貝茲路徑學習 android

最近在學貝茲路徑，在網上找了些文章，感覺都不怎麼樣，就在前輩的基礎上進行了些修改。下面貼出代碼：

【改天貼上很美的】

MySurfaceView.java

package mojia.main;import java.util.Random;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.Paint.Style;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback, Runnable {private SurfaceHolder sfh;private Paint paint;private Canvas canvas;private Thread th;private boolean flag = true;private int startX, startY, controlX, controlY, endX, endY;private Path path;private Paint paintQ;private Random random;public MySurfaceView(Context context) {super(context);// TODO Auto-generated constructor stubsfh = getHolder();sfh.addCallback(this);path = new Path();paintQ = new Paint();paintQ.setAntiAlias(true);paintQ.setStyle(Style.STROKE);paintQ.setStrokeWidth(5);paintQ.setColor(Color.WHITE);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubpaint = new Paint();paint.setAntiAlias(true);th = new Thread(this);flag = true;th.start();}private void myDraw() {// TODO Auto-generated method stubcanvas = sfh.lockCanvas();canvas.drawColor(Color.BLACK);drawQpath(canvas);sfh.unlockCanvasAndPost(canvas);}//繪製貝茲路徑public void drawQpath(Canvas canvas) {path.reset();path.moveTo(startX, startY);path.quadTo(controlX, controlY, endX, endY);canvas.drawPath(path, paintQ);}//響應觸控螢幕事件，通過手指的位置取得兩個重要的點，起始點，和終止點@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubif (event.getAction() == MotionEvent.ACTION_DOWN) {startX = (int) event.getX();startY = (int) event.getY();}if (event.getAction() == MotionEvent.ACTION_MOVE) {endX = (int) event.getX();endY = (int) event.getY();}return true;}//通過起始點和終止點構造控制點private void logic() {if (endX != 0 && endY != 0) {controlX = ((endX - startX) / 2);controlY = ((endY + startY) / 2);}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stubflag = false;}//線程run，刷屏得到貝茲路徑@Overridepublic void run() {// TODO Auto-generated method stubwhile (flag) {long startTime = System.currentTimeMillis();myDraw();logic();long endTime = System.currentTimeMillis();if ((endTime - startTime < 50)) {try {Thread.currentThread().sleep(50 - (endTime - startTime));} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}

下面就是ACTIVITY了

package mojia.main;import android.app.Activity;import android.os.Bundle;public class BezierCrueDemoActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(new MySurfaceView(this));    }}