안드로이드 프로그래밍_직접 풀어보기 9-2 코드

// JAVA Code


package com.example.example_9_2;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SubMenu;
import android.view.View;
import android.widget.Switch;

public class MainActivity extends AppCompatActivity {
    final static int LINE = 1, CIRCLE = 2, Rect = 3, Red = 4, Blue = 5, Green = 6;
    static int curShape = LINE, curColor = Red;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        setContentView(new myGraphicView(this));
    }

    private static class myGraphicView extends View {
        int startX = -1, startY = -1, stopX = -1, stopY = -1;

        public myGraphicView(Context context) {
            super(context);
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    startX = (int) event.getX();
                    startY = (int) event.getY();
                    break;
                case MotionEvent.ACTION_MOVE:
                case MotionEvent.ACTION_UP:
                    stopX = (int) event.getX();
                    stopY = (int) event.getY();
                    this.invalidate();
                    break;
            }
            return true;
        }

        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            paint.setStrokeWidth(25);
            paint.setStyle(Paint.Style.STROKE);

            switch (curColor) {
                case Red:
                    paint.setColor(Color.RED);
                    break;
                case Blue:
                    paint.setColor(Color.BLUE);
                    break;
                case Green:
                    paint.setColor(Color.GREEN);
                    break;
            }

            switch (curShape) {
                case LINE:
                    canvas.drawLine(startX, startY, stopX, stopY, paint);
                    break;
                case CIRCLE:
                    int radious = (int) Math.sqrt(Math.pow(stopX - startX, 2)
                            + Math.pow(stopY - startY, 2));
                    canvas.drawCircle(startX, startY, radious, paint);
                    break;
                case Rect:
                    canvas.drawRect(startX, startY, stopX, stopY, paint);
                    break;
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0, 1, 0, "찍 긋기");
        menu.add(0, 2, 0, "슥 긋기");
        menu.add(0, 3, 0, "챡 긋기");

        SubMenu sub = menu.addSubMenu("분위기 변경");
        sub.add(0, 4, 0, "빠가랑");
        sub.add(0, 5, 0, "파라랑");
        sub.add(0, 6, 0, "차라랑");

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case 1:
                curShape = LINE;
                return true;
            case 2:
                curShape = CIRCLE;
                return true;
            case 3:
                curShape = Rect;
                return true;
            case 4:
                curColor = Red;
                return true;
            case 5:
                curColor = Blue;
                return true;
            case 6:
                curColor = Green;
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
}