私が作成した描画クラスには、パフォーマンスの問題があります。描画アクションと元に戻す/やり直し機能を処理する方法に関係していると思います。パフォーマンスを向上させる方法について誰かアドバイスをいただけますか?
public class KNDrawingSurfaceView extends View {
private static final float MINP = 0.25f;
private static final float MAXP = 0.75f;
public Bitmap mBitmap;
public Canvas mCanvas;
public Path mPath;
public Paint mBitmapPaint;
float myWidth;
float myHeight;
public Paint mPaint;
public MaskFilter mEmboss;
public MaskFilter mBlur;
public ArrayList<Path> paths = new ArrayList<Path>();
public ArrayList<Paint>paints = new ArrayList<Paint>();
public ArrayList<Path> undonePaths = new ArrayList<Path>();
public ArrayList<Paint>undonePaints = new ArrayList<Paint>();
private KNSketchBookActivity _parent;
public KNDrawingSurfaceView(Context c, float width,float height, KNSketchBookActivity parent) {
super(c);
myWidth = width;
myHeight = height;
_parent =parent;
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f);
mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
mBitmap = Bitmap.createBitmap((int)myWidth, (int)myHeight, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
Log.v("onDraw:", "curent paths size:"+paths.size());
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
Paint tile = new Paint();
Bitmap tileImage = BitmapFactory.decodeResource(getResources(),R.drawable.checkerpattern);
BitmapShader shader = new BitmapShader(tileImage, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
tile.setShader(shader);
canvas.drawRect(0, 0, myWidth, myHeight, tile);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
for (Path p : paths){
canvas.drawPath(p, mPaint);
}
canvas.drawPath(mPath,mPaint);
}
public void onClickUndo () {
if (paths.size()>0)
{
undonePaths.add(paths.remove(paths.size()-1));
undonePaints.add(paints.remove(paints.size()-1));
invalidate();
}
else
{
}
_parent.checkButtonStates();
}
public void onClickRedo (){
if (undonePaths.size()>0)
{
paths.add(undonePaths.remove(undonePaths.size()-1));
paints.add(undonePaints.remove(undonePaints.size()-1));
invalidate();
}
else
{
}
_parent.checkButtonStates();
}
public void onClickClear (){
paths.clear();
undonePaths.clear();
invalidate();
_parent.checkButtonStates();
}
public void saveDrawing(){
FileOutputStream outStream = null;
String fileName = "tempTag";
try {
outStream = new FileOutputStream("/sdcard/" + fileName + ".png");
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
undonePaths.clear();
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}
}
private void touch_up() {
mPath.lineTo(mX, mY);
mCanvas.drawPath(mPath, mPaint);
paths.add(mPath);
paints.add(mPaint);
_parent.checkButtonStates();
mPath = new Path();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
if(x>myWidth){
x=myWidth;
}
if(y>myHeight){
y=myHeight;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
}
}
描画/キャンバスの最適化に関する経験やリンクがあれば教えてください