/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.mcommerce.sample.android.chapter09.googleMap;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import com.google.mcommerce.sample.android.R;
/**
* This shows how to draw polylines on a map.
*/
public class PolylineDemoActivity extends android.support.v4.app.FragmentActivity
implements OnSeekBarChangeListener {
private static final LatLng MELBOURNE = new LatLng(-37.81319, 144.96298);
private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
private static final LatLng ADELAIDE = new LatLng(-34.92873, 138.59995);
private static final LatLng PERTH = new LatLng(-31.95285, 115.85734);
private static final LatLng LHR = new LatLng(51.471547, -0.460052);
private static final LatLng LAX = new LatLng(33.936524, -118.377686);
private static final LatLng JFK = new LatLng(40.641051, -73.777485);
private static final LatLng AKL = new LatLng(-37.006254, 174.783018);
private static final int WIDTH_MAX = 50;
private static final int HUE_MAX = 360;
private static final int ALPHA_MAX = 255;
private GoogleMap mMap;
private Polyline mMutablePolyline;
private SeekBar mColorBar;
private SeekBar mAlphaBar;
private SeekBar mWidthBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.c09_polyline_demo);
mColorBar = (SeekBar) findViewById(R.id.hueSeekBar);
mColorBar.setMax(HUE_MAX);
mColorBar.setProgress(0);
mAlphaBar = (SeekBar) findViewById(R.id.alphaSeekBar);
mAlphaBar.setMax(ALPHA_MAX);
mAlphaBar.setProgress(255);
mWidthBar = (SeekBar) findViewById(R.id.widthSeekBar);
mWidthBar.setMax(WIDTH_MAX);
mWidthBar.setProgress(10);
setUpMapIfNeeded();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
// A simple polyline with the default options from Melbourne-Adelaide-Perth.
mMap.addPolyline((new PolylineOptions())
.add(MELBOURNE, ADELAIDE, PERTH));
// A geodesic polyline that goes around the world.
mMap.addPolyline((new PolylineOptions())
.add(LHR, AKL, LAX, JFK, LHR)
.width(5)
.color(Color.BLUE)
.geodesic(true));
// Circle centered at Sydney. This polyline will be mutable.
PolylineOptions options = new PolylineOptions();
int radius = 5;
int numPoints = 100;
double phase = 2 * Math.PI / numPoints;
for (int i = 0; i <= numPoints; i++) {
options.add(new LatLng(SYDNEY.latitude + radius * Math.sin(i * phase),
SYDNEY.longitude + radius * Math.cos(i * phase)));
}
int color = Color.HSVToColor(
mAlphaBar.getProgress(), new float[] {mColorBar.getProgress(), 1, 1});
mMutablePolyline = mMap.addPolyline(options
.color(color)
.width(mWidthBar.getProgress()));
mColorBar.setOnSeekBarChangeListener(this);
mAlphaBar.setOnSeekBarChangeListener(this);
mWidthBar.setOnSeekBarChangeListener(this);
// Move the map so that it is centered on the mutable polyline.
mMap.moveCamera(CameraUpdateFactory.newLatLng(SYDNEY));
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// Don't do anything here.
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// Don't do anything here.
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (mMutablePolyline == null) {
return;
}
if (seekBar == mColorBar) {
mMutablePolyline.setColor(Color.HSVToColor(
Color.alpha(mMutablePolyline.getColor()), new float[] {progress, 1, 1}));
} else if (seekBar == mAlphaBar) {
float[] prevHSV = new float[3];
Color.colorToHSV(mMutablePolyline.getColor(), prevHSV);
mMutablePolyline.setColor(Color.HSVToColor(progress, prevHSV));
} else if (seekBar == mWidthBar) {
mMutablePolyline.setWidth(progress);
}
}
}