Java Code Examples for android.graphics.Canvas

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    int measuredHeight = getMeasuredHeight();

    float x = (getRight() - getLeft()) / 2;
    float y = (getBottom() - getTop()) / 2 + textHeight / 2;

    int currentValueStart = (int) (y + currentScrollOffset);
    int prevValueStart = currentValueStart - measuredHeight;
    int nextValueStart = currentValueStart + measuredHeight;

    canvas.drawText(getValue(currentValueOffset + 1) + "", x, prevValueStart, textPaint);
    canvas.drawText(getValue(currentValueOffset) + "", x, currentValueStart, textPaint);
    canvas.drawText(getValue(currentValueOffset - 1) + "", x, nextValueStart, textPaint);
}
 

public final synchronized boolean draw(Canvas canvas, float left, float top, Paint paint) {
    boolean z = true;
    synchronized (this) {
        if (this.bitmapArray != null) {
            for (int i = 0; i < this.bitmapArray.length; i++) {
                for (int j = 0; j < this.bitmapArray[i].length; j++) {
                    Bitmap bmp = this.bitmapArray[i][j];
                    if (bmp != null) {
                        float dleft = left + ((float) (bmp.getWidth() * j));
                        if (dleft <= ((float) canvas.getWidth()) && ((float) bmp.getWidth()) + dleft >= 0.0f) {
                            float dtop = top + ((float) (bmp.getHeight() * i));
                            if (dtop <= ((float) canvas.getHeight()) && ((float) bmp.getHeight()) + dtop >= 0.0f) {
                                canvas.drawBitmap(bmp, dleft, dtop, paint);
                            }
                        }
                    }
                }
            }
        } else if (this.bitmap != null) {
            canvas.drawBitmap(this.bitmap, left, top, paint);
        } else {
            z = false;
        }
    }
    return z;
}
 

/** Draw dividers to the right of each child view */
public void drawHorizontal(Canvas c, RecyclerView parent) {
    final int top = parent.getPaddingTop();
    final int bottom = parent.getHeight() - parent.getPaddingBottom();

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params =
                (RecyclerView.LayoutParams) child.getLayoutParams();
        final int left = child.getRight() + params.rightMargin + mInsets;
        final int right = left + mDivider.getIntrinsicWidth();
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}
 

/**
 * 绘制间隔
 */
private void drawVertical(Canvas c, RecyclerView parent) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();
    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                .getLayoutParams();
        final int top = child.getBottom() + params.bottomMargin +
                Math.round(ViewCompat.getTranslationY(child));
        final int bottom = top + mDivider.getIntrinsicHeight();
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}
 

@Override
public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
  Bitmap source = resource.get();

  int width = source.getWidth();
  int height = source.getHeight();

  Bitmap.Config config =
      source.getConfig() != null ? source.getConfig() : Bitmap.Config.ARGB_8888;
  Bitmap bitmap = mBitmapPool.get(width, height, config);
  if (bitmap == null) {
    bitmap = Bitmap.createBitmap(width, height, config);
  }

  Canvas canvas = new Canvas(bitmap);
  Paint paint = new Paint();
  paint.setAntiAlias(true);
  paint.setColorFilter(new PorterDuffColorFilter(mColor, PorterDuff.Mode.SRC_ATOP));
  canvas.drawBitmap(source, 0, 0, paint);

  return BitmapResource.obtain(bitmap, mBitmapPool);
}
 

public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    Log.i("zdy", "......" + getWidth() + " " + getHeight());
    if (getWidth() != 0) {
        int count = this.textArr.length;
        Paint p = new Paint();
        p.setColor(this.lineColor);
        p.setStyle(Style.FILL);
        float with = (((float) getWidth()) * 1.0f) / ((float) this.textArr.length);
        for (int i = 1; i < count; i++) {
            RectF r1 = new RectF();
            float nPos = with * ((float) i);
            r1.left = nPos - (((float) this.space) / 2.0f);
            r1.right = (((float) this.space) / 2.0f) + nPos;
            r1.top = (float) (this.lineStroke + 0);
            r1.bottom = (float) (getHeight() - this.lineStroke);
            canvas.drawRect(r1, p);
        }
    }
}
 

/**
 * 画折线
 *
 * @param canvas
 */
public void drawLines(Canvas canvas, Line line) {
    if (line != null && isShow) {
        linePaint.setColor(line.getLineColor());
        linePaint.setStrokeWidth(LeafUtil.dp2px(mContext, line.getLineWidth()));
        linePaint.setStyle(Paint.Style.STROKE);
        List<PointValue> values = line.getValues();
        Path path = line.getPath();
        int size = values.size();
        for (int i = 0; i < size; i++) {
            PointValue point = values.get(i);
            if (i == 0) path.moveTo(point.getOriginX(), point.getOriginY());
            else path.lineTo(point.getOriginX(), point.getOriginY());
        }

        measure = new PathMeasure(path, false);
        linePaint.setPathEffect(createPathEffect(measure.getLength(), phase, 0.0f));
        canvas.drawPath(path, linePaint);

    }
}
 

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (mBitmap == null) {
        mPaint.setStyle(Paint.Style.STROKE);
        canvas.drawCircle(mWidth / 2, mWidth / 2, mCircleRadius, mPaint);
    } else {
        if (isChecked()) {
            mPaint.setColor(mColorChecked);
            if (mBackgroundChecked != null)
                mBitmap = Bitmap.createScaledBitmap(mBackgroundChecked, mCircleRadius, mCircleRadius, true);
        } else {
            mPaint.setColor(mColorNormal);
            if (mBackground != null)
                mBitmap = Bitmap.createScaledBitmap(mBackground, mCircleRadius, mCircleRadius, true);
        }
        mPaint.setStyle(Paint.Style.FILL);
        canvas.drawCircle(mWidth / 2, mWidth / 2, mCircleRadius, mPaint);
        canvas.drawBitmap(mBitmap, mCircleRadius + mMargin - mBitmap.getWidth() / 2, mCircleRadius + mMargin - mBitmap.getHeight() / 2, mPaint);
    }

}
 

@Override
public void draw(Canvas c, MapView mapView, boolean shadow) {
	if (mFocusChanged) {
		mFocusChanged = false;

		// Remove any current focus
		if (mPopupView != null)
			mapView.removeView(mPopupView);

		SampleOverlayItem item = this.getFocus();
		if (item != null) {
			mPopupView = getPopupView(mapView.getContext(), item);
			MapView.LayoutParams lp = new MapView.LayoutParams(LayoutParams.WRAP_CONTENT,
					LayoutParams.WRAP_CONTENT, item.getPoint(),
					MapView.LayoutParams.TOP_CENTER, 0, 0);
			mapView.addView(mPopupView, lp);
		}
	}
	super.draw(c, mapView, shadow);
}
 

@Override
protected void onDraw(Canvas canvas) {
    if (mIfDrawText) {
        calculateDrawRectF();
    } else {
        calculateDrawRectFWithoutProgressText();
    }

    if (mDrawReachedBar) {
        canvas.drawRect(mReachedRectF, mReachedBarPaint);
    }

    if (mDrawUnreachedBar) {
        canvas.drawRect(mUnreachedRectF, mUnreachedBarPaint);
    }

    if (mIfDrawText) canvas.drawText(mCurrentDrawText, mDrawTextStart, mDrawTextEnd, mTextPaint);
}
 

public static Bitmap getRoundedCornerBitmap(Bitmap input,
        float cornerRadius, int w, int h) {

    Bitmap output = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, w, h);
    final RectF rectF = new RectF(rect);

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, cornerRadius, cornerRadius, paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(input, 0, 0, paint);

    return output;
}
 

@Override
protected void onDraw(Canvas canvas) {
    if (currentAction == ACTION_DELETE || currentAction == ACTION_CLEAR) {
        int newSeconds = timeLeft > 0 ? (int) Math.ceil(timeLeft / 1000.0f) : 0;
        if (prevSeconds != newSeconds) {
            prevSeconds = newSeconds;
            timeLeftString = String.format("%d", Math.max(1, newSeconds));
            textWidth = (int) Math.ceil(textPaint.measureText(timeLeftString));
        }
        canvas.drawText(timeLeftString, rect.centerX() - textWidth / 2, AndroidUtilities.dp(28.2f), textPaint);
        canvas.drawArc(rect, -90, -360 * (timeLeft / 5000.0f), false, progressPaint);
    }

    long newTime = SystemClock.elapsedRealtime();
    long dt = newTime - lastUpdateTime;
    timeLeft -= dt;
    lastUpdateTime = newTime;
    if (timeLeft <= 0) {
        hide(true, 1);
    }

    invalidate();
}
 

@Override
protected void onDraw(Canvas canvas)
{
    canvas.save();
    //旋转
    canvas.rotate(mRotateAngle, getViewCenterX(), getViewCenterY());
    //路径
    createStarPath(mStarPath, 5, -18);
    //路径加入中心圆
    mStarPath.addCircle(getViewCenterX(), getViewCenterY(), mCenterCircleR, Path.Direction.CW);
    //这个很关键，选择路径填充方式
    mStarPath.setFillType(Path.FillType.EVEN_ODD);
    //绘制
    canvas.drawPath(mStarPath, mFullPaint);
    canvas.restore();
}
 

/**
 * Drawing only virtical lines in Android
 */
private void drawVertical(Canvas c, RecyclerView parent) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = parent.getChildAt(i);
        final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                .getLayoutParams();
        final int top = child.getBottom() + params.bottomMargin;
        final int bottom = top + mDivider.getIntrinsicHeight();
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(c);
    }
}
 

@Override
public void draw(Canvas canvas) {

    canvas.drawCircle(mBounds.centerX(), mBounds.centerY(), mBounds.centerX(), mBackgroundPaint);
    Picture picture = new Picture() ;
    picture.draw(canvas);
    canvas.save();
    canvas.rotate(180 * mRotation, (x(0) + x(1))/2, (y(0) + y(1))/2);
    canvas.drawLine(x(0), y(0), x(1), y(1), mLinePaint);
    canvas.restore();

    canvas.save();
    canvas.rotate(180 * mRotation, (x(2) + x(3)) / 2, (y(2) + y(3)) / 2);
    canvas.drawLine(x(2), y(2), x(3), y(3), mLinePaint);
    canvas.restore();

    canvas.save();
    canvas.rotate(180 * mRotation, (x(4) + x(5)) / 2, (y(4) + y(5)) / 2);
    canvas.drawLine(x(4), y(4), x(5), y(5), mLinePaint);
    canvas.restore();

}
 

@Override
public Bitmap transform(Bitmap source) {
    int size = Math.min(source.getWidth(), source.getHeight());

    int x = (source.getWidth() - size) / 2;
    int y = (source.getHeight() - size) / 2;

    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
    if (squaredBitmap != source) {
        source.recycle();
    }

    Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setAntiAlias(true);

    float r = size / 2f;
    canvas.drawCircle(r, r, r, paint);

    squaredBitmap.recycle();
    return bitmap;
}
 

@Override
protected void onDraw(Canvas canvas){
	TextPaint textPaint = getPaint(); 
	textPaint.setColor(getCurrentTextColor());
	textPaint.drawableState = getDrawableState();

	canvas.save();
	
	if(topDown){
		canvas.translate(getWidth(), 0);
		canvas.rotate(90);
	}else {
		canvas.translate(0, getHeight());
		canvas.rotate(-90);
	}

	canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
	getLayout().draw(canvas);
	canvas.restore();
}
 

@Override
protected void onDraw(Canvas canvas) {
    if (mBitmap == null) {
        return;
    }

    if (mFillColor != Color.TRANSPARENT) {
        canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mFillPaint);
    }

    canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mBitmapPaint);

    if (mBorderWidth != 0) {
        canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mBorderRadius, mBorderPaint);
    }
}
 

/**
 * This method draws dimmed area around the crop bounds.
 *
 * @param canvas - valid canvas object
 */
protected void drawDimmedLayer(@NonNull Canvas canvas) {
    canvas.save();
    if (mCircleDimmedLayer) {
        canvas.clipPath(mCircularPath, Region.Op.DIFFERENCE);
    } else {
        canvas.clipRect(mCropViewRect, Region.Op.DIFFERENCE);
    }
    canvas.drawColor(mDimmedColor);
    canvas.restore();

    if (mCircleDimmedLayer) { // Draw 1px stroke to fix antialias
        canvas.drawCircle(mCropViewRect.centerX(), mCropViewRect.centerY(),
                Math.min(mCropViewRect.width(), mCropViewRect.height()) / 2.f, mDimmedStrokePaint);
    }
}
 

public void draw(Canvas c) {
    Drawable shadowDrawable;
    super.draw(c);
    if (isLayoutRtlSupport()) {
        shadowDrawable = this.mShadowDrawableRight;
    } else {
        shadowDrawable = this.mShadowDrawableLeft;
    }
    View shadowView = getChildCount() > 1 ? getChildAt(1) : null;
    if (shadowView != null && shadowDrawable != null) {
        int left;
        int right;
        int top = shadowView.getTop();
        int bottom = shadowView.getBottom();
        int shadowWidth = shadowDrawable.getIntrinsicWidth();
        if (isLayoutRtlSupport()) {
            left = shadowView.getRight();
            right = left + shadowWidth;
        } else {
            right = shadowView.getLeft();
            left = right - shadowWidth;
        }
        shadowDrawable.setBounds(left, top, right, bottom);
        shadowDrawable.draw(c);
    }
}
 

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
            .getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect); 
    final float roundPx = pixels;               //圆角

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));  //Mode.SRC_IN 用前面画的“圆角矩形”对bitmap进行裁剪。
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}
 

public void drawSelector(View content, Canvas canvas, float openPercent) {
	if (!mSelectorEnabled) return;
	if (mSelectorDrawable != null && mSelectedView != null) {
		String tag = (String) mSelectedView.getTag(R.id.selected_view);
		if (tag.equals(TAG+"SelectedView")) {
			canvas.save();
			int left, right, offset;
			offset = (int) (mSelectorDrawable.getWidth() * openPercent);
			if (mMode == SlidingMenu.LEFT) {
				right = content.getLeft();
				left = right - offset;
				canvas.clipRect(left, 0, right, getHeight());
				canvas.drawBitmap(mSelectorDrawable, left, getSelectorTop(), null);		
			} else if (mMode == SlidingMenu.RIGHT) {
				left = content.getRight();
				right = left + offset;
				canvas.clipRect(left, 0, right, getHeight());
				canvas.drawBitmap(mSelectorDrawable, right - mSelectorDrawable.getWidth(), getSelectorTop(), null);
			}
			canvas.restore();
		}
	}
}
 

/**
 * Draw the {@link Bitmap} of the drawable which indicated filled and empty
 * passcode digits
 *
 * @param canvas - {@link Canvas} on which the drawable should be drawn
 */
private void drawDigitDrawable(Canvas canvas) {
  paint.setAlpha(255);
  int x = drawableStartX, y = drawableStartY;
  int totalContentWidth = drawableWidth + digitHorizontalPadding;
  for (int i = 1; i <= filledCount; i++) {
    canvas.drawBitmap(filledDrawable, x, y, paint);
    x += totalContentWidth;
  }
  for (int i = 1; i <= (digits - filledCount); i++) {
    canvas.drawBitmap(emptyDrawable, x, y, paint);
    x += totalContentWidth;
  }
}
 

public CanvasTransformer zoom(final int openedX, final int closedX, 
		final int openedY, final int closedY,
		final int px, final int py, final Interpolator interp) {
	initTransformer();
	mTrans = new CanvasTransformer() {
		public void transformCanvas(Canvas canvas, float percentOpen) {
			mTrans.transformCanvas(canvas, percentOpen);
			float f = interp.getInterpolation(percentOpen);
			canvas.scale((openedX - closedX) * f + closedX,
					(openedY - closedY) * f + closedY, px, py);
		}			
	};
	return mTrans;
}
 

public void render(PointUtil p, int radius, Canvas canvas) {
    if (this.radius <= radius) {
        this.radius += growFactor; // / 10;
    } else {
        isFinished = true;
    }
    this.draw(p, canvas);
}
 

@NonNull
public static Bitmap getCircularBitmap(@NonNull Bitmap bitmap) {
    Preconditions.nonNull(bitmap);

    final Bitmap croppedCircularImg = Bitmap.createBitmap(
        bitmap.getWidth(),
        bitmap.getHeight(),
        Bitmap.Config.ARGB_8888
    );

    final Canvas canvas = new Canvas(croppedCircularImg);
    final Paint paint = new Paint();
    final Rect rectangle = new Rect(
        0,
        0,
        bitmap.getWidth(),
        bitmap.getHeight()
    );

    paint.setAntiAlias(true);
    paint.setDither(true);
    paint.setFilterBitmap(true);

    canvas.drawARGB(0, 0, 0, 0);

    paint.setColor(0xff424242);

    canvas.drawOval(new RectF(rectangle), paint);

    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

    canvas.drawBitmap(bitmap, rectangle, rectangle, paint);

    return croppedCircularImg;
}
 

@Override
protected void onDraw(Canvas canvas) {
    final int height = getHeight();
    final int childCount = getChildCount();
    final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
            ? mCustomTabColorizer
            : mDefaultTabColorizer;

    // Thick colored underline below the current selection
    if (childCount > 0) {
        View selectedTitle = getChildAt(mSelectedPosition);
        int left = selectedTitle.getLeft();
        int right = selectedTitle.getRight();
        int color = tabColorizer.getIndicatorColor(mSelectedPosition);

        if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
            int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
            if (color != nextColor) {
                color = blendColors(nextColor, color, mSelectionOffset);
            }

            // Draw the selection partway between the tabs
            View nextTitle = getChildAt(mSelectedPosition + 1);
            left = (int) (mSelectionOffset * nextTitle.getLeft() +
                    (1.0f - mSelectionOffset) * left);
            right = (int) (mSelectionOffset * nextTitle.getRight() +
                    (1.0f - mSelectionOffset) * right);
        }

        mSelectedIndicatorPaint.setColor(color);

        canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
                height, mSelectedIndicatorPaint);
    }

    // Thin underline along the entire bottom edge
    canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
}
 

public Bitmap getBitmapByView(View v)
{
    Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(),
            Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    v.draw(canvas);
    return bitmap;
}
 

@Override
public synchronized void draw(final Canvas canvas) {
    super.draw(canvas);
    if(callback != null) {
        callback.drawCallback(canvas);
    }
}
 

@Override
public void draw(Canvas canvas) {
    Drawable drawable = getDrawable();
    if (drawable != null) {
        drawable.draw(canvas);
    }
}