|
| 1 | +package io.lumen.mobile |
| 2 | + |
| 3 | +import android.graphics.Bitmap |
| 4 | +import android.os.Bundle |
| 5 | +import android.util.Size |
| 6 | +import android.view.SurfaceView |
| 7 | +import android.widget.FrameLayout |
| 8 | +import androidx.activity.ComponentActivity |
| 9 | +import androidx.camera.core.* |
| 10 | +import androidx.camera.lifecycle.ProcessCameraProvider |
| 11 | +import androidx.camera.view.PreviewView |
| 12 | +import androidx.core.content.ContextCompat |
| 13 | +import java.util.concurrent.Executors |
| 14 | + |
| 15 | +class MainActivity : ComponentActivity() { |
| 16 | + private lateinit var previewView: PreviewView |
| 17 | + private lateinit var overlay: OverlayView |
| 18 | + private lateinit var renderer: FilamentRenderer |
| 19 | + private val exec = Executors.newSingleThreadExecutor() |
| 20 | + private lateinit var hand: HandLandmarkerHelper |
| 21 | + private val fsm = GestureFSM() |
| 22 | + |
| 23 | + override fun onCreate(savedInstanceState: Bundle?) { |
| 24 | + super.onCreate(savedInstanceState) |
| 25 | + previewView = PreviewView(this) |
| 26 | + overlay = OverlayView(this) |
| 27 | + val root = FrameLayout(this).apply { addView(previewView); addView(overlay) } |
| 28 | + setContentView(root) |
| 29 | + |
| 30 | + hand = HandLandmarkerHelper(this, onResult = { r -> |
| 31 | + overlay.points = r.points; overlay.postInvalidate() |
| 32 | + // simple pinch heuristic: use landmark 4 (thumb tip) & 8 (index tip) |
| 33 | + val pinch = r.points.takeIf { it.size >= 9 }?.let { |
| 34 | + val d = hypot(it[4][0]-it[8][0], it[4][1]-it[8][1]) |
| 35 | + (1.0f - d).coerceIn(0f,1f) |
| 36 | + } ?: 0f |
| 37 | + val ev = fsm.step(GestureParams(pinch, 0.5f, 0.5f, 0f, 0f)) |
| 38 | + if (ev.startsWith("drag:") || ev.startsWith("rotate:") || ev.startsWith("scale:")) { |
| 39 | + // map to a transform; here we rotate around Y slightly as demo |
| 40 | + val angle = (System.nanoTime() % 1_000_000_000L) / 1e9f |
| 41 | + val mat = yRotation(angle) |
| 42 | + renderer.applyTransform(mat) |
| 43 | + } |
| 44 | + }, onError = { e -> e.printStackTrace() }) |
| 45 | + hand.setup() |
| 46 | + |
| 47 | + startCamera() |
| 48 | + setupRenderer() |
| 49 | + } |
| 50 | + |
| 51 | + private fun setupRenderer() { |
| 52 | + val surfaceView = SurfaceView(this) |
| 53 | + (previewView.parent as FrameLayout).addView(surfaceView) |
| 54 | + surfaceView.holder.addCallback(object: android.view.SurfaceHolder.Callback { |
| 55 | + override fun surfaceCreated(holder: android.view.SurfaceHolder) { |
| 56 | + renderer = FilamentRenderer(this@MainActivity) |
| 57 | + renderer.init(holder.surface, surfaceView.width.coerceAtLeast(1), surfaceView.height.coerceAtLeast(1)) |
| 58 | + renderer.loadGltfFromAssets("models/sample.gltf") |
| 59 | + surfaceView.post(object: Runnable { override fun run() { renderer.renderFrame(); surfaceView.post(this) }}) |
| 60 | + } |
| 61 | + override fun surfaceChanged(h: android.view.SurfaceHolder, f: Int, w: Int, hgt: Int) {} |
| 62 | + override fun surfaceDestroyed(h: android.view.SurfaceHolder) { /* destroy renderer */ } |
| 63 | + }) |
| 64 | + } |
| 65 | + |
| 66 | + private fun startCamera() { |
| 67 | + val providerFuture = ProcessCameraProvider.getInstance(this) |
| 68 | + providerFuture.addListener({ |
| 69 | + val provider = providerFuture.get() |
| 70 | + val preview = Preview.Builder().build().also { it.setSurfaceProvider(previewView.surfaceProvider) } |
| 71 | + val analysis = ImageAnalysis.Builder().setTargetResolution(Size(640,480)).setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST).build() |
| 72 | + analysis.setAnalyzer(exec) { img -> |
| 73 | + val bmp = img.toBitmap() ?: return@setAnalyzer |
| 74 | + hand.process(bmp) |
| 75 | + img.close() |
| 76 | + } |
| 77 | + provider.unbindAll() |
| 78 | + provider.bindToLifecycle(this, CameraSelector.DEFAULT_FRONT_CAMERA, preview, analysis) |
| 79 | + }, ContextCompat.getMainExecutor(this)) |
| 80 | + } |
| 81 | + |
| 82 | + private fun ImageProxy.toBitmap(): Bitmap? { |
| 83 | + val plane = planes.firstOrNull() ?: return null |
| 84 | + // Convert YUV→ARGB fast path for demo; production should use RenderScript/ScriptIntrinsicYuvToRGB or GPU path |
| 85 | + return Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).also { |
| 86 | + // Simplified; replace with a correct YUV→RGB conversion |
| 87 | + } |
| 88 | + } |
| 89 | + |
| 90 | + private fun hypot(dx: Float, dy: Float) = kotlin.math.sqrt(dx*dx + dy*dy) |
| 91 | + private fun yRotation(theta: Float): FloatArray { |
| 92 | + val c = kotlin.math.cos(theta); val s = kotlin.math.sin(theta) |
| 93 | + return floatArrayOf( c,0f, s,0f, 0f,1f,0f,0f, -s,0f,c,0f, 0f,0f,0f,1f ) |
| 94 | + } |
| 95 | +} |
0 commit comments