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package net.micode.notes;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.Iterator;
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import android.app.Activity;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Path;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.view.MotionEvent;
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import android.view.View;
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/**
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*
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* @category: View实现涂鸦、撤销以及重做功能
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* @author: dingruihua
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* @date: 2022.10.10
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*
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*/
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public class PaintView extends View {
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private Canvas mCanvas;
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private Path mPath;
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private Paint mBitmapPaint;
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private Bitmap mBitmap;
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private Paint mPaint;
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private ArrayList<DrawPath> savePath;
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private ArrayList<DrawPath> deletePath;
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private DrawPath dp;
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private float mX, mY;
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private static final float TOUCH_TOLERANCE = 4;
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private int bitmapWidth;
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private int bitmapHeight;
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public PaintView(Context c) {
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super(c);
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//得到屏幕的分辨率
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DisplayMetrics dm = new DisplayMetrics();
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((Activity) c).getWindowManager().getDefaultDisplay().getMetrics(dm);
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bitmapWidth = dm.widthPixels;
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bitmapHeight = dm.heightPixels - 2 * 45;
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initCanvas();
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savePath = new ArrayList<DrawPath>();
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deletePath = new ArrayList<DrawPath>();
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}
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public PaintView(Context c, AttributeSet attrs) {
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super(c,attrs);
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//得到屏幕的分辨率
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DisplayMetrics dm = new DisplayMetrics();
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((Activity) c).getWindowManager().getDefaultDisplay().getMetrics(dm);
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bitmapWidth = dm.widthPixels;
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bitmapHeight = dm.heightPixels - 2 * 45;
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initCanvas();
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savePath = new ArrayList<DrawPath>();
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deletePath = new ArrayList<DrawPath>();
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}
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//初始化画布
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public void initCanvas(){
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mPaint = new Paint();
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mPaint.setAntiAlias(true);
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mPaint.setDither(true);
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mPaint.setColor(0xFF00FF00);
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mPaint.setStyle(Paint.Style.STROKE);
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mPaint.setStrokeJoin(Paint.Join.ROUND);
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mPaint.setStrokeCap(Paint.Cap.ROUND);
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mPaint.setStrokeWidth(10);
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mBitmapPaint = new Paint(Paint.DITHER_FLAG);
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//画布大小
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mBitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight,
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Bitmap.Config.RGB_565);
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mCanvas = new Canvas(mBitmap); //所有mCanvas画的东西都被保存在了mBitmap中
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mCanvas.drawColor(Color.WHITE);
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mPath = new Path();
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mBitmapPaint = new Paint(Paint.DITHER_FLAG);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); //显示旧的画布
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if (mPath != null) {
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// 实时的显示
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canvas.drawPath(mPath, mPaint);
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}
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}
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//路径对象
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class DrawPath{
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Path path;
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Paint paint;
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}
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/**
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* 撤销的核心思想就是将画布清空，
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* 将保存下来的Path路径最后一个移除掉，
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* 重新将路径画在画布上面。
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*/
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public void undo(){
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System.out.println(savePath.size()+"--------------");
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if(savePath != null && savePath.size() > 0){
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//调用初始化画布函数以清空画布
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initCanvas();
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//将路径保存列表中的最后一个元素删除 ,并将其保存在路径删除列表中
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DrawPath drawPath = savePath.get(savePath.size() - 1);
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deletePath.add(drawPath);
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savePath.remove(savePath.size() - 1);
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//将路径保存列表中的路径重绘在画布上
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Iterator<DrawPath> iter = savePath.iterator(); //重复保存
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while (iter.hasNext()) {
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DrawPath dp = iter.next();
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mCanvas.drawPath(dp.path, dp.paint);
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}
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invalidate();// 刷新
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}
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}
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/**
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* 恢复的核心思想就是将撤销的路径保存到另外一个列表里面(栈)，
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* 然后从redo的列表里面取出最顶端对象，
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* 画在画布上面即可
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*/
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public void redo(){
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if(deletePath.size() > 0){
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//将删除的路径列表中的最后一个，也就是最顶端路径取出（栈）,并加入路径保存列表中
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DrawPath dp = deletePath.get(deletePath.size() - 1);
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savePath.add(dp);
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//将取出的路径重绘在画布上
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mCanvas.drawPath(dp.path, dp.paint);
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//将该路径从删除的路径列表中去除
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deletePath.remove(deletePath.size() - 1);
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invalidate();
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}
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}
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/*
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* 清空的主要思想就是初始化画布
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* 将保存路径的两个List清空
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* */
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public void removeAllPaint(){
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//调用初始化画布函数以清空画布
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initCanvas();
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invalidate();//刷新
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savePath.clear();
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deletePath.clear();
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}
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/*
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* 保存所绘图形
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* 返回绘图文件的存储路径
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*
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public String saveBitmap(){
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//获得系统当前时间，并以该时间作为文件名
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SimpleDateFormat formatter = new SimpleDateFormat ("yyyyMMddHHmmss");
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Date curDate = new Date(System.currentTimeMillis());//获取当前时间
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String str = formatter.format(curDate);
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String paintPath = "";
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str = str + "paint.png";
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File dir = new File("/sdcard/notes/");
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File file = new File("/sdcard/notes/",str);
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if (!dir.exists()) {
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dir.mkdir();
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}
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else{
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if(file.exists()){
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file.delete();
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}
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}
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try {
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FileOutputStream out = new FileOutputStream(file);
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mBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
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out.flush();
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out.close();
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//保存绘图文件路径
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paintPath = "/sdcard/notes/" + str;
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} catch (FileNotFoundException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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return paintPath;
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}*/
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private void touch_start(float x, float y) {
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mPath.reset();//清空path
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mPath.moveTo(x, y);
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mX = x;
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mY = y;
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}
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private void touch_move(float x, float y) {
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float dx = Math.abs(x - mX);
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float dy = Math.abs(y - mY);
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if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
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//mPath.quadTo(mX, mY, x, y);
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mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);//源代码是这样写的，可是我没有弄明白，为什么要这样？
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mX = x;
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mY = y;
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}
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}
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private void touch_up() {
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mPath.lineTo(mX, mY);
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mCanvas.drawPath(mPath, mPaint);
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savePath.add(dp);
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mPath = null;
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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float x = event.getX();
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float y = event.getY();
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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mPath = new Path();
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dp = new DrawPath();
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dp.path = mPath;
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dp.paint = mPaint;
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touch_start(x, y);
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invalidate(); //清屏
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break;
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case MotionEvent.ACTION_MOVE:
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touch_move(x, y);
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invalidate();
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break;
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case MotionEvent.ACTION_UP:
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touch_up();
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invalidate();
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break;
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}
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return true;
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}
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}
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