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Upgrade to latest version and include graphics samples.
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app/src/main/java/dev/riggaroo/composeplaytime/BlendModes.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| package dev.riggaroo.composeplaytime | ||
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||
| import androidx.compose.animation.core.RepeatMode | ||
| import androidx.compose.animation.core.animateFloat | ||
| import androidx.compose.animation.core.infiniteRepeatable | ||
| import androidx.compose.animation.core.rememberInfiniteTransition | ||
| import androidx.compose.animation.core.tween | ||
| import androidx.compose.foundation.background | ||
| import androidx.compose.foundation.layout.Box | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.PaddingValues | ||
| import androidx.compose.foundation.layout.aspectRatio | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.foundation.layout.size | ||
| import androidx.compose.foundation.layout.wrapContentSize | ||
| import androidx.compose.foundation.pager.HorizontalPager | ||
| import androidx.compose.foundation.pager.rememberPagerState | ||
| import androidx.compose.foundation.shape.CircleShape | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.drawBehind | ||
| import androidx.compose.ui.draw.drawWithCache | ||
| import androidx.compose.ui.draw.drawWithContent | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.graphics.BlendMode | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.graphics.ColorFilter | ||
| import androidx.compose.ui.graphics.ColorMatrix | ||
| import androidx.compose.ui.graphics.CompositingStrategy | ||
| import androidx.compose.ui.graphics.graphicsLayer | ||
| import androidx.compose.ui.graphics.layer.GraphicsLayer | ||
| import androidx.compose.ui.graphics.layer.drawLayer | ||
| import androidx.compose.ui.graphics.rememberGraphicsLayer | ||
| import androidx.compose.ui.text.font.FontWeight | ||
| import androidx.compose.ui.text.style.TextAlign | ||
| import androidx.compose.ui.tooling.preview.Preview | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.compose.ui.unit.sp | ||
| import dev.riggaroo.composeplaytime.pager.PagerSampleItem | ||
| import kotlin.math.max | ||
| import kotlin.math.min | ||
|
|
||
| @Preview | ||
| @Composable | ||
| fun BlendModesExamples() { | ||
| Box() { | ||
| val startIndex = Int.MAX_VALUE / 2 | ||
| val pagerState = rememberPagerState(initialPage = startIndex, pageCount = { Int.MAX_VALUE }) | ||
| val graphicsLayer = rememberGraphicsLayer() | ||
| HorizontalPager( | ||
| state = pagerState, | ||
| contentPadding = PaddingValues(horizontal = 32.dp), | ||
| modifier = Modifier | ||
| .fillMaxWidth() | ||
| .colorFilter(ColorFilter.colorMatrix(ColorMatrix().apply { | ||
| setToSaturation(0f) | ||
| })) | ||
| ) { index -> | ||
| // We calculate the page from the given index | ||
| val page = (index - startIndex).floorMod(pagerState.pageCount) | ||
|
|
||
| PagerSampleItem( | ||
| page = page, | ||
| modifier = Modifier | ||
| .fillMaxWidth() | ||
| .aspectRatio(1f) | ||
| ) | ||
| } | ||
| val textGraphicsLayer = rememberGraphicsLayer() | ||
| Text("breaking news", | ||
| color = Color.White, | ||
| fontSize = 140.sp, | ||
| fontWeight = FontWeight.ExtraBold, | ||
| textAlign = TextAlign.Center, | ||
| modifier = Modifier | ||
| .fillMaxSize() | ||
| .padding(top = 100.dp) | ||
| .align(Alignment.Center) | ||
| .blendMode(BlendMode.Difference)) | ||
| } | ||
| } | ||
|
|
||
| private fun Int.floorMod(other: Int): Int = when (other) { | ||
| 0 -> this | ||
| else -> this - floorDiv(other) * other | ||
| } | ||
|
|
||
| fun Modifier.blendMode(blendMode: BlendMode): Modifier { | ||
| return this.drawWithCache { | ||
| val graphicsLayer = obtainGraphicsLayer() | ||
| graphicsLayer.apply { | ||
| record { | ||
| drawContent() | ||
| } | ||
| this.blendMode = blendMode | ||
| } | ||
| onDrawWithContent { | ||
| drawLayer(graphicsLayer) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun Modifier.colorFilter(colorFilter: ColorFilter): Modifier { | ||
| return this.drawWithCache { | ||
| val graphicsLayer = obtainGraphicsLayer() | ||
| graphicsLayer.apply { | ||
| record { | ||
| drawContent() | ||
| } | ||
| this.colorFilter = colorFilter | ||
| } | ||
| onDrawWithContent { | ||
| drawLayer(graphicsLayer) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Preview | ||
| @Composable | ||
| fun InvertedColorDemo() { | ||
| val infiniteTransition = rememberInfiniteTransition() | ||
| val centerX = infiniteTransition.animateFloat( | ||
| .1f, | ||
| 0.9f, | ||
| infiniteRepeatable(tween(3000), RepeatMode.Reverse) | ||
| ) | ||
| val graphicsLayerBlue = rememberGraphicsLayer() | ||
| Box(modifier = Modifier | ||
| .fillMaxSize() | ||
| .wrapContentSize(Alignment.Center) | ||
| .size(200.dp, 120.dp) | ||
| .background(Color.DarkGray, CircleShape) | ||
| /* .graphicsLayer(compositingStrategy = CompositingStrategy.Offscreen)*/ | ||
| ) { | ||
| Text( | ||
| "Inverted Colors", | ||
| color = Color.White, | ||
| fontSize = 30.sp, | ||
| modifier = Modifier | ||
| .padding(start = 30.dp) | ||
| .align(Alignment.Center) | ||
| ) | ||
|
|
||
| Box(modifier = Modifier.fillMaxSize().drawBehind { | ||
| val radius = size.minDimension / 4 | ||
| drawCircle( | ||
| Color.Cyan, | ||
| radius = radius, | ||
| center = Offset( | ||
| max(radius, min(size.width * centerX.value, size.width - radius)), | ||
| size.height / 2 | ||
| ), | ||
| ) | ||
| }.blendMode( blendMode = BlendMode.Xor)) | ||
| } | ||
| } |
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