| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * 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 androidx.ui.core.demos |
| |
| import androidx.compose.runtime.Composable |
| import androidx.ui.core.Alignment |
| import androidx.ui.core.Modifier |
| import androidx.compose.foundation.Canvas |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.ui.graphics.drawscope.inset |
| import androidx.compose.ui.graphics.drawscope.rotate |
| import androidx.compose.ui.graphics.drawscope.scale |
| import androidx.compose.ui.graphics.drawscope.translate |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.wrapContentSize |
| import androidx.compose.ui.unit.dp |
| |
| @Composable |
| fun DeclarativeGraphicsDemo() { |
| /** |
| * Demo that shows how to leverage DrawScope to draw 4 rectangular quadrants |
| * inset by a given dimension with a diamond drawn within each of the quadrants |
| */ |
| Canvas(modifier = |
| Modifier.fillMaxSize() |
| .wrapContentSize(Alignment.Center) |
| .preferredSize(120.dp, 120.dp) |
| ) { |
| drawRect(color = Color.Gray) |
| // Inset content by 10 pixels on the left/right sides and 12 by the |
| // top/bottom |
| inset(10.0f, 12.0f) { |
| val quadrantSize = size / 2.0f |
| drawRect( |
| size = quadrantSize, |
| color = Color.Red |
| ) |
| // Scale the drawing environment down by 50% about the center of the square drawn |
| // in the top left quadrant |
| scale(0.5f, 0.5f, size.width / 4, size.height / 4) { |
| // Rotate the drawing environment 45 degrees about the center of the square |
| // drawn in the top left |
| rotate(45.0f, size.width / 4, size.height / 4) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Yellow, |
| alpha = 0.75f |
| ) |
| } |
| } |
| // Translate the drawing environment to the right by half the size of the current |
| // width |
| translate(size.width / 2, 0.0f) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Yellow |
| ) |
| // Scale the drawing environment down by 50% about the center of the square drawn |
| // in the top right quadrant |
| scale(0.5f, 0.5f, size.width / 4, size.height / 4) { |
| // rotate the drawing environment 45 degrees about the center of the drawn |
| // square in the top right |
| rotate(45.0f, size.width / 4, size.height / 4) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Red, |
| alpha = 0.75f |
| ) |
| } |
| } |
| } |
| // Translate the drawing environment down by half the size of the current height |
| translate(0.0f, size.height / 2) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Green |
| ) |
| // Scale the drawing environment down by 50% about the center of the square drawn |
| // in the bottom left quadrant |
| scale(0.5f, 0.5f, size.width / 4, size.height / 4) { |
| // Rotate the drawing environment by 45 degrees about the center of the |
| // square drawn in the bottom left quadrant |
| rotate(45.0f, size.width / 4, size.height / 4) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Blue, |
| alpha = 0.75f |
| ) |
| } |
| } |
| } |
| // Translate the drawing environment to the bottom right quadrant of the inset bounds |
| translate(size.width / 2, size.height / 2) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Blue |
| ) |
| // Scale the drawing environment down by 50% about the center of the square drawn |
| // in the bottom right quadrant |
| scale(0.5f, 0.5f, size.width / 4, size.height / 4) { |
| // Rotate the drawing environment 45 degrees about the center of the drawn |
| // square in the bottom right |
| rotate(45.0f, size.width / 4, size.height / 4) { |
| drawRect( |
| size = quadrantSize, |
| color = Color.Green, |
| alpha = 0.75f |
| ) |
| } |
| } |
| } |
| } |
| } |
| } |