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BoundingBoxOverlay.kt
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BoundingBoxOverlay.kt
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/*
* Copyright 2021 Shubham Panchal
* 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.shubham0204.ml.handdetection
import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Matrix
import android.graphics.Paint
import android.util.AttributeSet
import android.util.DisplayMetrics
import android.view.SurfaceHolder
import android.view.SurfaceView
import androidx.core.graphics.toRectF
class BoundingBoxOverlay(context : Context, attributeSet : AttributeSet)
: SurfaceView( context , attributeSet ) , SurfaceHolder.Callback {
// Variables used to compute output2overlay transformation matrix
// These are assigned in FrameAnalyser.kt
var areDimsInit = false
var frameHeight = 0
var frameWidth = 0
// This var is assigned in FrameAnalyser.kt
var handBoundingBoxes: List<Prediction>? = null
// This var is assigned in MainActivity.kt
var isFrontCameraOn = false
private var output2OverlayTransform: Matrix = Matrix()
private val boxPaint = Paint().apply {
color = Color.YELLOW
style = Paint.Style.STROKE
strokeWidth = 16f
}
private val textPaint = Paint().apply {
strokeWidth = 2.0f
textSize = 32f
color = Color.YELLOW
}
private val displayMetrics = DisplayMetrics()
override fun surfaceCreated(p0: SurfaceHolder) {
}
override fun surfaceChanged(p0: SurfaceHolder, p1: Int, p2: Int, p3: Int) {
}
override fun surfaceDestroyed(p0: SurfaceHolder) {
}
override fun onDraw(canvas: Canvas?) {
if ( handBoundingBoxes == null ) {
return
}
if (!areDimsInit) {
val viewWidth = canvas!!.width.toFloat()
val viewHeight = canvas.height.toFloat()
val xFactor: Float = viewWidth / frameWidth.toFloat()
val yFactor: Float = viewHeight / frameHeight.toFloat()
// Scale the coordinates
output2OverlayTransform.preScale(xFactor, yFactor)
if ( isFrontCameraOn ) {
Logger.logInfo( "Transformation matrix configured for front camera." )
}
else {
Logger.logInfo( "Transformation matrix configured for rear camera." )
}
areDimsInit = true
}
else {
for ( prediction in handBoundingBoxes!! ) {
val rect = prediction.boundingBox.toRectF()
output2OverlayTransform.mapRect( rect )
canvas?.drawRoundRect( rect , 16f, 16f, boxPaint )
canvas?.drawText(
prediction.confidence.toString(),
rect.centerX(),
rect.centerY(),
textPaint
)
}
}
}
}