Animate images with image overlay

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/*
 * Copyright 2020 Esri
 *
 * 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.esri.arcgisruntime.sample.animateimageswithimageoverlay

import android.os.Bundle
import android.view.MotionEvent
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Button
import android.widget.SeekBar
import android.widget.Spinner
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.coordinatorlayout.widget.CoordinatorLayout
import com.esri.arcgisruntime.geometry.Envelope
import com.esri.arcgisruntime.geometry.Point
import com.esri.arcgisruntime.geometry.SpatialReferences
import com.esri.arcgisruntime.layers.ArcGISTiledLayer
import com.esri.arcgisruntime.mapping.ArcGISScene
import com.esri.arcgisruntime.mapping.ArcGISTiledElevationSource
import com.esri.arcgisruntime.mapping.Basemap
import com.esri.arcgisruntime.mapping.Surface
import com.esri.arcgisruntime.mapping.Viewpoint
import com.esri.arcgisruntime.mapping.view.Camera
import com.esri.arcgisruntime.mapping.view.DefaultSceneViewOnTouchListener
import com.esri.arcgisruntime.mapping.view.ImageFrame
import com.esri.arcgisruntime.mapping.view.ImageOverlay
import com.esri.arcgisruntime.mapping.view.SceneView
import com.esri.arcgisruntime.sample.animateimageswithimageoverlay.databinding.ActivityMainBinding
import com.google.android.material.floatingactionbutton.FloatingActionButton
import java.io.File
import java.util.*
import kotlin.concurrent.fixedRateTimer

class MainActivity : AppCompatActivity() {

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val sceneView: SceneView by lazy {
        activityMainBinding.sceneView
    }

    private val startStopButton: Button by lazy {
        activityMainBinding.startStopButton
    }

    private val fab: FloatingActionButton by lazy {
        activityMainBinding.fab
    }

    private val opacitySeekBar: SeekBar by lazy {
        activityMainBinding.opacitySeekBar
    }

    private val currOpacityTextView: TextView by lazy {
        activityMainBinding.currOpacityTextView
    }

    private val fpsSpinner: Spinner by lazy {
        activityMainBinding.fpsSpinner
    }

    private val imageFrames: MutableList<ImageFrame> by lazy { mutableListOf() }
    private var imageIndex: Int = 0

    private var timer: Timer? = null
    private var isTimerRunning = true
    private var period: Long = 67

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

        // create a new tiled layer from the World Dark Gray Base REST service
        val worldDarkGrayBasemap =
            ArcGISTiledLayer("https://services.arcgisonline.com/arcgis/rest/services/Canvas/World_Dark_Gray_Base/MapServer")

        // create a new elevation source from the Terrain3D REST service
        val elevationSource =
            ArcGISTiledElevationSource("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer")

        // create an envelope of the pacific southwest sector for displaying the image frame
        val pointForImageFrame =
            Point(-120.0724273439448, 35.131016955536694, SpatialReferences.getWgs84())
        val pacificSouthwestEnvelope =
            Envelope(pointForImageFrame, 15.09589635986124, -14.3770441522488)

        // create a camera, looking at the pacific southwest sector
        val observationPoint = Point(-116.621, 24.7773, 856977.0)
        val camera = Camera(observationPoint, 353.994, 48.5495, 0.0)
        val pacificSouthwestViewpoint = Viewpoint(pacificSouthwestEnvelope, camera)

        // create a scene with the dark gray basemap and elevation source
        val darkGrayScene =
            ArcGISScene(Basemap(worldDarkGrayBasemap), Surface(listOf(elevationSource)))

        // create the scene view
        sceneView.apply {
            // add the scene to the scene view
            scene = darkGrayScene
            // set the view point to the pacific south west
            setViewpoint(pacificSouthwestViewpoint)
            // create and append an image overlay to the scene view
            imageOverlays.add(ImageOverlay())
        }

        // get the image files from local storage as an unordered list
        (File(getExternalFilesDir(null).toString() + "/PacificSouthWest").listFiles())?.let { imageFiles ->
            // sort the list of image files
            Arrays.sort(imageFiles)
            imageFiles.forEach { file ->
                // create an image with the given path and use it to create an image frame
                val imageFrame = ImageFrame(file.path, pacificSouthwestEnvelope)
                imageFrames.add(imageFrame)
            }
        }

        // setup touch and ui element behaviours
        setupUI()
    }

    /**
     * Create a new image frame from the image at the current index and add it to the image overlay.
     */
    private fun addNextImageFrameToImageOverlay() {
        // set image frame to image overlay
        sceneView.imageOverlays[0].imageFrame = imageFrames[imageIndex]
        // increment the index to keep track of which image to load next
        imageIndex++
        // reset index once all files have been loaded
        if (imageIndex == imageFrames.size)
            imageIndex = 0
    }

    /**
     * Toggles starting and stopping the timer on button tap.
     */
    fun toggleAnimationTimer(view: View) {
        isTimerRunning = when {
            isTimerRunning -> {
                // cancel any running timer
                timer?.cancel()
                // change the start/stop button to "start"
                startStopButton.text = getString(R.string.start)
                // set the isTimerRunning flag to false
                false
            }
            else -> {
                createNewTimer()
                // change the start/stop button to "stop"
                startStopButton.text = getString(R.string.stop)
                // set the isTimerRunning flag to true
                true
            }
        }
    }

    /**
     * Create a new timer for the given period which repeatedly calls animateImagesWithImageOverlay.
     */
    private fun createNewTimer() {
        timer = fixedRateTimer("Image overlay timer", period = period) {
            addNextImageFrameToImageOverlay()
        }
    }

    /**
     * Sets up UI behaviour. Closes expandable floating action button on touching the scene view.
     * Moves floating action button on attribution view expanded. Expands floating action button on
     * tap. Defines seek bar to control image overlay opacity. Populates and defines behaviour of the
     * FPS (frames per second) spinner.
     */
    private fun setupUI() {
        sceneView.apply {
            // create a touch listener
            setOnTouchListener(object : DefaultSceneViewOnTouchListener(sceneView) {
                // close the options sheet when the map is tapped
                override fun onTouch(view: View?, motionEvent: MotionEvent?): Boolean {
                    if (fab.isExpanded) {
                        fab.isExpanded = false
                    }
                    return super.onTouch(view, motionEvent)
                }
            })
            // ensure the floating action button moves to be above the attribution view
            addAttributionViewLayoutChangeListener { _, _, _, _, bottom, _, _, _, oldBottom ->
                val heightDelta = bottom - oldBottom
                (fab.layoutParams as CoordinatorLayout.LayoutParams).bottomMargin += heightDelta
            }
        }

        // show the options sheet when the floating action button is clicked
        fab.setOnClickListener {
            fab.isExpanded = !fab.isExpanded
        }

        // seek bar controls image overlay opacity
        opacitySeekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
                // convert the seekbar progress (0 - 100) to a float 0.0 - 1.0
                val opacity: Float = progress.toFloat() / 100
                sceneView.imageOverlays[0].opacity = opacity
                currOpacityTextView.text = opacity.toString()
            }

            override fun onStartTrackingTouch(seekBar: SeekBar?) {}
            override fun onStopTrackingTouch(seekBar: SeekBar?) {}
        })

        // spinner controls how many image overlays to display per second
        fpsSpinner.apply {
            // create an adapter with fps options
            adapter = ArrayAdapter(
                this@MainActivity,
                android.R.layout.simple_spinner_dropdown_item,
                arrayOf("60 fps", "30 fps", "15 fps")
            )
            // set period based on the fps option selected
            onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                override fun onItemSelected(
                    parent: AdapterView<*>?,
                    view: View?,
                    position: Int,
                    id: Long
                ) {
                    // get the period for the chosen fps
                    period = when (position) {
                        0 -> 17 // 1000ms/17 = 60 fps
                        1 -> 33 // 1000ms/33 = 30 fps
                        2 -> 67 // 1000ms/67 = 15 fps
                        else -> 0
                    }
                    // create a new timer for this period
                    if (isTimerRunning) {
                        timer?.cancel()
                        createNewTimer()
                    }
                }

                override fun onNothingSelected(parent: AdapterView<*>?) {}
            }
            // start at 15 fps
            setSelection(2)
        }
    }

    override fun onPause() {
        // cancel timer if it's running
        if (isTimerRunning) {
            toggleAnimationTimer(startStopButton)
        }
        sceneView.pause()
        super.onPause()
    }

    override fun onResume() {
        super.onResume()
        sceneView.resume()
    }

    override fun onDestroy() {
        sceneView.dispose()
        super.onDestroy()
    }
}