3 개의 원이있는 창이 있는데, 동시에 회전합니다. 서클에 텍스트를 추가 할 때까지 모든 것이 유효합니다. 회전이 뒤떨어지기 시작합니다.캔버스에서 텍스트 그리기를 최적화하는 방법
어떻게 캔버스에 그리기 최적화 할 수 있습니다?
@Override
protected void onDraw(final Canvas canvas) {
if (mPaint == null) {
mPaint = new Paint();
mPaint.setTextSize(20f);
}
drawUpperCircle(canvas);
drawBottomCircle(canvas);
drawMainCircle(canvas);
try {
Thread.sleep(1, 1);
invalidate();
mRotation += 0.9;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
super.onDraw(canvas);
}
private void drawUpperCircle(Canvas canvas) {
canvas.save();
canvas.rotate(mRotation, 0, mUpperCircleCentr);
mPaint.setColor(Color.CYAN);
canvas.drawCircle(0, mUpperCircleCentr, mUpperCirclRadius, mPaint);
mPaint.setColor(Color.BLACK);
for (int i = 0; i < SEG_COUNT; i++) {
canvas.rotate(SEG_IN_GRAD, 0, mUpperCircleCentr);
canvas.drawLine(0, mUpperCircleCentr, mUpperCirclRadius, mUpperCircleCentr, mPaint);
// canvas.drawText("my text" + String.valueOf(i), mUpperCirclRadius * 2/3, mUpperCircleCentr - 4, mPaint);
}
canvas.restore();
}
private void drawBottomCircle(Canvas canvas) {
canvas.save();
canvas.rotate(mRotation, 0, mBottomCircleCentr);
mPaint.setColor(Color.RED);
canvas.drawCircle(0, mBottomCircleCentr, mBottomCirclRadius, mPaint);
mPaint.setColor(Color.BLACK);
for (int i = 0; i < SEG_COUNT; i++) {
canvas.rotate(SEG_IN_GRAD, 0, mBottomCircleCentr);
canvas.drawLine(0, mBottomCircleCentr, mBottomCirclRadius, mBottomCircleCentr, mPaint);
// canvas.drawText("my text" + String.valueOf(i), mBottomCirclRadius * 2/3, mBottomCircleCentr - 4, mPaint);
}
canvas.restore();
}
private void drawMainCircle(Canvas canvas) {
canvas.save();
canvas.rotate(mRotation, 0, mMainCircleCentr);
mPaint.setColor(Color.argb(100, 100, 100, 100));
canvas.drawCircle(0, mMainCircleCentr, mMainCirclRadius, mPaint);
mPaint.setColor(Color.BLACK);
for (int i = 0; i < SEG_COUNT; i++) {
canvas.rotate(SEG_IN_GRAD, 0, mMainCircleCentr);
canvas.drawLine(0, mMainCircleCentr, mMainCirclRadius, mMainCircleCentr, mPaint);
canvas.drawText("my text" + String.valueOf(i), mMainCirclRadius * 2/3, mMainCircleCentr - 4, mPaint);
}
canvas.restore();
}
편집 성능을 개선하고 내가 SurfaceView
으로 더블 버퍼링을 사용했다 UI 스레드에서 그리기 제거하고 @Morgans 최적화를 구현하려면 : 이 내 코드입니다. 그것이 실현 된 방법입니다.
DrawView.java
public class DrawView extends SurfaceView implements SurfaceHolder.Callback {
...............................................................
public DrawView(Context context, AttributeSet attrs) {
super(context, attrs);
getHolder().addCallback(this);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float currentX = event.getX();
float currentY = event.getY();
float deltaX, deltaY;
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
// Modify rotational angles according to movement
deltaX = currentX - previousX;
deltaY = currentY - previousY;
mDrawThread.mRotation += deltaY * 180/getHeight();
}
// Save current x, y
previousX = currentX;
previousY = currentY;
return true; // Event handled
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
mDrawThread = new DrawThread(getHolder(), this);
mDrawThread.setRunning(true);
mDrawThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
boolean retry = true;
mDrawThread.setRunning(false);
while (retry) {
try {
mDrawThread.join();
retry = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
그리고 주요 작품은 DrawThread.java에서 이루어집니다
public class DrawThread extends Thread {
private ArrayList<Path> mMainCirclePaths = new ArrayList<Path>(SEG_COUNT);
private ArrayList<Path> mUpperCirclePaths = new ArrayList<Path>(SEG_COUNT);
private ArrayList<Path> mCenterCirclePaths = new ArrayList<Path>(SEG_COUNT);
private ArrayList<Path> mBottomCirclePaths = new ArrayList<Path>(SEG_COUNT);
private boolean mRun = false;
private SurfaceHolder mSurfaceHolder;
private DrawView mDrawView;
private Paint mPaint;
private CirclesModel mCirclesModel;
public float mRotation = 0;
public DrawThread(SurfaceHolder surfaceHolder, DrawView drawView) {
mSurfaceHolder = surfaceHolder;
mDrawView = drawView;
mCirclesModel = new CirclesModel(mDrawView.getHeight());
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setTextSize(18f);
initPaths();
}
public void setRunning(boolean b) {
mRun = b;
}
@Override
public void run() {
while (mRun) {
Canvas canvas = null;
try {
canvas = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder) {
drawMainCircle(canvas);
mPaint.setColor(Color.WHITE);
canvas.drawCircle(mCirclesModel.mMainCircleCentr[CirclesModel.X], mCirclesModel.mMainCircleCentr[CirclesModel.Y],
mCirclesModel.mSmallCirclesRadius, mPaint);
drawCenterCircle(canvas);
drawUpperCircle(canvas);
drawBottomCircle(canvas);
//mRotation += 0.5f;
}
} finally {
if (canvas != null) {
mSurfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
}
private void drawMainCircle(Canvas canvas) {
canvas.save();
canvas.rotate(mRotation, mCirclesModel.mMainCircleCentr[CirclesModel.X], mCirclesModel.mMainCircleCentr[CirclesModel.Y]);
float rot = mRotation;
mPaint.setColor(Color.LTGRAY/* argb(100, 255, 255, 255) */);
canvas.drawCircle(mCirclesModel.mMainCircleCentr[CirclesModel.X], mCirclesModel.mMainCircleCentr[CirclesModel.Y],
mCirclesModel.mBigCirclesRadius, mPaint);
mPaint.setColor(Color.BLACK);
for (int i = 0; i < SEG_COUNT; i++) {
canvas.rotate(SEG_IN_GRAD, mCirclesModel.mMainCircleCentr[CirclesModel.X], mCirclesModel.mMainCircleCentr[CirclesModel.Y]);
rot += SEG_IN_GRAD;
float absRot = Math.abs(rot % 360);
if (absRot > mCirclesModel.mMainCircleSegment[0] && absRot < mCirclesModel.mMainCircleSegment[1]) {
continue;
}
canvas.drawLine(mCirclesModel.mMainCircleCentr[CirclesModel.X], mCirclesModel.mMainCircleCentr[CirclesModel.Y],
mCirclesModel.mBigCirclesRadius, mCirclesModel.mMainCircleCentr[CirclesModel.Y], mPaint);
canvas.drawPath(mMainCirclePaths.get(i), mPaint);
// canvas.drawText("my text" + String.valueOf(i),
// mMainCirclRadius * 2/3, mMainCircleCentr - 4, mPaint);
}
canvas.restore();
}
.................................................................
}
더블 버퍼링은 두 줄의 코드로 구현
canvas = mSurfaceHolder.lockCanvas(null);
여기 나는 표면을 볼 수있는 캔버스에서 가져온다. xt 프레임.
mSurfaceHolder.unlockCanvasAndPost(canvas);
여기 저는 새로운 캔버스로 SurfaceView의 현재 이미지를 겹치기 때문에 이미지가 바뀌는 순간입니다. 투명 요소가있는 경우 이전 이미지가 계속 표시되고 이미지가 대체되지는 않지만 겹쳐 지는지 확인하십시오.
http://codereview.stackexchange.com/을 살펴 보셨습니까? 이 질문이 더 적절하게 거기에 가는지 궁금 하네 ... –
@DumbProducts codereview.stackexchange.com과 stackoverflow 사이에 다른 점은 무엇입니까? – Lemberg
codereview.stackexchange.com은 코드 최적화와 마찬가지로 stackoverflow가 오류 코드를 수정하는 방법이며,이 요법을 수행하는 방법입니다. –