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SmartToolFactorySmartToolFactory
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refactor ScreenColorDetector
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4 files changed

+356
-125
lines changed

4 files changed

+356
-125
lines changed

‎app/src/main/java/com/smarttoolfactory/composecolorpicker/demo/ColorDetectionFromScreenDemo.kt‎

Lines changed: 3 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -48,18 +48,16 @@ fun ColorDetectionFromScreenDemo() {
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)
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ScreenColorDetector(
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modifier = Modifier.wrapContentSize().padding(10.dp),
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modifier = Modifier.border(2.dp, Color.Cyan).padding(25.dp),
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content = {
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Column(
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modifier = Modifier
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.border(2.dp, Color.Green)
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.padding(5.dp)
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modifier = Modifier.border(1.dp, Color.Magenta)
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) {
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Image(
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bitmap = ImageBitmap.imageResource(
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LocalContext.current.resources,
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R.drawable.landscape
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R.drawable.landscape10
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),
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contentDescription = null,
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modifier = Modifier

‎app/src/main/res/drawable/landscape10.jpg‎

25.6 KB
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‎colorpicker/src/main/java/com/smarttoolfactory/colorpicker/util/ColorDetectionUtil.kt‎

Lines changed: 153 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,153 @@
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package com.smarttoolfactory.colorpicker.util
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import android.graphics.Bitmap
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import androidx.compose.ui.graphics.Color
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/**
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* Calculates color of pixel in ([offsetX], [offsetY]) in [bitmap] that is in a Composable with
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* [width] and [height].
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*
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* @param offsetX x position of bitmap
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* @param offsetY y position of bitmap
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* @param startImageX x coordinate of top left position of image.
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* @param startImageY y coordinate of top left position of image.
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* @param width width of Composable that contains [bitmap].
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* @param height height of Composable that contains [bitmap].
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* might not match each other.
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* @param bitmap image used for detecting colors of.
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*/
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fun calculateColorInPixel(
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offsetX: Float,
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offsetY: Float,
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startImageX: Float = 0f,
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startImageY: Float = 0f,
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width: Int,
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height: Int,
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bitmap: Bitmap,
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): Color {
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val bitmapWidth = bitmap.width
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val bitmapHeight = bitmap.height
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// End positions, this might be less than Image dimensions if bitmap doesn't fit Image
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val endImageX = width - startImageX
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val endImageY = height - startImageY
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val scaledX =
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scale(
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start1 = startImageX,
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end1 = endImageX,
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pos = offsetX,
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start2 = 0f,
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end2 = bitmapWidth.toFloat()
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).toInt().coerceIn(0, bitmapWidth - 1)
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val scaledY =
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scale(
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start1 = startImageY,
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end1 = endImageY,
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pos = offsetY,
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start2 = 0f,
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end2 = bitmapHeight.toFloat()
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).toInt().coerceIn(0, bitmapHeight - 1)
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val pixel: Int = bitmap.getPixel(scaledX, scaledY)
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val red = android.graphics.Color.red(pixel)
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val green = android.graphics.Color.green(pixel)
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val blue = android.graphics.Color.blue(pixel)
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return (Color(red, green, blue))
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}
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/**
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* Calculates color in a [radius] in ([offsetX], [offsetY]) in [bitmap] that is in a Composable with
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* [width] and [height].
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*
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* @param offsetX x position of bitmap
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* @param offsetY y position of bitmap
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* @param startImageX x coordinate of top left position of image.
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* @param startImageY y coordinate of top left position of image.
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* @param width width of Composable that contains [bitmap].
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* @param height height of Composable that contains [bitmap].
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* @param radius of color detection circle. Based on this radius colors are calculated and
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* average of red, green, blue is returned as [Color]
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* @param bitmap image used for detecting colors of.
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*/
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fun calculateColorInRadius(
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offsetX: Float,
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offsetY: Float,
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startImageX: Float = 0f,
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startImageY: Float = 0f,
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width: Int,
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height: Int,
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radius: Float = 0f,
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bitmap: Bitmap,
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): Color {
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val bitmapWidth = bitmap.width
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val bitmapHeight = bitmap.height
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// End positions, this might be less than Image dimensions if bitmap doesn't fit Image
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val endImageX = width - startImageX
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val endImageY = height - startImageY
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val scaledX =
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scale(
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start1 = startImageX,
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end1 = endImageX,
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pos = offsetX,
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start2 = 0f,
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end2 = bitmapWidth.toFloat()
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).toInt().coerceIn(0, bitmapWidth - 1)
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val scaledY =
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scale(
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start1 = startImageY,
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end1 = endImageY,
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pos = offsetY,
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start2 = 0f,
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end2 = bitmapHeight.toFloat()
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).toInt().coerceIn(0, bitmapHeight - 1)
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val color = if (radius <= 0f) {
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val pixel: Int = bitmap.getPixel(scaledX, scaledY)
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val red = android.graphics.Color.red(pixel)
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val green = android.graphics.Color.green(pixel)
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val blue = android.graphics.Color.blue(pixel)
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Color(red, green, blue)
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} else {
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val startX = (scaledX - radius).toInt().coerceAtLeast(0)
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val endX = (scaledX + radius).toInt().coerceAtMost(width)
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val startY = (scaledY - radius).toInt().coerceAtLeast(0)
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val endY = (scaledY + radius).toInt().coerceAtMost(height)
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val averageColor = floatArrayOf(0f, 0f, 0f)
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var count = 1
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for (x in startX..endX) {
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for (y in startY..endY) {
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// TODO Add a distance check to make sure that pixels are inside a circle
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val pixel: Int = bitmap.getPixel(x, y)
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val red = android.graphics.Color.red(pixel)
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val green = android.graphics.Color.green(pixel)
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val blue = android.graphics.Color.blue(pixel)
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averageColor[0] += (red - averageColor[0]) / count
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averageColor[1] += (green - averageColor[1]) / count
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averageColor[2] += (blue - averageColor[2]) / count
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count++
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}
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}
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Color(averageColor[0].toInt(), averageColor[1].toInt(), averageColor[2].toInt())
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}
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return color
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}

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