make MapScaleBar an Overlay
This commit is contained in:
Hannes Janetzek
parent
4c7a536f17
commit
16810401ff
300
src/org/oscim/layers/overlay/MapScaleBar.java
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300
src/org/oscim/layers/overlay/MapScaleBar.java
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/*
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* Copyright 2010, 2011, 2012 mapsforge.org
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* Copyright 2013 Hannes Janetzek
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.layers.overlay;
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import java.util.HashMap;
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import java.util.Map;
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import org.oscim.core.MapPosition;
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import org.oscim.core.MercatorProjection;
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import org.oscim.layers.Layer;
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import org.oscim.renderer.GLRenderer.Matrices;
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import org.oscim.renderer.layer.BitmapLayer;
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import org.oscim.renderer.layer.BitmapRenderer;
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import org.oscim.renderer.overlays.BasicOverlay;
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import org.oscim.view.MapView;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Typeface;
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/**
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* A MapScaleBar displays the ratio of a distance on the map to the
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* corresponding distance on the ground.
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*/
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public class MapScaleBar extends Layer {
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private static final int BITMAP_HEIGHT = 64;
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private static final int BITMAP_WIDTH = 128;
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private static final double LATITUDE_REDRAW_THRESHOLD = 0.2;
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// private static final int MARGIN_BOTTOM = 5;
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// private static final int MARGIN_LEFT = 5;
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private static final double METER_FOOT_RATIO = 0.3048;
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private static final int ONE_KILOMETER = 1000;
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private static final int ONE_MILE = 5280;
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private static final Paint SCALE_BAR = new Paint(Paint.ANTI_ALIAS_FLAG);
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private static final Paint SCALE_BAR_STROKE = new Paint(Paint.ANTI_ALIAS_FLAG);
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private static final Paint SCALE_TEXT = new Paint(Paint.ANTI_ALIAS_FLAG);
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private static final Paint SCALE_TEXT_STROKE = new Paint(Paint.ANTI_ALIAS_FLAG);
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private static final int[] SCALE_BAR_VALUES_IMPERIAL = {
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26400000, 10560000, 5280000,
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2640000, 1056000, 528000,
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264000, 105600, 52800, 26400,
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10560, 5280, 2000, 1000, 500,
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200, 100, 50, 20,
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10, 5, 2, 1 };
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private static final int[] SCALE_BAR_VALUES_METRIC = {
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10000000, 5000000, 2000000, 1000000,
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500000, 200000, 100000, 50000,
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20000, 10000, 5000, 2000, 1000,
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500, 200, 100, 50, 20, 10, 5, 2, 1 };
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private boolean mImperialUnits;
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private final Canvas mMapScaleCanvas;
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private boolean mRedrawNeeded;
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private double mPrevLatitude = -1;
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private final Map<TextField, String> mTextFields;
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/* private */final Bitmap mMapScaleBitmap;
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/* private */boolean mUpdateBitmap;
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public MapScaleBar(MapView mapView) {
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super(mapView);
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mMapScaleBitmap = Bitmap.createBitmap(
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BITMAP_WIDTH, BITMAP_HEIGHT,
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Bitmap.Config.ARGB_8888);
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mMapScaleCanvas = new Canvas(mMapScaleBitmap);
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mTextFields = new HashMap<TextField, String>();
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setDefaultTexts();
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configurePaints();
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mRedrawNeeded = true;
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mLayer = new BasicOverlay(mapView) {
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private boolean initialized;
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@Override
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public void update(MapPosition pos, boolean changed, Matrices m) {
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if (!initialized) {
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BitmapLayer l = new BitmapLayer(true);
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l.setBitmap(mMapScaleBitmap, BITMAP_WIDTH, BITMAP_HEIGHT);
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layers.textureLayers = l;
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newData = true;
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}
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if (mUpdateBitmap) {
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newData = true;
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mUpdateBitmap = false;
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}
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}
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@Override
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public void compile() {
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synchronized (mMapScaleBitmap) {
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super.compile();
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}
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}
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@Override
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public synchronized void render(MapPosition pos, Matrices m) {
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// scale up 1.2
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m.useScreenCoordinates(false, 8 / 1.2f);
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BitmapRenderer.draw(layers.textureLayers, 1, m);
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}
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};
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}
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@Override
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public void onUpdate(MapPosition mapPosition, boolean changed) {
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double latitude = MercatorProjection.toLatitude(mapPosition.y);
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if (!mRedrawNeeded) {
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double latitudeDiff = Math.abs(mPrevLatitude - latitude);
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if (latitudeDiff < LATITUDE_REDRAW_THRESHOLD)
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return;
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}
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mPrevLatitude = latitude;
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double groundResolution = MercatorProjection.calculateGroundResolution(
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latitude, mapPosition.scale);
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int[] scaleBarValues;
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if (mImperialUnits) {
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groundResolution = groundResolution / METER_FOOT_RATIO;
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scaleBarValues = SCALE_BAR_VALUES_IMPERIAL;
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} else {
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scaleBarValues = SCALE_BAR_VALUES_METRIC;
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}
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float scaleBarLength = 0;
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int mapScaleValue = 0;
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for (int i = 0; i < scaleBarValues.length; ++i) {
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mapScaleValue = scaleBarValues[i];
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scaleBarLength = mapScaleValue / (float) groundResolution;
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if (scaleBarLength < (BITMAP_WIDTH - 10)) {
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break;
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}
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}
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synchronized (mMapScaleBitmap) {
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redrawMapScaleBitmap(scaleBarLength, mapScaleValue);
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mUpdateBitmap = true;
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}
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mRedrawNeeded = false;
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}
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/**
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* @return true if imperial units are used, false otherwise.
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*/
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public boolean isImperialUnits() {
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return mImperialUnits;
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}
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/**
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* @param imperialUnits
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* true if imperial units should be used rather than metric
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* units.
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*/
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public void setImperialUnits(boolean imperialUnits) {
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mImperialUnits = imperialUnits;
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mRedrawNeeded = true;
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}
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/**
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* Overrides the specified text field with the given string.
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*
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* @param textField
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* the text field to override.
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* @param value
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* the new value of the text field.
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*/
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public void setText(TextField textField, String value) {
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mTextFields.put(textField, value);
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mRedrawNeeded = true;
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}
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private void drawScaleBar(float scaleBarLength, Paint paint) {
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mMapScaleCanvas.drawLine(7, 25, scaleBarLength + 3, 25, paint);
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mMapScaleCanvas.drawLine(5, 10, 5, 40, paint);
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mMapScaleCanvas.drawLine(scaleBarLength + 5, 10, scaleBarLength + 5, 40, paint);
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}
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private void drawScaleText(int scaleValue, String unitSymbol, Paint paint) {
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mMapScaleCanvas.drawText(scaleValue + unitSymbol, 12, 18, paint);
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}
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/**
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* Redraws the map scale bitmap with the given parameters.
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*
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* @param scaleBarLength
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* the length of the map scale bar in pixels.
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* @param mapScaleValue
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* the map scale value in meters.
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*/
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private void redrawMapScaleBitmap(float scaleBarLength, int mapScaleValue) {
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mMapScaleBitmap.eraseColor(Color.TRANSPARENT);
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// draw the scale bar
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drawScaleBar(scaleBarLength, SCALE_BAR_STROKE);
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drawScaleBar(scaleBarLength, SCALE_BAR);
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int scaleValue;
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String unitSymbol;
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if (mImperialUnits) {
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if (mapScaleValue < ONE_MILE) {
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scaleValue = mapScaleValue;
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unitSymbol = mTextFields.get(TextField.FOOT);
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} else {
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scaleValue = mapScaleValue / ONE_MILE;
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unitSymbol = mTextFields.get(TextField.MILE);
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}
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} else {
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if (mapScaleValue < ONE_KILOMETER) {
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scaleValue = mapScaleValue;
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unitSymbol = mTextFields.get(TextField.METER);
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} else {
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scaleValue = mapScaleValue / ONE_KILOMETER;
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unitSymbol = mTextFields.get(TextField.KILOMETER);
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}
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}
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// draw the scale text
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drawScaleText(scaleValue, unitSymbol, SCALE_TEXT_STROKE);
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drawScaleText(scaleValue, unitSymbol, SCALE_TEXT);
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}
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private void setDefaultTexts() {
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mTextFields.put(TextField.FOOT, " ft");
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mTextFields.put(TextField.MILE, " mi");
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mTextFields.put(TextField.METER, " m");
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mTextFields.put(TextField.KILOMETER, " km");
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}
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private static void configurePaints() {
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SCALE_BAR.setStrokeWidth(2);
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SCALE_BAR.setStrokeCap(Paint.Cap.SQUARE);
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SCALE_BAR.setColor(Color.BLACK);
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SCALE_BAR_STROKE.setStrokeWidth(5);
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SCALE_BAR_STROKE.setStrokeCap(Paint.Cap.SQUARE);
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SCALE_BAR_STROKE.setColor(Color.WHITE);
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SCALE_TEXT.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
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SCALE_TEXT.setTextSize(17);
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SCALE_TEXT.setColor(Color.BLACK);
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SCALE_TEXT_STROKE.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
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SCALE_TEXT_STROKE.setStyle(Paint.Style.STROKE);
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SCALE_TEXT_STROKE.setColor(Color.WHITE);
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SCALE_TEXT_STROKE.setStrokeWidth(2);
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SCALE_TEXT_STROKE.setTextSize(17);
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}
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/**
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* Enumeration of all text fields.
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*/
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public enum TextField {
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/**
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* Unit symbol for one foot.
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*/
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FOOT,
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/**
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* Unit symbol for one kilometer.
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*/
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KILOMETER,
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/**
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* Unit symbol for one meter.
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*/
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METER,
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/**
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* Unit symbol for one mile.
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*/
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MILE;
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}
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}
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