */
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51 | public static double getCartographicLength(CartographicSupport cartographicElement, double length, ViewPort viewPort, double dpi) { |
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52 | int unit = cartographicElement.getUnit();
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53 | double lengthInPixel = length;
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54 | |||
55 | if (unit != -1) { |
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56 | double[] trans2Meter=MapContext.getDistanceTrans2Meter(); |
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57 | if (cartographicElement.getReferenceSystem() == CartographicSupport.WORLD) {
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58 | double dist1PixelInMeters = viewPort.getDist1pixel()*trans2Meter[viewPort.getMapUnits()];
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59 | double realWidthMeter = length*trans2Meter[unit];
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60 | lengthInPixel = realWidthMeter/dist1PixelInMeters; |
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61 | } else if (cartographicElement.getReferenceSystem() == CartographicSupport.PAPER) { |
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62 | double lengthInInches = 1/trans2Meter[7]*trans2Meter[unit]*length; |
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63 | lengthInPixel = lengthInInches*dpi; |
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64 | } |
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65 | } else{
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66 | double scale=dpi/72; |
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67 | lengthInPixel=lengthInPixel*scale; |
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68 | } |
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69 | return (lengthInPixel);
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70 | |||
71 | } |
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72 | |||
73 | /**
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74 | * The unit that will be used when creating new symbols.<br>
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75 | * <b>Factory defaults to pixel.</b>
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76 | */
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77 | public static int DefaultMeasureUnit = -1; |
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78 | /**
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79 | * The reference system that will be used when creating new symbols.<br>
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80 | * <b>Factory defaults to pixel.</b>
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81 | */
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82 | public static int DefaultReferenceSystem = CartographicSupport.WORLD; |
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83 | |||
84 | } |
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85 |