191029 안드로이드 수업과제

	package com.example.a1029;
	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.util.AttributeSet;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.Button;
	import android.widget.EditText;
	import android.os.Bundle;
	import android.widget.LinearLayout;
	import org.w3c.dom.Attr;
	import java.util.ArrayList;
	public class MainActivity extends AppCompatActivity implements View.OnClickListener {
	public MyView vw; //**
	int lineColor;
	int eraseflag = 0;
	ArrayList<Vertex> arVertex;
	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	vw = new MyView(this);
	vw.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 640));
	lineColor = Color.BLUE;
	LinearLayout layout0 = new LinearLayout(this);
	layout0.setOrientation(LinearLayout.VERTICAL);
	layout0.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
	layout0.setGravity(0x01);
	LinearLayout layout1 = new LinearLayout(this);
	layout1.setOrientation(LinearLayout.HORIZONTAL);
	layout1.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
	layout1.setGravity(0x01);
	LinearLayout layout2 = new LinearLayout(this);
	layout2.setOrientation(LinearLayout.HORIZONTAL);
	layout2.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
	layout2.setGravity(0x01);
	LinearLayout layout3 = new LinearLayout(this);
	layout3.setOrientation(LinearLayout.HORIZONTAL);
	layout3.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
	layout3.setGravity(0x01);
	Button bt_up = new Button(this);
	bt_up.setLayoutParams(new ViewGroup.LayoutParams(200, ViewGroup.LayoutParams.MATCH_PARENT));
	bt_up.setText("up");
	bt_up.setId((int) 1);
	Button bt_left = new Button(this);
	bt_left.setLayoutParams(new ViewGroup.LayoutParams(200, ViewGroup.LayoutParams.MATCH_PARENT));
	bt_left.setText("left");
	bt_left.setId((int) 2);
	Button bt_color = new Button(this);
	bt_color.setLayoutParams(new ViewGroup.LayoutParams(200, ViewGroup.LayoutParams.MATCH_PARENT));
	bt_color.setText("Color");
	bt_color.setId((int) 3);
	Button bt_right = new Button(this);
	bt_right.setLayoutParams(new ViewGroup.LayoutParams(200, ViewGroup.LayoutParams.MATCH_PARENT));
	bt_right.setText("right");
	bt_right.setId((int) 4);
	Button bt_down = new Button(this);
	bt_down.setLayoutParams(new ViewGroup.LayoutParams(200, ViewGroup.LayoutParams.MATCH_PARENT));
	bt_down.setText("down");
	bt_down.setId((int) 5);
	bt_up.setOnClickListener(this);
	bt_left.setOnClickListener(this);
	bt_color.setOnClickListener(this);
	bt_right.setOnClickListener(this);
	bt_down.setOnClickListener(this);
	layout0.addView(vw); //vw : 내가 만든 view (캔버스)
	layout0.addView(layout1); //버튼 레이아웃 상단
	layout0.addView(layout2); //버튼 레이아웃 중앙
	layout0.addView(layout3); //버튼 레이아웃 하단
	layout1.addView(bt_up);
	layout2.addView(bt_left);
	layout2.addView(bt_color);
	layout2.addView(bt_right);
	layout3.addView(bt_down);
	setContentView(layout0);
	arVertex = new ArrayList<Vertex>();
	arVertex.clear();
	arVertex.add(new Vertex(250, 250, false, lineColor)); //**
	}
	public class Vertex {
	Vertex(float ax, float ay, boolean ad, int color) {
	x = ax; //Vertex의 생성자 함수, 클래스 생성시 한번만 불림
	y = ay; //생성자가 불릴 때마다 좌표를 가져옴
	Draw = ad;
	Color = color;
	}
	float x;
	float y;
	boolean Draw; //점만 찍을 땐 False,
	int Color;
	}
	public void onClick(View v) {
	switch (v.getId()) {
	case 1:
	if (vw.mY > 25) vw.mY -= 5;
	arVertex.add(new Vertex(vw.mX, vw.mY, true, lineColor));
	eraseflag = 0;
	vw.invalidate();
	break;
	case 2:
	if (vw.mX > 25) vw.mX -= 5;
	arVertex.add(new Vertex(vw.mX, vw.mY, true, lineColor));
	eraseflag = 0;
	vw.invalidate();
	break;
	case 3:
	if (vw.cColor == Color.BLUE) {
	vw.cColor = Color.RED;
	lineColor = Color.RED;
	eraseflag++;
	} else {
	vw.cColor = Color.BLUE;
	lineColor = Color.BLUE;
	eraseflag++;
	}
	if(eraseflag == 2){
	arVertex.clear();
	arVertex.add(new Vertex(vw.mX, vw.mY, false, lineColor)); //**
	eraseflag = 0;
	}
	vw.invalidate();
	break;
	case 4:
	if (vw.mX < 500 - 35) vw.mX += 5;
	arVertex.add(new Vertex(vw.mX, vw.mY, true, lineColor));
	eraseflag = 0;
	vw.invalidate();
	break;
	case 5:
	if (vw.mY < 500 - 25) vw.mY += 5;
	arVertex.add(new Vertex(vw.mX, vw.mY, true, lineColor));
	eraseflag = 0;
	vw.invalidate();
	break;
	}
	}
	class MyView extends View {
	float mX, mY;
	int cColor;
	Paint mPaint;
	public MyView(Context context) {
	super(context);
	mX = 250;
	mY = 250;
	cColor = Color.BLUE;
	}
	public void onDraw(Canvas canvas) {
	mPaint = new Paint();
	mPaint.setStrokeWidth(3);
	mPaint.setAntiAlias(true);
	canvas.drawColor(Color.WHITE);
	Paint Pnt = new Paint();
	Pnt.setColor(cColor);
	Pnt.setAntiAlias(true);
	canvas.drawCircle(mX, mY, 16, Pnt);
	for (int i = 0; i < arVertex.size(); i++) {
	if (arVertex.get(i).Draw) {
	mPaint.setColor(arVertex.get(i).Color);
	canvas.drawLine(arVertex.get(i - 1).x, arVertex.get(i - 1).y, arVertex.get(i).x, arVertex.get(i).y, mPaint);
	}
	}
	}
	}
	}

view raw array.java hosted with ❤ by GitHub

xml보다 java가 뷰 충돌날 일이 적어서 (실수할 일이 적어서) 할만했다

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색깔도바뀐다 재미있었다