[코틀린을 활용한 안드로이드 프로그래밍] 9장 직접 풀어보기 9-2

[Gradle 설정]

1

id 'kotlin-android-extensions'

cs

 

 

<MainActivity>

package com.cookandroid.project9_1
 
import android.content.Context
import android.content.res.Resources
import android.graphics.*
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.view.MotionEvent
import android.view.View
import androidx.core.graphics.scale
import com.cookandroid.project9_1.MainActivity.Companion.curShape
 
class MainActivity : AppCompatActivity() {
 
    companion object{
        const val LINE = 1
        const val CIRCLE = 2
        const val RECT = 3
        const val IMAGE = 4
        var curColor = Color.RED
        var curShape = LINE
    }
 
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(MyGraphicView(this))
        title = "간단 그림판"
 
 
    }
    private class MyGraphicView(context: Context) : View(context){
        var startX = -1
        var startY = -1
        var stopX = -1
        var stopY = -1
 
        override fun onTouchEvent(event: MotionEvent?): Boolean {
            when(event!!.action){
                MotionEvent.ACTION_DOWN ->{
                    startX = event.x.toInt()
                    startY = event.y.toInt()
                }
                MotionEvent.ACTION_MOVE, MotionEvent.ACTION_UP -> {
                    stopX = event.x.toInt()
                    stopY = event.y.toInt()
                    this.invalidate()
                }
            }
            return true
        }
 
        override fun onDraw(canvas: Canvas?) {
            super.onDraw(canvas)
            val paint = Paint()
            paint.isAntiAlias = true
            paint.style = Paint.Style.STROKE
            paint.strokeWidth = 5f
            paint.color = curColor
 
            when(curShape){
                LINE -> {
                    canvas!!.drawLine(startX.toFloat(), startY.toFloat(),
                        stopX.toFloat(), stopY.toFloat(), paint)
                }
                CIRCLE -> {
                    var radius = Math.sqrt(Math.pow((stopX - startX).toDouble() , 2.0) + Math.pow((stopY - startY).toDouble(), 2.0))
                    canvas!!.drawCircle(startX.toFloat(), startY.toFloat(), radius.toFloat(), paint)
                }
                RECT -> {
                    canvas!!.drawRect(RectF(startX.toFloat(), startY.toFloat(),
                        stopX.toFloat(), stopY.toFloat()
                    ), paint)
                }
                IMAGE -> {
                    var picture = BitmapFactory.decodeResource(resources, R.drawable.jeju14)
                    picture.scale(500, 300)
                    canvas!!.drawBitmap(picture, stopX.toFloat(), stopY.toFloat(), paint)
                }
 
            }
        }
    }
 
    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.menu1, menu)
 
        return super.onCreateOptionsMenu(menu)
    }
 
    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when(item.itemId){
            R.id.itemLine ->{
                curShape = LINE
            }
            R.id.itemCircle ->{
                curShape = CIRCLE
            }
            R.id.itemRect -> {
                curShape = RECT
            }
            R.id.itemImage -> {
                curShape = IMAGE
            }
            R.id.itemRed -> {
                curColor = Color.RED
            }
 
            R.id.itemBlue -> {
                curColor = Color.BLUE
            }
 
            R.id.itemGreen -> {
                curColor = Color.GREEN
 
            }
        }
        return super.onOptionsItemSelected(item)
    }
 
}

<menu1.xml>

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
 
 
    <item
        android:id="@+id/itemLine"
        android:title="선 그리기">
    </item>
 
    <item
        android:id="@+id/itemCircle"
        android:title="원 그리기">
    </item>
 
 
    <item
        android:id="@+id/itemRect"
        android:title="사각형 그리기">
    </item>
 
    <item
        android:id="@+id/itemImage"
        android:title="이미지 그리기">
    </item>
 
    <item
        android:id="@+id/itemColor"
        android:title="색상 변경>>">
        <menu>
            <item
                android:id="@+id/itemRed"
                android:title="빨강색">
            </item>
            <item
                android:id="@+id/itemBlue"
                android:title="파랑색">
            </item>
            <item
                android:id="@+id/itemGreen"
                android:title="초록색">
            </item>
 
 
        </menu>
 
    </item>
</menu>