在android中获取闭合画布形状
我正在尝试用android在地图上画一个形状。如果用户绘制了一条闭合的路径,则可以。如果用户绘制了一个打开的路径,那么如何关闭该路径以使其看起来更好 请看图片 我在这里画了一条开阔的道路 一旦onTouch动作启动,路径就应该自行关闭 像这样,在android中获取闭合画布形状,android,canvas,graphics,shape,Android,Canvas,Graphics,Shape,我正在尝试用android在地图上画一个形状。如果用户绘制了一条闭合的路径,则可以。如果用户绘制了一个打开的路径,那么如何关闭该路径以使其看起来更好 请看图片 我在这里画了一条开阔的道路 一旦onTouch动作启动,路径就应该自行关闭 像这样, public boolean onTouch(View v, MotionEvent event) { int action = event.getAction(); path = new Path(); float upX;
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
path = new Path();
float upX;
float upY;
Log.d("", "OnTouch");
switch (action) {
case MotionEvent.ACTION_DOWN:
downx = event.getX();
downy = event.getY();
eventX = downx;
eventY = downy;
Log.d("", "startx" + eventX);
break;
case MotionEvent.ACTION_MOVE:
upx = event.getX();
upy = event.getY();
canvas.drawLine(downx, downy, upx, upy, paint);
drawable.invalidate();
downx = upx;
downy = upy;
break;
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
Log.d("", "Action Up");
Log.d("", "endx" + upX);
//path.moveTo(eventX, eventY);
canvas.drawLine(eventX, eventY, upX, upY, paint);
drawable.invalidate();
return true;
case MotionEvent.ACTION_CANCEL:
break;
default:
break;
}
return true;
}
有没有办法做到这一点?我已经做了裁判,
但这对我没有帮助
这是我的密码
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
Log.d("","OnTouch");
switch (action) {
case MotionEvent.ACTION_DOWN:
downx = event.getX();
downy = event.getY();
break;
case MotionEvent.ACTION_MOVE:
upx = event.getX();
upy = event.getY();
canvas.drawLine(downx, downy, upx, upy, paint);
drawable.invalidate();
downx=upx;
downy=upy;
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_CANCEL:
break;
default:
break;
}
return true;
}
请推荐我。我不完全了解这幅油画
感谢您的帮助。请尝试以下方法
public class MainActivity extends Activity {
private ArrayList<Path> _graphics = new ArrayList<Path>();
private Paint mPaint;
float x1, x2, y1, y2;
boolean isDraw;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawingPanel(this));
System.out.println(x1 + " " + x2 + " " + y1 + " " + y2);
mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(0xFFFFFF00);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(3);
}
class DrawingPanel extends SurfaceView implements SurfaceHolder.Callback {
private DrawingThread _thread;
private Path path;
public DrawingPanel(Context context) {
super(context);
getHolder().addCallback(this);
_thread = new DrawingThread(getHolder(), this);
}
public boolean onTouchEvent(MotionEvent event) {
synchronized (_thread.getSurfaceHolder()) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
path = new Path();
x1 = event.getX();
y1 = event.getY();
path.moveTo(event.getX(), event.getY());
path.lineTo(event.getX(), event.getY());
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
path.lineTo(event.getX(), event.getY());
} else if (event.getAction() == MotionEvent.ACTION_UP) {
x2 = event.getX();
y2 = event.getY();
path.lineTo(event.getX(), event.getY());
_graphics.add(path);
isDraw = true;
}
return true;
}
}
@Override
public void onDraw(Canvas canvas) {
for (Path path : _graphics) {
// canvas.drawPoint(graphic.x, graphic.y, mPaint);
canvas.drawPath(path, mPaint);
if (isDraw) {
canvas.drawLine(x1, y1, x2, y2, mPaint);
isDraw = false;
}
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
_thread.setRunning(true);
_thread.start();
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
class DrawingThread extends Thread {
private SurfaceHolder _surfaceHolder;
private DrawingPanel _panel;
private boolean _run = false;
public DrawingThread(SurfaceHolder surfaceHolder, DrawingPanel panel) {
_surfaceHolder = surfaceHolder;
_panel = panel;
}
public void setRunning(boolean run) {
_run = run;
}
public SurfaceHolder getSurfaceHolder() {
return _surfaceHolder;
}
@Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _surfaceHolder.lockCanvas(null);
synchronized (_surfaceHolder) {
_panel.onDraw(c);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
_surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
}
公共类MainActivity扩展活动{
private ArrayList_graphics=new ArrayList();
私人油漆;
浮球x1、x2、y1、y2;
布尔isDraw;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(新绘图面板(本));
系统输出打印LN(x1+“”+x2+“”+y1+“”+y2);
mPaint=新油漆();
mPaint.setDither(true);
mPaint.setColor(0xFFFFFF00);
mPaint.setStyle(油漆、样式、笔划);
mPaint.setStrokeJoin(油漆.连接.圆形);
mPaint.setStrokeCap(油漆盖圆形);
mPaint.设定行程宽度(3);
}
类DrawingPanel扩展SurfaceView实现SurfaceHolder.Callback{
私有DrawingThread\u线程;
专用路径;
公共绘图面板(上下文){
超级(上下文);
getHolder().addCallback(此);
_thread=newdrawingthread(getHolder(),this);
}
公共布尔onTouchEvent(运动事件){
已同步(\u thread.getSurfaceHolder()){
if(event.getAction()==MotionEvent.ACTION\u向下){
路径=新路径();
x1=event.getX();
y1=event.getY();
moveTo(event.getX(),event.getY());
lineTo(event.getX(),event.getY());
}else if(event.getAction()==MotionEvent.ACTION\u MOVE){
lineTo(event.getX(),event.getY());
}else if(event.getAction()==MotionEvent.ACTION\u UP){
x2=event.getX();
y2=event.getY();
lineTo(event.getX(),event.getY());
_添加(路径);
isDraw=真;
}
返回true;
}
}
@凌驾
公共空白onDraw(画布){
用于(路径:_图形){
//画布绘制点(graphic.x、graphic.y、mPaint);
canvas.drawPath(路径,mPaint);
如果(isDraw){
帆布.抽绳(x1,y1,x2,y2,mPaint);
isDraw=假;
}
}
}
公共无效表面更改(表面文件夹持有者,整型格式,整型宽度,
整数高度){
//TODO自动生成的方法存根
}
已创建的公共空白表面(表面持有人){
//TODO自动生成的方法存根
_thread.setRunning(true);
_thread.start();
}
公共空间表面覆盖(表面覆盖物持有人){
//TODO自动生成的方法存根
布尔重试=真;
_thread.setRunning(false);
while(重试){
试一试{
_thread.join();
重试=错误;
}捕捉(中断异常e){
//我们会一次又一次的尝试。。。
}
}
}
}
类DrawingThread扩展线程{
私人表面股东(SurfaceHolder);;
专用绘图面板(U面板),;
私有布尔值_run=false;
公共绘图线程(SurfaceHolder SurfaceHolder、DrawingPanel面板){
_surfaceHolder=surfaceHolder;
_面板=面板;
}
公共void setRunning(布尔运行){
_跑=跑;
}
publicssurfaceholder getSurfaceHolder(){
返回(surfaceHolder);;
}
@凌驾
公开募捐{
帆布c;
while(_run){
c=零;
试一试{
c=_surfaceHolder.lockCanvas(null);
已同步(_surfaceHolder){
_专家组:onDraw(c);
}
}最后{
//在finally中执行此操作,以便在引发异常时
//在上述过程中,我们不会将曲面保留在
//不一致状态
如果(c!=null){
_打开CanvasandPost(c)的锁;
}
}
}
}
}
}
我不知道这在地图上是否有效。但这在正常情况下是可行的。就这样试试。我得到了这个编码的以下输出。我希望这对你有帮助
像这样解决
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
path = new Path();
float upX;
float upY;
Log.d("", "OnTouch");
switch (action) {
case MotionEvent.ACTION_DOWN:
downx = event.getX();
downy = event.getY();
eventX = downx;
eventY = downy;
Log.d("", "startx" + eventX);
break;
case MotionEvent.ACTION_MOVE:
upx = event.getX();
upy = event.getY();
canvas.drawLine(downx, downy, upx, upy, paint);
drawable.invalidate();
downx = upx;
downy = upy;
break;
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
Log.d("", "Action Up");
Log.d("", "endx" + upX);
//path.moveTo(eventX, eventY);
canvas.drawLine(eventX, eventY, upX, upY, paint);
drawable.invalidate();
return true;
case MotionEvent.ACTION_CANCEL:
break;
default:
break;
}
return true;
}
记住第一个接触点,并手动将其拉回到动作事件中的坐标。谢谢回答。May你的代码正在运行,但我无法跟踪你的代码。我没有时间。我解决了我的问题。无论如何,这对其他人都有帮助+我对你的答案有信心。