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make MapScaleBar an Overlay

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Hannes Janetzek 2013-05-01 03:35:31 +02:00
parent 4c7a536f17
commit 16810401ff
1 changed files with 300 additions and 0 deletions
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src/org/oscim/layers/overlay/MapScaleBar.java Normal file
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/*
* Copyright 2010, 2011, 2012 mapsforge.org
* Copyright 2013 Hannes Janetzek
*
* This program is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.oscim.layers.overlay;
import java.util.HashMap;
import java.util.Map;
import org.oscim.core.MapPosition;
import org.oscim.core.MercatorProjection;
import org.oscim.layers.Layer;
import org.oscim.renderer.GLRenderer.Matrices;
import org.oscim.renderer.layer.BitmapLayer;
import org.oscim.renderer.layer.BitmapRenderer;
import org.oscim.renderer.overlays.BasicOverlay;
import org.oscim.view.MapView;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
/**
* A MapScaleBar displays the ratio of a distance on the map to the
* corresponding distance on the ground.
*/
public class MapScaleBar extends Layer {
private static final int BITMAP_HEIGHT = 64;
private static final int BITMAP_WIDTH = 128;
private static final double LATITUDE_REDRAW_THRESHOLD = 0.2;
// private static final int MARGIN_BOTTOM = 5;
// private static final int MARGIN_LEFT = 5;
private static final double METER_FOOT_RATIO = 0.3048;
private static final int ONE_KILOMETER = 1000;
private static final int ONE_MILE = 5280;
private static final Paint SCALE_BAR = new Paint(Paint.ANTI_ALIAS_FLAG);
private static final Paint SCALE_BAR_STROKE = new Paint(Paint.ANTI_ALIAS_FLAG);
private static final Paint SCALE_TEXT = new Paint(Paint.ANTI_ALIAS_FLAG);
private static final Paint SCALE_TEXT_STROKE = new Paint(Paint.ANTI_ALIAS_FLAG);
private static final int[] SCALE_BAR_VALUES_IMPERIAL = {
26400000, 10560000, 5280000,
2640000, 1056000, 528000,
264000, 105600, 52800, 26400,
10560, 5280, 2000, 1000, 500,
200, 100, 50, 20,
10, 5, 2, 1 };
private static final int[] SCALE_BAR_VALUES_METRIC = {
10000000, 5000000, 2000000, 1000000,
500000, 200000, 100000, 50000,
20000, 10000, 5000, 2000, 1000,
500, 200, 100, 50, 20, 10, 5, 2, 1 };
private boolean mImperialUnits;
private final Canvas mMapScaleCanvas;
private boolean mRedrawNeeded;
private double mPrevLatitude = -1;
private final Map<TextField, String> mTextFields;
/* private */final Bitmap mMapScaleBitmap;
/* private */boolean mUpdateBitmap;
public MapScaleBar(MapView mapView) {
super(mapView);
mMapScaleBitmap = Bitmap.createBitmap(
BITMAP_WIDTH, BITMAP_HEIGHT,
Bitmap.Config.ARGB_8888);
mMapScaleCanvas = new Canvas(mMapScaleBitmap);
mTextFields = new HashMap<TextField, String>();
setDefaultTexts();
configurePaints();
mRedrawNeeded = true;
mLayer = new BasicOverlay(mapView) {
private boolean initialized;
@Override
public void update(MapPosition pos, boolean changed, Matrices m) {
if (!initialized) {
BitmapLayer l = new BitmapLayer(true);
l.setBitmap(mMapScaleBitmap, BITMAP_WIDTH, BITMAP_HEIGHT);
layers.textureLayers = l;
newData = true;
}
if (mUpdateBitmap) {
newData = true;
mUpdateBitmap = false;
}
}
@Override
public void compile() {
synchronized (mMapScaleBitmap) {
super.compile();
}
}
@Override
public synchronized void render(MapPosition pos, Matrices m) {
// scale up 1.2
m.useScreenCoordinates(false, 8 / 1.2f);
BitmapRenderer.draw(layers.textureLayers, 1, m);
}
};
}
@Override
public void onUpdate(MapPosition mapPosition, boolean changed) {
double latitude = MercatorProjection.toLatitude(mapPosition.y);
if (!mRedrawNeeded) {
double latitudeDiff = Math.abs(mPrevLatitude - latitude);
if (latitudeDiff < LATITUDE_REDRAW_THRESHOLD)
return;
}
mPrevLatitude = latitude;
double groundResolution = MercatorProjection.calculateGroundResolution(
latitude, mapPosition.scale);
int[] scaleBarValues;
if (mImperialUnits) {
groundResolution = groundResolution / METER_FOOT_RATIO;
scaleBarValues = SCALE_BAR_VALUES_IMPERIAL;
} else {
scaleBarValues = SCALE_BAR_VALUES_METRIC;
}
float scaleBarLength = 0;
int mapScaleValue = 0;
for (int i = 0; i < scaleBarValues.length; ++i) {
mapScaleValue = scaleBarValues[i];
scaleBarLength = mapScaleValue / (float) groundResolution;
if (scaleBarLength < (BITMAP_WIDTH - 10)) {
break;
}
}
synchronized (mMapScaleBitmap) {
redrawMapScaleBitmap(scaleBarLength, mapScaleValue);
mUpdateBitmap = true;
}
mRedrawNeeded = false;
}
/**
* @return true if imperial units are used, false otherwise.
*/
public boolean isImperialUnits() {
return mImperialUnits;
}
/**
* @param imperialUnits
* true if imperial units should be used rather than metric
* units.
*/
public void setImperialUnits(boolean imperialUnits) {
mImperialUnits = imperialUnits;
mRedrawNeeded = true;
}
/**
* Overrides the specified text field with the given string.
*
* @param textField
* the text field to override.
* @param value
* the new value of the text field.
*/
public void setText(TextField textField, String value) {
mTextFields.put(textField, value);
mRedrawNeeded = true;
}
private void drawScaleBar(float scaleBarLength, Paint paint) {
mMapScaleCanvas.drawLine(7, 25, scaleBarLength + 3, 25, paint);
mMapScaleCanvas.drawLine(5, 10, 5, 40, paint);
mMapScaleCanvas.drawLine(scaleBarLength + 5, 10, scaleBarLength + 5, 40, paint);
}
private void drawScaleText(int scaleValue, String unitSymbol, Paint paint) {
mMapScaleCanvas.drawText(scaleValue + unitSymbol, 12, 18, paint);
}
/**
* Redraws the map scale bitmap with the given parameters.
*
* @param scaleBarLength
* the length of the map scale bar in pixels.
* @param mapScaleValue
* the map scale value in meters.
*/
private void redrawMapScaleBitmap(float scaleBarLength, int mapScaleValue) {
mMapScaleBitmap.eraseColor(Color.TRANSPARENT);
// draw the scale bar
drawScaleBar(scaleBarLength, SCALE_BAR_STROKE);
drawScaleBar(scaleBarLength, SCALE_BAR);
int scaleValue;
String unitSymbol;
if (mImperialUnits) {
if (mapScaleValue < ONE_MILE) {
scaleValue = mapScaleValue;
unitSymbol = mTextFields.get(TextField.FOOT);
} else {
scaleValue = mapScaleValue / ONE_MILE;
unitSymbol = mTextFields.get(TextField.MILE);
}
} else {
if (mapScaleValue < ONE_KILOMETER) {
scaleValue = mapScaleValue;
unitSymbol = mTextFields.get(TextField.METER);
} else {
scaleValue = mapScaleValue / ONE_KILOMETER;
unitSymbol = mTextFields.get(TextField.KILOMETER);
}
}
// draw the scale text
drawScaleText(scaleValue, unitSymbol, SCALE_TEXT_STROKE);
drawScaleText(scaleValue, unitSymbol, SCALE_TEXT);
}
private void setDefaultTexts() {
mTextFields.put(TextField.FOOT, " ft");
mTextFields.put(TextField.MILE, " mi");
mTextFields.put(TextField.METER, " m");
mTextFields.put(TextField.KILOMETER, " km");
}
private static void configurePaints() {
SCALE_BAR.setStrokeWidth(2);
SCALE_BAR.setStrokeCap(Paint.Cap.SQUARE);
SCALE_BAR.setColor(Color.BLACK);
SCALE_BAR_STROKE.setStrokeWidth(5);
SCALE_BAR_STROKE.setStrokeCap(Paint.Cap.SQUARE);
SCALE_BAR_STROKE.setColor(Color.WHITE);
SCALE_TEXT.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
SCALE_TEXT.setTextSize(17);
SCALE_TEXT.setColor(Color.BLACK);
SCALE_TEXT_STROKE.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
SCALE_TEXT_STROKE.setStyle(Paint.Style.STROKE);
SCALE_TEXT_STROKE.setColor(Color.WHITE);
SCALE_TEXT_STROKE.setStrokeWidth(2);
SCALE_TEXT_STROKE.setTextSize(17);
}
/**
* Enumeration of all text fields.
*/
public enum TextField {
/**
* Unit symbol for one foot.
*/
FOOT,
/**
* Unit symbol for one kilometer.
*/
KILOMETER,
/**
* Unit symbol for one meter.
*/
METER,
/**
* Unit symbol for one mile.
*/
MILE;
}
}