void drawSeat() {
for (int i = 0; i < row; i++) {
for (int j = 0; j < column; j++) {
int left = j * seatBitmap.getWidth() + j * spacing;
int top = i * seatBitmap.getHeight() + i * verSpacing;
int seatType = getSeatType(i, j);
switch (seatType) {
case SEAT_TYPE_AVAILABLE:
seatCanvas.drawBitmap(seatBitmap, left, top, paint);
break;
case SEAT_TYPE_NOT_AVAILABLE:
break;
case SEAT_TYPE_SELECTED:
seatCanvas.drawBitmap(checkedSeatBitmap, left, top, paint);
break;
case SEAT_TYPE_SOLD:
seatCanvas.drawBitmap(seatSoldBitmap, left, top, paint);
break;
}
}
}
isNeedDrawSeatBitmap = false;
}

MSCALE_X MSKEW_X MTRANS_X 
MSKEW_Y MSCALE_Y MTRANS_Y 
MPERSP_0 MPERSP_1 MPERSP_2

float[] value=new float[9]; 

postScale(float sx, float sy, float px, float py) 
postTranslate(float dx, float dy) 

ScaleGestureDetector scaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.OnScaleGestureListener() {
@Override
public boolean onScale(ScaleGestureDetector detector) {
float scaleFactor = detector.getScaleFactor();
matrix.postScale(scaleFactor, scaleFactor, scaleX, scaleY);
invalidate();
return true;
}
});

@Override
public boolean onTouchEvent(MotionEvent event) {
int y = (int) event.getY();
int x = (int) event.getX();
scaleGestureDetector.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = x;
downY = y; 
break;
case MotionEvent.ACTION_MOVE:
int downDX = Math.abs(x - downX);
int downDY = Math.abs(y - downY);
if (downDX > 10 || downDY > 10) {
int dx = x - lastX;
int dy = y - lastY;
matrix.postTranslate(dx, dy);
invalidate();
}
break;
case MotionEvent.ACTION_UP:
....
break;
}
lastY = y;
lastX = x;
return true;
}

@Override
protected void onDraw(Canvas canvas) {
.....
canvas.drawBitmap(seat, matrix, paint);
.....
}

int FRAME_COUNT = 10;
int time = 15;
int count;
Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
if (count < FRAME_COUNT) {
count++;
MoveInfo moveInfo = (MoveInfo) msg.obj;
float moveXLength = moveInfo.moveXLength;
float moveYLength = moveInfo.moveYLength;
float xValue = moveXLength / FRAME_COUNT;
float yValue = moveYLength / FRAME_COUNT;
matrix.postTranslate(xValue, yValue);
invalidate();
Message message = Message.obtain();
message.obj = msg.obj;
//循環(huán)調(diào)用
handler.sendMessageDelayed(message, time);
} else {
count = 0;
}
return true;
}

Bitmap drawOverview() {
//計算概覽圖上代表座位的正方形寬度、高度 
//規(guī)則 ：座位圖上座位的寬度/縮放比例
float rectSize = seatBitmap.getHeight() / overviewScale;
//計算概覽圖的寬度和高度 
rectW = column * rectWidth + (column - 1) * overviewSpacing + overviewSpacing * 2;
rectH = row * rectSize + (row - 1) * overviewVerSpacing + overviewVerSpacing * 2;
Canvas canvas = new Canvas(overviewBitmap);
//繪制透明灰色背景
canvas.drawRect(0, 0, rectW, rectH, paint);
paint.setColor(Color.WHITE);
//循環(huán)繪制
for (int i = 0; i < row; i++) {
float top = i * rectSize + i * overviewVerSpacing + overviewVerSpacing;
for (int j = 0; j < column; j++) {
//獲取座位是什么狀態(tài) 已經(jīng)售出、未選中、已經(jīng)選中
int seatType = getSeatType(i, j);
switch (seatType) {
case SEAT_TYPE_AVAILABLE:
paint.setColor(Color.WHITE);
break;
case SEAT_TYPE_NOT_AVAILABLE:
continue;
case SEAT_TYPE_SELECTED:
paint.setColor(overview_checked);
break;
case SEAT_TYPE_SOLD:
paint.setColor(overview_sold);
break;
}
float left;
left = j * rectWidth + j * overviewSpacing + overviewSpacing;
canvas.drawRect(left, top, left + rectWidth, top + rectSize, paint);
}
}
return overviewBitmap;
}

/**
* 繪制概覽圖
*/
void drawOverviewBorder(Canvas canvas) {
//繪制紅色框
int left = (int) -getTranslateX();//獲取當(dāng)前座位圖x軸上的平移位置
if (left < 0) {
left = 0;
}
left /= overviewScale; //overviewScale 表示概覽圖占座位圖的比例
left /= getMatrixScaleX();//getMatrixScaleX() 獲取當(dāng)前座位圖的縮放比例
//判斷當(dāng)前座位圖的寬度是否超出 整個控件的寬度，如果超出了，那么超出的部分就看不見。表示當(dāng)前能看到的位置的紅色方框就不能把超出的部分框進(jìn)來。
int currentWidth = (int) (getTranslateX() + (column * seatBitmap.getWidth() + spacing * (column - 1)) * getMatrixScaleX());
if (currentWidth > getWidth()) {
currentWidth = currentWidth - getWidth();
} else {
currentWidth = 0;
}
int right = (int) (rectW - currentWidth / overviewScale / getMatrixScaleX());
float top = -getTranslateY()+headHeight;
if (top < 0) {
top = 0;
}
top /= overviewScale;
top /= getMatrixScaleY();
if (top > 0) {
top += overviewVerSpacing;
}
//判斷當(dāng)前座位圖的寬度是否超出 整個控件的高度，如果超出了，那么超出的部分就看不見。表示當(dāng)前能看到的位置的紅色方框就不能把超出的部分框進(jìn)來。
int currentHeight = (int) (getTranslateY() + (row * seatBitmap.getHeight() + verSpacing * (row - 1)) * getMatrixScaleY());
if (currentHeight > getHeight()) {
currentHeight = currentHeight - getHeight();
} else {
currentHeight = 0;
}
int bottom = (int) (rectH - currentHeight / overviewScale / getMatrixScaleY());
canvas.drawRect(left, top, right, bottom, redBorderPaint);
}