/**
* 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();
}
}
}