/** * Calculate Matrix for FIT_CENTER * * @param d - Drawable being displayed */ private void updateBaseMatrix(Drawable d) { ImageView imageView = getImageView(); if (null == imageView || null == d) { return; } final float viewWidth = getImageViewWidth(imageView); final float viewHeight = getImageViewHeight(imageView); final int drawableWidth = d.getIntrinsicWidth(); final int drawableHeight = d.getIntrinsicHeight(); mBaseMatrix.reset(); final float widthScale = viewWidth / drawableWidth; final float heightScale = viewHeight / drawableHeight; if (mScaleType == ScaleType.CENTER) { mBaseMatrix.postTranslate( (viewWidth - drawableWidth) / 2F, (viewHeight - drawableHeight) / 2F); } else if (mScaleType == ScaleType.CENTER_CROP) { float scale = Math.max(widthScale, heightScale); mBaseMatrix.postScale(scale, scale); mBaseMatrix.postTranslate( (viewWidth - drawableWidth * scale) / 2F, (viewHeight - drawableHeight * scale) / 2F); } else if (mScaleType == ScaleType.CENTER_INSIDE) { float scale = Math.min(1.0f, Math.min(widthScale, heightScale)); mBaseMatrix.postScale(scale, scale); mBaseMatrix.postTranslate( (viewWidth - drawableWidth * scale) / 2F, (viewHeight - drawableHeight * scale) / 2F); } else { RectF mTempSrc = new RectF(0, 0, drawableWidth, drawableHeight); RectF mTempDst = new RectF(0, 0, viewWidth, viewHeight); switch (mScaleType) { case FIT_CENTER: mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.CENTER); break; case FIT_START: mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.START); break; case FIT_END: mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.END); break; case FIT_XY: mBaseMatrix.setRectToRect(mTempSrc, mTempDst, ScaleToFit.FILL); break; default: break; } } resetMatrix(); }
public void update() { ImageView imageView = getImageView(); if (null != imageView) { if (mZoomEnabled) { // Make sure we using MATRIX Scale Type setImageViewScaleTypeMatrix(imageView); // Update the base matrix using the current drawable updateBaseMatrix(imageView.getDrawable()); } else { // Reset the Matrix... resetMatrix(); } } }