Curve-Fit

Introduction: Curve-Fit is an Android library for drawing curves on Google Maps Android API v2
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Android library for drawing curves on Google Maps. This library uses Bezier cubic equation in order to compute all intermediate points of a curve.

Demo

Try sample app on Google play store

demo sample_india sample_denmark

Setup

Gradle

dependencies {
    compile 'com.github.sarweshkumar47:curve-fit:1.0.0'
}

Maven

<dependency>
 <groupId>com.github.sarweshkumar47</groupId>
 <artifactId>curve-fit</artifactId>
 <version>1.0.0</version>
 <type>pom</type>
</dependency>

Usage

In your activity's onCreate() method, use getMapAsync() to register for the map callback. Implement the OnMapReadyCallback interface and override the onMapReady() method

@Override
public void onMapReady(GoogleMap googleMap) {

    // Create CurveManager object and pass googleMaps reference to it
    curveManager = new CurveManager(googleMap);

    // Register a callback to be invoked after curve is drawn on map
    curveManager.setOnCurveDrawnCallback(this);

    // Set a listener for curve click events.
    curveManager.setOnCurveClickListener(this);

    // Create a CurveOptions object and add atleast latlong points to it
    // You can set different options in CurveOptions object similar to PolyLineOptions
    CurveOptions curveOptions = new CurveOptions();
    curveOptions.add(new LatLng(12.9715987, 77.5945627));
    curveOptions.add(new LatLng(12.2958104, 76.6393805));
    curveOptions.color(Color.DKGRAY);
    curveOptions.setAlpha(0.5f);
    curveOptions.width(12);
    List<PatternItem> pattern = Arrays.asList(new Dash(30), new Gap(30));
    curveOptions.pattern(pattern);
    curveOptions.geodesic(false);

    map.addMarker(new MarkerOptions().position(sourceLatLng).anchor(0.5f, 1f));
    map.addMarker(new MarkerOptions().position(destinationLatLng).icon(BitmapDescriptorFactory
            .defaultMarker(BitmapDescriptorFactory.HUE_GREEN)).anchor(0.5f, 1f));

    map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(12.64779202, 77.16562563), 14));

    // Draws curve asynchronously
    curveManager.drawCurveAsync(curveOptions);
}

Remove listeners in order to prevent memory leaks.

@Override
protected void onDestroy() {
    if (mapFragment != null) {
        mapFragment.getMapAsync(null);
        mapFragment = null;
    }
    if (curveManager != null) {
        curveManager.unregister();
        curveManager.setOnCurveDrawnCallback(null);
        curveManager.setOnCurveClickListener(null);
        curveManager = null;
    }
    super.onDestroy();
}

Check example projects for more info.

Advanced usage

CurveOptions

  • Alpha
    CurveOptions setAlpha(float alpha)
    

Defines shape and direction of the curve. Alpha range can vary from -1 to 1

  • ComputePointsBasedOnScreenPixels
    CurveOptions setComputePointsBasedOnScreenPixels(boolean computePointsBasedOnPixels)
    

If set to true, geographic location points will be converted to screen pixel points and algorithm uses screen pixel points to compute all curve points.

Contributions

Contributions are welcome and much appreciated.

Credit

Icons and images

License

Copyright 2018 Sarweshkumar C R

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.
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