| 1 | package org.openstreetmap.josm.gui.layer;
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| 2 |
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| 3 | import java.awt.Graphics;
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| 4 |
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| 5 | import javax.swing.Icon;
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| 6 |
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| 7 | import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
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| 8 | import org.openstreetmap.josm.data.projection.Projection;
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| 9 | import org.openstreetmap.josm.gui.MapView;
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| 10 |
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| 11 | /**
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| 12 | * A layer encapsulates the gui componente of one dataset and its representation.
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| 13 | *
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| 14 | * Some layers may display data directly importet from OSM server. Other only
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| 15 | * display background images. Some can be edited, some not. Some are static and
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| 16 | * other changes dynamically (auto-updated).
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| 17 | *
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| 18 | * Layers can be visible or not. Most actions the user can do applies only on
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| 19 | * selected layers. The available actions depend on the selected layers too.
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| 20 | *
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| 21 | * All layers are managed by the MapView. They are displayed in a list to the
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| 22 | * right of the screen.
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| 23 | *
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| 24 | * @author imi
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| 25 | */
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| 26 | abstract public class Layer {
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| 27 |
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| 28 | /**
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| 29 | * The visibility state of the layer.
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| 30 | */
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| 31 | public boolean visible = true;
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| 32 | /**
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| 33 | * The name of this layer.
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| 34 | */
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| 35 | public final String name;
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| 36 |
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| 37 | /**
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| 38 | * Create the layer and fill in the necessary components.
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| 39 | */
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| 40 | public Layer(String name) {
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| 41 | this.name = name;
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| 42 | }
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| 43 |
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| 44 | /**
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| 45 | * Paint the dataset using the engine set.
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| 46 | * @param mv The object that can translate GeoPoints to screen coordinates.
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| 47 | */
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| 48 | abstract public void paint(Graphics g, MapView mv);
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| 49 | /**
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| 50 | * Return a representative small image for this layer. The image must not
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| 51 | * be larger than 64 pixel in any dimension.
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| 52 | */
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| 53 | abstract public Icon getIcon();
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| 54 |
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| 55 | /**
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| 56 | * @return A small tooltip hint about some statistics for this layer.
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| 57 | */
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| 58 | abstract public String getToolTipText();
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| 59 |
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| 60 | /**
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| 61 | * Merges the given layer into this layer. Throws if the layer types are
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| 62 | * incompatible.
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| 63 | * @param from The layer that get merged into this one. After the merge,
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| 64 | * the other layer is not usable anymore and passing to one others
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| 65 | * mergeFrom should be one of the last things to do with a layer.
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| 66 | */
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| 67 | abstract public void mergeFrom(Layer from);
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| 68 |
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| 69 | /**
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| 70 | * @param other The other layer that is tested to be mergable with this.
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| 71 | * @return Whether the other layer can be merged into this layer.
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| 72 | */
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| 73 | abstract public boolean isMergable(Layer other);
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| 74 |
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| 75 | /**
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| 76 | * @return The bounding rectangle this layer occupies on screen when looking
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| 77 | * at x/y values or <code>null</code>, if infinite area or unknown
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| 78 | * area is occupied.
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| 79 | */
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| 80 | abstract public void visitBoundingBox(BoundingXYVisitor v);
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| 81 |
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| 82 | /**
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| 83 | * Initialize the internal dataset with the given projection.
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| 84 | */
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| 85 | abstract public void init(Projection projection);
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| 86 | }
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