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SmartToolFactorySmartToolFactory
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add color detecton from screen demo
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6 files changed

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‎README.md

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Original file line numberDiff line numberDiff line change
@@ -203,5 +203,6 @@ data class BrushColor(
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- [x] Add option to display colors in a dialog
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- [x] Add gradient color selection with percentage stops, linear, radial and sweep options
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- [x] Add gradient selection demo
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- [x] Add color detection from screen demo
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‎app/src/main/java/com/smarttoolfactory/composecolorpicker/MainActivity.kt

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@@ -46,6 +46,7 @@ class MainActivity : ComponentActivity() {
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private fun HomeContent() {
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val pagerState: PagerState = rememberPagerState(initialPage = 0)
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val coroutineScope = rememberCoroutineScope()
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ScrollableTabRow(
@@ -66,7 +67,7 @@ private fun HomeContent() {
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coroutineScope.launch {
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pagerState.animateScrollToPage(index)
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}
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},
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}
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)
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}
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}
@@ -79,12 +80,13 @@ private fun HomeContent() {
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when (page) {
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0 -> ColorPickerDemo()
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1 -> ColorAndGradientPickerDemo()
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2 -> SaturationSelectorDemo()
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3 -> GradientSelectionDemo()
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4 -> GradientAngleDemo()
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5 -> HSVHSLGradientDemo()
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6 -> ColorfulSliderDemo()
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7 -> HexConversionDemo()
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2 -> GradientSelectionDemo()
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3 -> ColorDetectionFromScreenDemo()
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4 -> HexConversionDemo()
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5 -> GradientAngleDemo()
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6 -> SaturationSelectorDemo()
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7 -> HSVHSLGradientDemo()
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8 -> ColorfulSliderDemo()
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else -> ColorModeConversionDemo()
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}
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}
@@ -94,11 +96,12 @@ internal val tabList =
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listOf(
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"Color Picker",
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"Gradient Color Picker",
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"Saturation Selector",
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"Gradient Selection",
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"Detect Screen Color",
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"Hex Conversions",
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"Gradient Angle",
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"Saturation Selector",
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"HSV&HSL Gradients",
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"Colorful Sliders",
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"Hex Conversions",
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"Color Mode Conversions"
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)

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

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@@ -0,0 +1,217 @@
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package com.smarttoolfactory.composecolorpicker.demo
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import android.graphics.Bitmap
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import android.graphics.Canvas
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import androidx.compose.foundation.*
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import androidx.compose.foundation.gestures.detectDragGestures
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import androidx.compose.foundation.layout.*
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import androidx.compose.foundation.shape.RoundedCornerShape
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import androidx.compose.material.Button
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import androidx.compose.material.Text
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import androidx.compose.runtime.*
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.clip
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import androidx.compose.ui.draw.drawWithContent
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import androidx.compose.ui.geometry.Offset
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import androidx.compose.ui.geometry.Rect
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.graphics.ImageBitmap
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import androidx.compose.ui.graphics.drawscope.Stroke
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import androidx.compose.ui.graphics.isUnspecified
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import androidx.compose.ui.input.pointer.PointerInputChange
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import androidx.compose.ui.input.pointer.pointerInput
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import androidx.compose.ui.layout.*
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.platform.LocalView
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import androidx.compose.ui.res.imageResource
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import androidx.compose.ui.unit.dp
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import androidx.compose.ui.unit.sp
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import com.smarttoolfactory.colorpicker.ui.Blue400
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import com.smarttoolfactory.composecolorpicker.R
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@Composable
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fun ColorDetectionFromScreenDemo() {
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// These are for debugging
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var text by remember { mutableStateOf("") }
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var colorAtTouchPosition by remember { mutableStateOf(Color.Unspecified) }
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Column(
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modifier = Modifier
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.fillMaxSize()
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.verticalScroll(rememberScrollState())
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) {
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Box(
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modifier = Modifier
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.fillMaxWidth()
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.height(100.dp)
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)
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Text(
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text = "Simple demonstration to detect colors in ImageColorDetection composable " +
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"covered with green border. Bitmap of the composable is created when after " +
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"globally positioned",
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fontSize = 14.sp,
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color = Blue400,
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modifier = Modifier.padding(2.dp)
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)
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ImageColorDetection(
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modifier=Modifier.padding(10.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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) {
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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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),
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contentDescription = null,
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modifier = Modifier
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.background(Color.LightGray)
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.fillMaxWidth()
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// This is for displaying different ratio, optional
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.aspectRatio(4f / 3),
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contentScale = ContentScale.Crop
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)
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Button(onClick = { /*TODO*/ }) {
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Text("Sample Button")
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}
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}
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},
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{ colorChange: Color, textChange: String ->
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colorAtTouchPosition = colorChange
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text = textChange
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},
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)
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Text(text = text)
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Box(
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modifier = Modifier
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.then(
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if (colorAtTouchPosition.isUnspecified) {
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Modifier
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} else {
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Modifier
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.clip(RoundedCornerShape(20))
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.border(2.dp, Color.Black, shape = RoundedCornerShape(20))
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.background(colorAtTouchPosition)
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}
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)
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.size(100.dp)
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)
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}
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}
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@Composable
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private fun ImageColorDetection(
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modifier: Modifier=Modifier,
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content: @Composable () -> Unit,
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onColorChange: (Color, String) -> Unit,
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) {
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val view = LocalView.current
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var offsetX by remember { mutableStateOf(0f) }
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var offsetY by remember { mutableStateOf(0f) }
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var color by remember { mutableStateOf(Color.Unspecified) }
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var composableBounds by remember {
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mutableStateOf<Rect?>(null)
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}
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var bitmap by remember {
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mutableStateOf<Bitmap?>(
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null
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)
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}
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DisposableEffect(Unit) {
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onDispose {
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bitmap?.apply {
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if (!isRecycled) recycle()
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bitmap = null
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}
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}
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}
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val colorDetectionModifier = modifier
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.pointerInput(Unit) {
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detectDragGestures(onDrag = { change: PointerInputChange, _: Offset ->
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if (composableBounds == null) return@detectDragGestures
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if (bitmap == null) {
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val boundsRect = composableBounds!!
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bitmap = Bitmap.createBitmap(
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boundsRect.width.toInt(),
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boundsRect.height.toInt(),
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Bitmap.Config.ARGB_8888
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)
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bitmap?.let { bmp ->
162+
val canvas = Canvas(bmp)
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.apply {
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translate(-boundsRect.left, -boundsRect.top)
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}
166+
view.draw(canvas)
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}
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}
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val bmp: Bitmap = bitmap!!
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val bitmapWidth = bmp.width
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val bitmapHeight = bmp.height
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174+
// Touch coordinates on image
175+
offsetX = change.position.x.coerceIn(0f, bitmapWidth.toFloat())
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offsetY = change.position.y.coerceIn(0f, bitmapHeight.toFloat())
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// Scale from Image touch coordinates to range in Bitmap
179+
val scaledX = offsetX
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val scaledY = offsetY
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try {
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val pixel: Int = bmp.getPixel(scaledX.toInt(), scaledY.toInt())
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val red = android.graphics.Color.red(pixel)
186+
val green = android.graphics.Color.green(pixel)
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val blue = android.graphics.Color.blue(pixel)
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val text = "Touch offsetX:$offsetX, offsetY: $offsetY\n" +
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"Bitmap width: ${bitmapWidth}, height: $bitmapHeight\n" +
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"scaledX: $scaledX, scaledY: $scaledY\n" +
192+
"red: $red, green: $green, blue: $blue\n"
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194+
color = Color(red, green, blue)
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onColorChange(color, text)
197+
} catch (e: Exception) {
198+
println("Exception e: ${e.message}")
199+
}
200+
}
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)
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}
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.drawWithContent {
204+
drawContent()
205+
val center = Offset(offsetX, offsetY)
206+
drawCircle(Color.Black, radius = 20f, style = Stroke(16f), center = center)
207+
drawCircle(Color.White, radius = 20f, style = Stroke(14f), center = center)
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}
209+
.onGloballyPositioned {
210+
composableBounds = it.boundsInRoot()
211+
}
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213+
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Column(modifier = colorDetectionModifier) {
215+
content()
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}
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}

‎app/src/main/res/drawable/landscape.jpeg

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