/*
* 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 java.util.Arrays;
import java.util.List;
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.Polygon;
import com.google.android.gms.maps.model.PolygonOptions;
import com.google.mcommerce.sample.android.R;
/**
* This shows how to draw polygons on a map.
*/
public class PolygonDemoActivity extends android.support.v4.app.FragmentActivity
implements OnSeekBarChangeListener {
private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
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 Polygon mMutablePolygon;
private SeekBar mColorBar;
private SeekBar mAlphaBar;
private SeekBar mWidthBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.c09_polygon_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(127);
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() {
// Create a rectangle with two rectangular holes.
mMap.addPolygon(new PolygonOptions()
.addAll(createRectangle(new LatLng(-20, 130), 5, 5))
.addHole(createRectangle(new LatLng(-22, 128), 1, 1))
.addHole(createRectangle(new LatLng(-18, 133), 0.5, 1.5))
.fillColor(Color.CYAN)
.strokeColor(Color.BLUE)
.strokeWidth(5));
// Create an ellipse centered at Sydney.
PolygonOptions options = new PolygonOptions();
int numPoints = 400;
float semiHorizontalAxis = 10f;
float semiVerticalAxis = 5f;
double phase = 2 * Math.PI / numPoints;
for (int i = 0; i <= numPoints; i++) {
options.add(new LatLng(SYDNEY.latitude + semiVerticalAxis * Math.sin(i * phase),
SYDNEY.longitude + semiHorizontalAxis * Math.cos(i * phase)));
}
int fillColor = Color.HSVToColor(
mAlphaBar.getProgress(), new float[] {mColorBar.getProgress(), 1, 1});
mMutablePolygon = mMap.addPolygon(options
.strokeWidth(mWidthBar.getProgress())
.strokeColor(Color.BLACK)
.fillColor(fillColor));
mColorBar.setOnSeekBarChangeListener(this);
mAlphaBar.setOnSeekBarChangeListener(this);
mWidthBar.setOnSeekBarChangeListener(this);
// Move the map so that it is centered on the mutable polygon.
mMap.moveCamera(CameraUpdateFactory.newLatLng(SYDNEY));
}
/**
* Creates a List of LatLngs that form a rectangle with the given dimensions.
*/
private List<LatLng> createRectangle(LatLng center, double halfWidth, double halfHeight) {
// Note that the ordering of the points is counterclockwise (as long as the halfWidth and
// halfHeight are less than 90).
return Arrays.asList(new LatLng(center.latitude - halfHeight, center.longitude - halfWidth),
new LatLng(center.latitude - halfHeight, center.longitude + halfWidth),
new LatLng(center.latitude + halfHeight, center.longitude + halfWidth),
new LatLng(center.latitude + halfHeight, center.longitude - halfWidth),
new LatLng(center.latitude - halfHeight, center.longitude - halfWidth));
}
@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 (mMutablePolygon == null) {
return;
}
if (seekBar == mColorBar) {
mMutablePolygon.setFillColor(Color.HSVToColor(
Color.alpha(mMutablePolygon.getFillColor()), new float[] {progress, 1, 1}));
} else if (seekBar == mAlphaBar) {
int prevColor = mMutablePolygon.getFillColor();
mMutablePolygon.setFillColor(Color.argb(
progress, Color.red(prevColor), Color.green(prevColor),
Color.blue(prevColor)));
} else if (seekBar == mWidthBar) {
mMutablePolygon.setStrokeWidth(progress);
}
}
}