Sunday, April 18, 2021

jetpack compose - Canvas withTransform

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.*
import androidx.compose.ui.graphics.drawscope.withTransform
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            MainContent()
        }
    }


    @Composable
    fun MainContent(){
        Canvas(
            modifier = Modifier
                .fillMaxSize()
                .background(Color(0xFFDEB887))
        )
        {
            val padding = 40.dp.toPx()

            withTransform(
                {
                    translate(
                        left = padding,
                        top = padding
                    )
                    rotate(45F)
                }
            ){
                drawRect(
                    color = Color(0xFFCB4154),
                    topLeft = Offset(
                        x = 0F,
                        y = size.height/2 - 75.dp.toPx()
                    ),
                    size = Size(
                        width = size.width - 100.dp.toPx(),
                        height = 50.dp.toPx()
                    )
                )

                drawRect(
                    color = Color(0xFF7BB661),
                    topLeft = Offset(
                        x = 0F,
                        y = size.height/2 +25.dp.toPx()
                    ),
                    size = Size(
                        width = size.width - 100.dp.toPx(),
                        height = 50.dp.toPx()
                    )
                )
            }
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //MainContent()
    }
}