写了一个简单的画板箭头比较难搞虚线虚直线实线实直线椭圆圆正方形

1. 下载图片

  public Runnable saveFileRunnable = new Runnable() {@Overridepublic void run() {try {if (!TextUtils.isEmpty(filePath)) { //网络图片// 对资源链接URL url = new URL(filePath);//打开输入流InputStream inputStream = url.openStream();//对网上资源进行下载转换位图图片mBitmap = BitmapFactory.decodeStream(inputStream);
//                    mBitmap = zoomImg(mBitmap, 1920, 1104);//设置修改图片大小mBitmap = zoomImg(mBitmap, mBitmap.getWidth()*2, mBitmap.getHeight()*2);inputStream.close();}saveFile(mBitmap);mSaveMessage = "图片保存成功！";} catch (IOException e) {mSaveMessage = "图片保存失败！";e.printStackTrace();} catch (Exception e) {e.printStackTrace();}messageHandler.sendMessage(messageHandler.obtainMessage());}};private Handler messageHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {Log.i("pathq",""+pathq);}};

2. 加载画板

    private ArrayList<Word> words = new ArrayList<Word>();private ArrayList<CirclePath> circlePaths = new ArrayList<CirclePath>();private ArrayList<RectPath> rectPaths = new ArrayList<RectPath>();private ArrayList<OvalPath> ovalPaths = new ArrayList<OvalPath>();private ArrayList<ArrowPath> arrowPaths = new ArrayList<ArrowPath>();private ArrayList<LinexuPath> linexuPaths = new ArrayList<LinexuPath>();private ArrayList<LinexuPath> linezhiPaths = new ArrayList<LinexuPath>();private ArrayList<LinePath> linePaths = new ArrayList<LinePath>();private ArrayList<XuPath> XuPaths = new ArrayList<XuPath>();private boolean canDraw;private PopupWindow popupWindow;private LinePath currentLinPath;private XuPath xuLinPath;private CirclePath currentCirclePath;private RectPath currentRectPath;private OvalPath currentOvalPath;private ArrowPath currentArrowPath;private LinexuPath linexuPath;private Paint mPaint;private Path mPathssa;private Path mPath;private Matrix matrix = new Matrix();private GestureDetector detector;public CameraSurfaceView(Context context) {super(context);init(context);}public CameraSurfaceView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public CameraSurfaceView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init(context);}private void init(Context context) {paint = new Paint();paint.setColor(Color.RED);paint.setStrokeWidth(2);paint.setStyle(Style.STROKE);paint.setTextSize(25);paint.setAntiAlias(true);detector = new GestureDetector(listener);}private Paint eraserPaint;private boolean isEraserModel;private SimpleOnGestureListener listener = new SimpleOnGestureListener() {public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {float[] value = new float[9];matrix.getValues(value);float maxTranX = mBitmap.getWidth() * value[Matrix.MSCALE_X] - getWidth();float maxTranY = mBitmap.getHeight() * value[Matrix.MSCALE_X] - getHeight();if (value[Matrix.MSCALE_X] >= MIN_SCALE) {float dx = -distanceX + value[Matrix.MTRANS_X];//计算出实际会偏移的量float dy = -distanceY + value[Matrix.MTRANS_Y];if (dx > 0) {//如果实际量超出边框就就把相对偏移量为零dx = 0;} else if (-dx > maxTranX) {dx = 0;} else {dx = -distanceX;}if (dy > 0) {dy = 0;} else if (-dy > maxTranY) {dy = 0;} else {dy = -distanceY;}matrix.postTranslate(dx, dy);Log.i(TAG, "onScroll" + dx + ":" + dy + "mBitmap.getHeight()" + mBitmap.getHeight() + "value[Matrix.MSCALE_X]" + value[Matrix.MSCALE_X]);post(CameraSurfaceView.this);return true;}return false;}public boolean onDoubleTap(MotionEvent e) {Log.i(TAG, "onDoubleTap");float[] value = new float[9];matrix.getValues(value);if (value[Matrix.MSCALE_X] > MIN_SCALE) {matrix.reset();} else {float px = e.getX();float py = e.getY();float sx = MAX_SCALE / value[Matrix.MSCALE_X];float sy = MAX_SCALE / value[Matrix.MSCALE_Y];matrix.postScale(sx, sy, px, py);}post(CameraSurfaceView.this);return true;}};private float mOldDist = 0;@SuppressLint("ClickableViewAccessibility")@Overridepublic boolean onTouchEvent(MotionEvent event) {if (canDraw) {switch (currentDraw) {case DRAW_PATH:lineEvevn(event);break;case DRAW_WORD:wordEven(event);break;case DRAW_CIRCLE:circleEvent(event);break;case DRAW_RECT:rectEvent(event);break;case DRAW_ARROW:arrowEvent(event);break;case DRAW_OVAL:ovalEvent(event);break;case DRAW_NOTHING:if (!nothingEvent(event)) {detector.onTouchEvent(event);}break;case xu:ovalEvent2(event);break;case zhi:ovalEvent3(event);break;case zhilin :ovalEvent4(event);break;default:break;}return true;}return super.onTouchEvent(event);}private void ovalEvent2(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mPathssa = new Path();event.getX();xuLinPath = new XuPath(new Path(), new Paint(paint));xuLinPath.getPath().moveTo(event.getX(), event.getY());pathTo2(event);break;case MotionEvent.ACTION_MOVE:xuLinPath.getPath().lineTo(event.getX(), event.getY());pathTo2(event);break;case MotionEvent.ACTION_UP:pathTo2(event);xuLinPath.setPath(mPathssa);XuPaths.add(xuLinPath);xuLinPath = null;mPathssa = null;break;default:break;}post(this);}private void ovalEvent3(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mPathssa = new Path();Paint cPaint = new Paint(paint);linexuPath = new LinexuPath((int) event.getX(), (int) event.getY(), (int) event.getX() + 1, (int) event.getY() + 1, cPaint);
//                linexuPath.getPath().moveTo(event.getX(), event.getY());//                pathTo3(event);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();linexuPath.seteX((int) mX);linexuPath.seteY((int) mY);break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();linexuPath.seteX((int) uX);linexuPath.seteY((int) uY);linexuPath.reset(matrix);linexuPaths.add(linexuPath);linexuPath = null;break;default:break;}post(this);}private void ovalEvent4(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mPathssa = new Path();Paint cPaint = new Paint(paint);linexuPath = new LinexuPath((int) event.getX(), (int) event.getY(), (int) event.getX() + 1, (int) event.getY() + 1, cPaint);
//                linexuPath.getPath().moveTo(event.getX(), event.getY());pathTo3(event);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();linexuPath.seteX((int) mX);linexuPath.seteY((int) mY);pathTo3(event);break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();linexuPath.seteX((int) uX);linexuPath.seteY((int) uY);linexuPath.reset(matrix);linezhiPaths.add(linexuPath);linexuPath = null;break;default:break;}post(this);}/*** 缩放处理** @param event* @return*/private boolean nothingEvent(MotionEvent event) {int count = event.getPointerCount();if (count > 1) {int action = event.getAction();action = action & MotionEvent.ACTION_MASK;switch (action) {case MotionEvent.ACTION_POINTER_DOWN:Log.i(TAG, "ACTION_DOWN");mOldDist = getDistOfTowPoints(event);break;case MotionEvent.ACTION_MOVE:Log.i(TAG, "ACTION_MOVE");float mNewDist = getDistOfTowPoints(event);if (Math.abs(mNewDist - mOldDist) > 50) {float[] value = new float[9];matrix.getValues(value);Log.i(TAG, "偏移量" + value[Matrix.MTRANS_X] + ":" + value[Matrix.MTRANS_Y]);float scale = value[Matrix.MSCALE_X];//原来的放缩量float px = (event.getX(0) + event.getX(1)) / 2;float py = (event.getY(0) + event.getY(1)) / 2;if (mOldDist > mNewDist) {scale -= Math.abs(mNewDist - mOldDist) / 500f;//计算现在的放缩量Log.i(TAG, "缩小" + scale + ":" + Math.abs(mNewDist -mOldDist));} else {scale += Math.abs(mNewDist - mOldDist) / 500f;//计算现在的放缩量// Log.i(TAG, "放大" + scale);}if (scale < MIN_SCALE) {//如果放缩量小于最低的就置为最低放缩比scale = MIN_SCALE;} else if (scale > MAX_SCALE) {//如果放缩量大于最高的就置为最高放缩比scale = MAX_SCALE;}if (scale == MIN_SCALE) {//如果放缩量为最小就把矩阵重置matrix.reset();} else {scale = scale / value[Matrix.MSCALE_X];//计算出相对的放缩量，使矩阵的放缩量为放缩到计算出来的放缩量。matrix.postScale(scale, scale, px, py);}Log.i(TAG, "" + scale / value[Matrix.MSCALE_X] + ":" + Math.abs(mNewDist - mOldDist));mOldDist = mNewDist;post(this);}break;default:break;}return true;}return false;}/*** 获取两点之间的距离** @return int 返回两点间的距离*/private float getDistOfTowPoints(MotionEvent event) {float x0 = event.getX(0);float y0 = event.getY(0);float x1 = event.getX(1);float y1 = event.getY(1);float lengthX = Math.abs(x0 - x1);float lengthY = Math.abs(y0 - y1);return (float) Math.sqrt(lengthX * lengthX + lengthY * lengthY);}/*** 当画椭圆时** @param event*/private void ovalEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:Paint cPaint = new Paint(paint);RectF rectF = new RectF(event.getX(), event.getY(), event.getX() + 1, event.getY() + 1);currentOvalPath = new OvalPath(rectF, cPaint);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();currentOvalPath.getRectF().right = mX;currentOvalPath.getRectF().bottom = mY;break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();currentOvalPath.getRectF().right = uX;currentOvalPath.getRectF().bottom = uY;currentOvalPath.reset(matrix);ovalPaths.add(currentOvalPath);currentOvalPath = null;break;default:break;}post(this);}/*** 当画箭头** @param event*/private void arrowEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:Paint cPaint = new Paint(paint);currentArrowPath = new ArrowPath((int) event.getX(), (int) event.getY(), (int) event.getX() + 1, (int) event.getY() + 1, cPaint);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();currentArrowPath.seteX((int) mX);currentArrowPath.seteY((int) mY);break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();currentArrowPath.seteX((int) uX);currentArrowPath.seteY((int) uY);currentArrowPath.reset(matrix);arrowPaths.add(currentArrowPath);currentArrowPath = null;break;default:break;}post(this);}/*** 画方** @param event*/private void rectEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:currentRectPath = new RectPath();Paint cPaint = new Paint(paint);currentRectPath.setPaint(cPaint);currentRectPath.setLeft(event.getX());currentRectPath.setTop(event.getY());currentRectPath.setRight(event.getX() + 1);currentRectPath.setBottom(event.getY() + 1);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();currentRectPath.setRight(mX);currentRectPath.setBottom(mY);break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();currentRectPath.setRight(uX);currentRectPath.setBottom(uY);currentRectPath.reset(matrix);rectPaths.add(currentRectPath);currentRectPath = null;break;default:break;}post(this);}/*** 画圆** @param event*/private void circleEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:currentCirclePath = new CirclePath();currentCirclePath.setCx(event.getX());currentCirclePath.setCy(event.getY());currentCirclePath.setRadius(1);Paint cPaint = new Paint(paint);currentCirclePath.setPaint(cPaint);break;case MotionEvent.ACTION_MOVE:float mX = event.getX();float mY = event.getY();float r = (float) Math.sqrt(Math.pow(Math.abs(mX - currentCirclePath.getCx()), 2) + Math.pow(Math.abs(mY - currentCirclePath.getCy()), 2));currentCirclePath.setRadius(r);break;case MotionEvent.ACTION_UP:float uX = event.getX();float uY = event.getY();float ur = (float) Math.sqrt(Math.pow(Math.abs(uX - currentCirclePath.getCx()), 2) + Math.pow(Math.abs(uY - currentCirclePath.getCy()), 2));currentCirclePath.setRadius(ur);currentCirclePath.reset(matrix);circlePaths.add(currentCirclePath);currentCirclePath = null;break;default:break;}post(this);}/*** 写字** @param event*/private void wordEven(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:Log.i(TAG, "DRAW_WORD+ACTION_DOWN");showPop((int) event.getX(), (int) event.getY());break;default:break;}}/*** 划线** @param event*/private void lineEvevn(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mPath = new Path();currentLinPath = new LinePath(new Path(), new Paint(paint));currentLinPath.getPath().moveTo(event.getX(), event.getY());pathTo(event);break;case MotionEvent.ACTION_MOVE:currentLinPath.getPath().lineTo(event.getX(), event.getY());pathTo(event);break;case MotionEvent.ACTION_UP:pathTo(event);currentLinPath.setPath(mPath);linePaths.add(currentLinPath);currentLinPath = null;mPath = null;break;default:break;}post(this);}private void pathTo(MotionEvent event) {Point pointD = new Point((int) event.getX(), (int) event.getY());calculationRealPoint(pointD, matrix);if (event.getAction() == MotionEvent.ACTION_DOWN) {mPath.moveTo(pointD.x, pointD.y);} else {mPath.lineTo(pointD.x, pointD.y);}}private void pathTo2(MotionEvent event) {Point pointD = new Point((int) event.getX(), (int) event.getY());calculationRealPoint(pointD, matrix);if (event.getAction() == MotionEvent.ACTION_DOWN) {mPathssa.moveTo(pointD.x, pointD.y);} else {mPathssa.lineTo(pointD.x, pointD.y);}}private void pathTo3(MotionEvent event) {Point pointD = new Point((int) event.getX(), (int) event.getY());calculationRealPoint(pointD, matrix);if (event.getAction() == MotionEvent.ACTION_DOWN) {mPathssa.moveTo(pointD.x, pointD.y);} else {mPathssa.lineTo(pointD.x, pointD.y);}}public void calculationRealPoint(Point point, Matrix matrix) {float[] values = new float[9];matrix.getValues(values);int sX = point.x;int sY = point.y;point.x = (int) ((sX - values[Matrix.MTRANS_X]) / values[Matrix.MSCALE_X]);point.y = (int) ((sY - values[Matrix.MTRANS_Y]) / values[Matrix.MSCALE_Y]);}/*** 显示popupWindow输入文字** @param x* @param y*/private void showPop(final float x, final float y) {if (popupWindow != null && popupWindow.isShowing()) {popupWindow.dismiss();}View contentView = View.inflate(getContext(), R.layout.popupwindow, null);final EditText etWord = (EditText) contentView.findViewById(R.id.et_word);etWord.setInputType(InputType.TYPE_CLASS_TEXT);Button btnOk = (Button) contentView.findViewById(R.id.btn_ok);btnOk.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String word = etWord.getText().toString().trim();if (!TextUtils.isEmpty(word)) {Paint key = new Paint(paint);key.setStrokeWidth(1);key.setTypeface(Typeface.DEFAULT);key.setStyle(Style.FILL);Word wor = new Word(x, y, key, word);wor.reset(matrix);words.add(wor);post(CameraSurfaceView.this);}if (popupWindow != null && popupWindow.isShowing()) {popupWindow.dismiss();}}});popupWindow = new PopupWindow(contentView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);popupWindow.setFocusable(true);popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));// PopupWindow没有背景色，必须设置背景色popupWindow.showAtLocation(this, Gravity.TOP + Gravity.LEFT, (int) x + getLeft(), (int) y + getTop());ScaleAnimation animation = new ScaleAnimation(0.2f, 1.2f, 0.2f, 1.2f, 0.5f, 0.5f);animation.setDuration(100);// animation.setFillAfter(true);contentView.startAnimation(animation);}@Overridepublic void run() {if (mBitmap != null) {SurfaceHolder surfaceHolder = getHolder();Canvas canvas = surfaceHolder.lockCanvas();canvas.drawColor(Color.WHITE);canvas.save();canvas.setMatrix(matrix);canvas.drawBitmap(mBitmap, 0, 0, paint);//            // 指定图片绘制区域(左上角的四分之一)
//            Rect src = new Rect(0,0,1920/2,1104/2);
//            // 指定图片在屏幕上显示的区域(原图大小)
//            Rect dst = new Rect(mBitmap.getWidth()+50,0,mBitmap.getWidth()+50+mBitmap.getWidth(),mBitmap.getHeight());
//            canvas.drawBitmap(mBitmap, src,dst,null);drawText(canvas, words);drawOval(canvas, ovalPaths);drawArrow(canvas, arrowPaths);drawCircle(canvas, circlePaths);drawRect(canvas, rectPaths);drawLine(canvas, linePaths);drawxu(canvas, XuPaths);drawxian(canvas, linexuPaths);drawxian3(canvas, linezhiPaths);// canvas.save();canvas.restore();drawCurrent(canvas);surfaceHolder.unlockCanvasAndPost(canvas);}}private void drawLine(Canvas canvas, ArrayList<LinePath> linePaths2) {for (LinePath linePath : linePaths2) {canvas.drawPath(linePath.getPath(), linePath.getPaint());}}private void drawxu(Canvas canvas, ArrayList<XuPath> linePaths2) {for (XuPath linePath : linePaths2) {canvas.drawPath(linePath.getPath(), linePath.getPaint());}}private void drawxian(Canvas canvas, ArrayList<LinexuPath> linexuPath) {for (LinexuPath arrowPath : linexuPath) {drawAL1(arrowPath.getsX(), arrowPath.getsY(), arrowPath.geteX(), arrowPath.geteY(), canvas, arrowPath.getPaint());}}private void drawxian3(Canvas canvas, ArrayList<LinexuPath> linexuPath) {for (LinexuPath arrowPath : linexuPath) {drawAL1(arrowPath.getsX(), arrowPath.getsY(), arrowPath.geteX(), arrowPath.geteY(), canvas, arrowPath.getPaint());}}private void drawArrow(Canvas canvas, ArrayList<ArrowPath> arrowPaths2) {for (ArrowPath arrowPath : arrowPaths2) {drawAL(arrowPath.getsX(), arrowPath.getsY(), arrowPath.geteX(), arrowPath.geteY(), canvas, arrowPath.getPaint());}}private void drawOval(Canvas canvas, ArrayList<OvalPath> ovalPaths2) {for (OvalPath ovalPath : ovalPaths2) {canvas.drawOval(ovalPath.getRectF(), ovalPath.getPaint());}}private void drawRect(Canvas mCanvas2, ArrayList<RectPath> rectPaths2) {for (RectPath rectPath : rectPaths2) {mCanvas2.drawRect(rectPath.getLeft(), rectPath.getTop(), rectPath.getRight(), rectPath.getBottom(), rectPath.getPaint());}}private void drawCircle(Canvas mCanvas2, ArrayList<CirclePath> circlePaths2) {for (CirclePath circlePath : circlePaths2) {mCanvas2.drawCircle(circlePath.getCx(), circlePath.getCy(), circlePath.getRadius(), circlePath.getPaint());}}private void drawText(Canvas mCanvas2, ArrayList<Word> words2) {for (Word word : words2) {mCanvas2.drawText(word.getWordString(), word.getLeft(), word.getTop(), word.getPaint());}}/*** 画当前的图形** @param canvas*/private void drawCurrent(Canvas canvas) {switch (currentDraw) {case DRAW_CIRCLE:if (currentCirclePath != null) {canvas.drawCircle(currentCirclePath.getCx(), currentCirclePath.getCy(), currentCirclePath.getRadius(), currentCirclePath.getPaint());}break;case DRAW_RECT:if (currentRectPath != null) {canvas.drawRect(currentRectPath.getLeft(), currentRectPath.getTop(), currentRectPath.getRight(), currentRectPath.getBottom(), currentRectPath.getPaint());}break;case DRAW_ARROW:if (currentArrowPath != null) {drawAL(currentArrowPath.getsX(), currentArrowPath.getsY(), currentArrowPath.geteX(), currentArrowPath.geteY(), canvas, currentArrowPath.getPaint());}break;case DRAW_OVAL:if (currentOvalPath != null) {canvas.drawOval(currentOvalPath.getRectF(), currentOvalPath.getPaint());}case DRAW_PATH:if (currentLinPath != null) {canvas.drawPath(currentLinPath.getPath(), currentLinPath.getPaint());}break;case xu:if (xuLinPath != null) {DashPathEffect pathEffect = new DashPathEffect(new float[]{20, 20}, 0);xuLinPath.getPaint().setPathEffect(pathEffect);canvas.drawPath(xuLinPath.getPath(), xuLinPath.getPaint());}case zhi:if (linexuPath != null) {DashPathEffect pathEffect = new DashPathEffect(new float[]{20, 20}, 0);linexuPath.getPaint().setPathEffect(pathEffect);canvas.drawLine(linexuPath.getsX(), linexuPath.getsY(), linexuPath.geteX(), linexuPath.geteY(), linexuPath.getPaint());}break;case zhilin:if (linexuPath != null) {//                    DashPathEffect pathEffect = new DashPathEffect(new float[]{30, 30}, 0);
//
//                    linexuPath.getPaint().setPathEffect(pathEffect);canvas.drawLine(linexuPath.getsX(), linexuPath.getsY(), linexuPath.geteX(), linexuPath.geteY(), linexuPath.getPaint());}break;default:break;}}/*** 画箭头** @param sx* @param sy* @param ex* @param ey*/public void drawAL(int sx, int sy, int ex, int ey, Canvas myCanvas, Paint myPaint) {double H = 8; // 箭头高度double L = 3.5; // 底边的一半int x3 = 0;int y3 = 0;int x4 = 0;int y4 = 0;double awrad = Math.atan(L / H); // 箭头角度double arraow_len = Math.sqrt(L * L + H * H); // 箭头的长度double[] arrXY_1 = rotateVec(ex - sx, ey - sy, awrad, true, arraow_len);double[] arrXY_2 = rotateVec(ex - sx, ey - sy, -awrad, true, arraow_len);Double X3 = ex - arrXY_1[0]; // (x3,y3)是第一端点x3 = X3.intValue();Double Y3 = ey - arrXY_1[1];y3 = Y3.intValue();Double X4 = ex - arrXY_2[0]; // (x4,y4)是第二端点x4 = X4.intValue();Double Y4 = ey - arrXY_2[1];y4 = Y4.intValue();// 画线myCanvas.drawCircle(sx, sy, 2, myPaint);// 画线myCanvas.drawLine(sx, sy, ex, ey, myPaint);Path triangle = new Path();triangle.moveTo(ex, ey);triangle.lineTo(x3, y3);triangle.lineTo(x4, y4);triangle.close();myCanvas.drawPath(triangle, myPaint);}/*** 画箭头** @param sx* @param sy* @param ex* @param ey*/public void drawAL1(int sx, int sy, int ex, int ey, Canvas myCanvas, Paint myPaint) {double H = 8; // 箭头高度double L = 3.5; // 底边的一半int x3 = 0;int y3 = 0;int x4 = 0;int y4 = 0;double awrad = Math.atan(L / H); // 箭头角度double arraow_len = Math.sqrt(L * L + H * H); // 箭头的长度double[] arrXY_1 = rotateVec(ex - sx, ey - sy, awrad, true, arraow_len);double[] arrXY_2 = rotateVec(ex - sx, ey - sy, -awrad, true, arraow_len);Double X3 = ex - arrXY_1[0]; // (x3,y3)是第一端点x3 = X3.intValue();Double Y3 = ey - arrXY_1[1];y3 = Y3.intValue();Double X4 = ex - arrXY_2[0]; // (x4,y4)是第二端点x4 = X4.intValue();Double Y4 = ey - arrXY_2[1];y4 = Y4.intValue();// 画线myCanvas.drawLine(sx, sy, ex, ey, myPaint);
//        Path triangle = new Path();
//        triangle.moveTo(ex, ey);
//        triangle.lineTo(x3, y3);
//        triangle.lineTo(x4, y4);
//        triangle.close();
//        myCanvas.drawPath(triangle, myPaint);}/*** 矢量旋转函数，求出与结束定点的x，y距离** @param px      x分量* @param py      y分量* @param ang     旋转角度* @param isChLen 是否改变长度* @param newLen  新长度* @return*/public double[] rotateVec(int px, int py, double ang, boolean isChLen, double newLen) {double mathstr[] = new double[2];// double len = Math.sqrt(px*px + py*py);// double a = Math.acos(px/len);// double vx = Math.cos(a+ang)*len// double vy = Math.sin(a+ang)*lendouble vx = px * Math.cos(ang) - py * Math.sin(ang);double vy = px * Math.sin(ang) + py * Math.cos(ang);if (isChLen) {double d = Math.sqrt(vx * vx + vy * vy);vx = vx / d * newLen;vy = vy / d * newLen;mathstr[0] = vx;mathstr[1] = vy;}return mathstr;}public int getCurrentDraw() {return currentDraw;}public void setCurrentDraw(int currentDraw) {this.currentDraw = currentDraw;if (popupWindow != null && popupWindow.isShowing()) {popupWindow.dismiss();}}/*** 返回一个画完的图片** @return*/public Bitmap getmBitmap() {mCanvas = new Canvas(mBitmap);drawText(mCanvas, words);drawCircle(mCanvas, circlePaths);drawRect(mCanvas, rectPaths);drawArrow(mCanvas, arrowPaths);drawOval(mCanvas, ovalPaths);drawLine(mCanvas, linePaths);drawxu(mCanvas, XuPaths);drawxian(mCanvas, linexuPaths);drawxian3(mCanvas, linezhiPaths);return mBitmap;}public void setmBitmap(Bitmap mBitmap) {this.mBitmap = mBitmap;// mCanvas = new Canvas(this.mBitmap);// reset();post(this);}//// public void reset() {// if (bitmap != null) {// bitmap.recycle();// }// bitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(),// mBitmap.getWidth());// dCanvas = new Canvas(bitmap);// }public boolean isCanDraw() {return canDraw;}public void setCanDraw(boolean canDraw) {this.canDraw = canDraw;}/*** 清除对应的类型的最新的一个图形*/public void back() {switch (currentDraw) {case DRAW_CIRCLE:if (circlePaths.size() - 1 >= 0) {circlePaths.remove(circlePaths.size() - 1);}break;case DRAW_RECT:if (rectPaths.size() - 1 >= 0) {rectPaths.remove(rectPaths.size() - 1);}break;case DRAW_WORD:if (words.size() - 1 >= 0) {words.remove(words.size() - 1);}break;case DRAW_PATH:if (linePaths.size() - 1 >= 0) {linePaths.remove(linePaths.size() - 1);}break;case DRAW_ARROW:if (arrowPaths.size() - 1 >= 0) {arrowPaths.remove(arrowPaths.size() - 1);}break;case DRAW_OVAL:if (ovalPaths.size() - 1 >= 0) {ovalPaths.remove(ovalPaths.size() - 1);}break;case xu:if (XuPaths.size() - 1 >= 0) {XuPaths.remove(XuPaths.size() - 1);}break;case zhi:if (linexuPaths.size() - 1 >= 0) {linexuPaths.remove(linexuPaths.size() - 1);}break;case zhilin:if (linezhiPaths.size() - 1 >= 0) {linezhiPaths.remove(linezhiPaths.size() - 1);}break;case DRAW_NOTHING:Builder builder = new Builder(getContext());builder.setTitle("清除");builder.setMessage("是否要清除全部内容？");builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();words.clear();ovalPaths.clear();linePaths.clear();arrowPaths.clear();rectPaths.clear();circlePaths.clear();XuPaths.clear();linexuPaths.clear();linezhiPaths.clear();}}).setPositiveButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}}).show();break;default:break;}post(this);}public void setTextSize(float textSize) {paint.setTextSize(textSize);}public void setColor(int color) {paint.setColor(color);}

3. demo 下载地址 https://download.csdn.net/download/qq_35742975/16343900

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写了一个简单的画板箭头比较难搞虚线虚直线实线实直线椭圆圆正方形

1. 下载图片

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