@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// Draw translucent background for the cropped area.
switch (cropType) {
case RECT:
drawBackground(canvas, mBitmapRect);
break;
case OVAL:
drawOvalBackground(canvas, mBitmapRect);
break;
default:
break;
}
if (showGuidelines()) {
// Determines whether guidelines should be drawn or not
if (mGuidelines == GUIDELINES_ON) {
drawRuleOfThirdsGuidelines(canvas);
} else if (mGuidelines == GUIDELINES_ON_TOUCH) {
// Draw only when resizing
if (mPressedHandle != null) drawRuleOfThirdsGuidelines(canvas);
} else if (mGuidelines == GUIDELINES_OFF) {
// Do nothing
}
}
switch (cropType) {
case RECT:
// Draws the main crop window border.
canvas.drawRect(
Edge.LEFT.getCoordinate(),
Edge.TOP.getCoordinate(),
Edge.RIGHT.getCoordinate(),
Edge.BOTTOM.getCoordinate(),
mBorderPaint);
break;
case OVAL:
oval.set(
Edge.LEFT.getCoordinate(),
Edge.TOP.getCoordinate(),
Edge.RIGHT.getCoordinate(),
Edge.BOTTOM.getCoordinate());
canvas.drawOval(oval, mBorderPaint);
break;
default:
break;
}
drawCorners(canvas);
}
private void drawBackground(Canvas canvas, Rect bitmapRect) {
final float left = Edge.LEFT.getCoordinate();
final float top = Edge.TOP.getCoordinate();
final float right = Edge.RIGHT.getCoordinate();
final float bottom = Edge.BOTTOM.getCoordinate();
/*-
-------------------------------------
| top |
-------------------------------------
| | | |
| | | |
| left | | right |
| | | |
| | | |
-------------------------------------
| bottom |
-------------------------------------
*/
// Draw "top", "bottom", "left", then "right" quadrants.
canvas.drawRect(bitmapRect.left, bitmapRect.top, bitmapRect.right, top, mBackgroundPaint);
canvas.drawRect(bitmapRect.left, bottom, bitmapRect.right, bitmapRect.bottom, mBackgroundPaint);
canvas.drawRect(bitmapRect.left, top, left, bottom, mBackgroundPaint);
canvas.drawRect(right, top, bitmapRect.right, bottom, mBackgroundPaint);
}
/**
* Indicates whether the crop window is small enough that the guidelines should be shown. Public
* because this function is also used to determine if the center handle should be focused.
*
* @return boolean Whether the guidelines should be shown or not
*/
public static boolean showGuidelines() {
if ((Math.abs(Edge.LEFT.getCoordinate() - Edge.RIGHT.getCoordinate())
< DEFAULT_SHOW_GUIDELINES_LIMIT)
|| (Math.abs(Edge.TOP.getCoordinate() - Edge.BOTTOM.getCoordinate())
< DEFAULT_SHOW_GUIDELINES_LIMIT)) return false;
else return true;
}
private void drawOvalBackground(Canvas canvas, Rect bitmapRect) {
final float left = Edge.LEFT.getCoordinate();
final float top = Edge.TOP.getCoordinate();
final float right = Edge.RIGHT.getCoordinate();
final float bottom = Edge.BOTTOM.getCoordinate();
RectF r = new RectF(left, top, right, bottom);
Path path = new Path();
path.addRect(
bitmapRect.left, bitmapRect.top, bitmapRect.right, bitmapRect.bottom, Path.Direction.CW);
path.addOval(r, Path.Direction.CCW);
path.setFillType(Path.FillType.EVEN_ODD);
canvas.drawPath(path, mBackgroundPaint);
}
private void drawCorners(Canvas canvas) {
final float left = Edge.LEFT.getCoordinate();
final float top = Edge.TOP.getCoordinate();
final float right = Edge.RIGHT.getCoordinate();
final float bottom = Edge.BOTTOM.getCoordinate();
// Draws the corner lines
// Top left
canvas.drawLine(
left - mCornerOffset,
top - mCornerExtension,
left - mCornerOffset,
top + mCornerLength,
mCornerPaint);
canvas.drawLine(
left, top - mCornerOffset, left + mCornerLength, top - mCornerOffset, mCornerPaint);
// Top right
canvas.drawLine(
right + mCornerOffset,
top - mCornerExtension,
right + mCornerOffset,
top + mCornerLength,
mCornerPaint);
canvas.drawLine(
right, top - mCornerOffset, right - mCornerLength, top - mCornerOffset, mCornerPaint);
// Bottom left
canvas.drawLine(
left - mCornerOffset,
bottom + mCornerExtension,
left - mCornerOffset,
bottom - mCornerLength,
mCornerPaint);
canvas.drawLine(
left, bottom + mCornerOffset, left + mCornerLength, bottom + mCornerOffset, mCornerPaint);
// Bottom left
canvas.drawLine(
right + mCornerOffset,
bottom + mCornerExtension,
right + mCornerOffset,
bottom - mCornerLength,
mCornerPaint);
canvas.drawLine(
right, bottom + mCornerOffset, right - mCornerLength, bottom + mCornerOffset, mCornerPaint);
}
/**
* Handles a {@link MotionEvent#ACTION_DOWN} event.
*
* @param x the x-coordinate of the down action
* @param y the y-coordinate of the down action
*/
private void onActionDown(float x, float y) {
final float left = Edge.LEFT.getCoordinate();
final float top = Edge.TOP.getCoordinate();
final float right = Edge.RIGHT.getCoordinate();
final float bottom = Edge.BOTTOM.getCoordinate();
mPressedHandle = HandleUtil.getPressedHandle(x, y, left, top, right, bottom, mHandleRadius);
if (mPressedHandle == null) return;
// Calculate the offset of the touch point from the precise location
// of the handle. Save these values in a member variable since we want
// to maintain this offset as we drag the handle.
mTouchOffset = HandleUtil.getOffset(mPressedHandle, x, y, left, top, right, bottom);
invalidate();
}
@Override
void updateCropWindow(float x, float y, @NonNull RectF imageRect, float snapRadius) {
float left = Edge.LEFT.getCoordinate();
float top = Edge.TOP.getCoordinate();
float right = Edge.RIGHT.getCoordinate();
float bottom = Edge.BOTTOM.getCoordinate();
final float currentCenterX = (left + right) / 2;
final float currentCenterY = (top + bottom) / 2;
final float offsetX = x - currentCenterX;
final float offsetY = y - currentCenterY;
// Adjust the crop window.
Edge.LEFT.offset(offsetX);
Edge.TOP.offset(offsetY);
Edge.RIGHT.offset(offsetX);
Edge.BOTTOM.offset(offsetY);
// Check if we have gone out of bounds on the sides, and fix.
if (Edge.LEFT.isOutsideMargin(imageRect, snapRadius)) {
final float offset = Edge.LEFT.snapToRect(imageRect);
Edge.RIGHT.offset(offset);
} else if (Edge.RIGHT.isOutsideMargin(imageRect, snapRadius)) {
final float offset = Edge.RIGHT.snapToRect(imageRect);
Edge.LEFT.offset(offset);
}
// Check if we have gone out of bounds on the top or bottom, and fix.
if (Edge.TOP.isOutsideMargin(imageRect, snapRadius)) {
final float offset = Edge.TOP.snapToRect(imageRect);
Edge.BOTTOM.offset(offset);
} else if (Edge.BOTTOM.isOutsideMargin(imageRect, snapRadius)) {
final float offset = Edge.BOTTOM.snapToRect(imageRect);
Edge.TOP.offset(offset);
}
}
/**
* Gets the cropped image based on the current crop window.
*
* @return a new Bitmap representing the cropped image
*/
public Bitmap getCroppedImage() {
final Rect displayedImageRect = ImageViewUtil.getBitmapRectCenterInside(mBitmap, mImageView);
// Get the scale factor between the actual Bitmap dimensions and the
// displayed dimensions for width.
final float actualImageWidth = mBitmap.getWidth();
final float displayedImageWidth = displayedImageRect.width();
final float scaleFactorWidth = actualImageWidth / displayedImageWidth;
// Get the scale factor between the actual Bitmap dimensions and the
// displayed dimensions for height.
final float actualImageHeight = mBitmap.getHeight();
final float displayedImageHeight = displayedImageRect.height();
final float scaleFactorHeight = actualImageHeight / displayedImageHeight;
// Get crop window position relative to the displayed image.
final float cropWindowX = Edge.LEFT.getCoordinate() - displayedImageRect.left;
final float cropWindowY = Edge.TOP.getCoordinate() - displayedImageRect.top;
final float cropWindowWidth = Edge.getWidth();
final float cropWindowHeight = Edge.getHeight();
// Scale the crop window position to the actual size of the Bitmap.
final float actualCropX = cropWindowX * scaleFactorWidth;
final float actualCropY = cropWindowY * scaleFactorHeight;
final float actualCropWidth = cropWindowWidth * scaleFactorWidth;
final float actualCropHeight = cropWindowHeight * scaleFactorHeight;
// Cropget the subset from the original Bitmap.
final Bitmap croppedBitmap =
Bitmap.createBitmap(
mBitmap,
(int) actualCropX,
(int) actualCropY,
(int) actualCropWidth,
(int) actualCropHeight);
return croppedBitmap;
}
private void drawRuleOfThirdsGuidelines(Canvas canvas) {
final float left = Edge.LEFT.getCoordinate();
final float top = Edge.TOP.getCoordinate();
final float right = Edge.RIGHT.getCoordinate();
final float bottom = Edge.BOTTOM.getCoordinate();
// Draw vertical guidelines.
final float oneThirdCropWidth = Edge.getWidth() / 3;
final float x1 = left + oneThirdCropWidth;
canvas.drawLine(x1, top, x1, bottom, mGuidelinePaint);
final float x2 = right - oneThirdCropWidth;
canvas.drawLine(x2, top, x2, bottom, mGuidelinePaint);
// Draw horizontal guidelines.
final float oneThirdCropHeight = Edge.getHeight() / 3;
final float y1 = top + oneThirdCropHeight;
canvas.drawLine(left, y1, right, y1, mGuidelinePaint);
final float y2 = bottom - oneThirdCropHeight;
canvas.drawLine(left, y2, right, y2, mGuidelinePaint);
}
/**
* Set the initial crop window size and position. This is dependent on the size and position of
* the image being cropped.
*
* @param bitmapRect the bounding box around the image being cropped
*/
private void initCropWindow(Rect bitmapRect) {
// Tells the attribute functions the crop window has already been
// initialized
if (initializedCropWindow == false) initializedCropWindow = true;
if (mFixAspectRatio) {
// If the image aspect ratio is wider than the crop aspect ratio,
// then the image height is the determining initial length. Else,
// vice-versa.
if (AspectRatioUtil.calculateAspectRatio(bitmapRect) > mTargetAspectRatio) {
Edge.TOP.setCoordinate(bitmapRect.top);
Edge.BOTTOM.setCoordinate(bitmapRect.bottom);
final float centerX = getWidth() / 2f;
// Limits the aspect ratio to no less than 40 wide or 40 tall
final float cropWidth =
Math.max(
Edge.MIN_CROP_LENGTH_PX,
AspectRatioUtil.calculateWidth(
Edge.TOP.getCoordinate(), Edge.BOTTOM.getCoordinate(), mTargetAspectRatio));
// Create new TargetAspectRatio if the original one does not fit
// the screen
if (cropWidth == Edge.MIN_CROP_LENGTH_PX)
mTargetAspectRatio =
(Edge.MIN_CROP_LENGTH_PX) / (Edge.BOTTOM.getCoordinate() - Edge.TOP.getCoordinate());
final float halfCropWidth = cropWidth / 2f;
Edge.LEFT.setCoordinate(centerX - halfCropWidth);
Edge.RIGHT.setCoordinate(centerX + halfCropWidth);
} else {
Edge.LEFT.setCoordinate(bitmapRect.left);
Edge.RIGHT.setCoordinate(bitmapRect.right);
final float centerY = getHeight() / 2f;
// Limits the aspect ratio to no less than 40 wide or 40 tall
final float cropHeight =
Math.max(
Edge.MIN_CROP_LENGTH_PX,
AspectRatioUtil.calculateHeight(
Edge.LEFT.getCoordinate(), Edge.RIGHT.getCoordinate(), mTargetAspectRatio));
// Create new TargetAspectRatio if the original one does not fit
// the screen
if (cropHeight == Edge.MIN_CROP_LENGTH_PX)
mTargetAspectRatio =
(Edge.RIGHT.getCoordinate() - Edge.LEFT.getCoordinate()) / Edge.MIN_CROP_LENGTH_PX;
final float halfCropHeight = cropHeight / 2f;
Edge.TOP.setCoordinate(centerY - halfCropHeight);
Edge.BOTTOM.setCoordinate(centerY + halfCropHeight);
}
} else { // ... do not fix aspect ratio...
// Initialize crop window to have 10% padding w/ respect to image.
final float horizontalPadding = 0.1f * bitmapRect.width();
final float verticalPadding = 0.1f * bitmapRect.height();
Edge.LEFT.setCoordinate(bitmapRect.left + horizontalPadding);
Edge.TOP.setCoordinate(bitmapRect.top + verticalPadding);
Edge.RIGHT.setCoordinate(bitmapRect.right - horizontalPadding);
Edge.BOTTOM.setCoordinate(bitmapRect.bottom - verticalPadding);
}
}