Back to project page image-crop.
The source code is released under:
Apache License
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package com.mobilesolutionworks.android.cropimage.camera; /*from w ww .j a va2s . c om*/ import android.content.Context; import android.graphics.Canvas; import android.graphics.Rect; import android.util.AttributeSet; import android.view.MotionEvent; import java.util.ArrayList; /** * Created by yunarta on 7/7/14. */ public class CropImageView extends ImageViewTouchBase { ArrayList<HighlightView> mHighlightViews = new ArrayList<HighlightView>(); HighlightView mMotionHighlightView = null; float mLastX, mLastY; int mMotionEdge; @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); if (mBitmapDisplayed.getBitmap() != null) { for (HighlightView hv : mHighlightViews) { hv.mMatrix.set(getImageMatrix()); hv.invalidate(); if (hv.mIsFocused) { centerBasedOnHighlightView(hv); } } } } public CropImageView(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void zoomTo(float scale, float centerX, float centerY) { super.zoomTo(scale, centerX, centerY); for (HighlightView hv : mHighlightViews) { hv.mMatrix.set(getImageMatrix()); hv.invalidate(); } } @Override protected void zoomIn() { super.zoomIn(); for (HighlightView hv : mHighlightViews) { hv.mMatrix.set(getImageMatrix()); hv.invalidate(); } } @Override protected void zoomOut() { super.zoomOut(); for (HighlightView hv : mHighlightViews) { hv.mMatrix.set(getImageMatrix()); hv.invalidate(); } } @Override protected void postTranslate(float deltaX, float deltaY) { super.postTranslate(deltaX, deltaY); for (int i = 0; i < mHighlightViews.size(); i++) { HighlightView hv = mHighlightViews.get(i); hv.mMatrix.postTranslate(deltaX, deltaY); hv.invalidate(); } } // According to the event's position, change the focus to the first // hitting cropping rectangle. private void recomputeFocus(MotionEvent event) { for (int i = 0; i < mHighlightViews.size(); i++) { HighlightView hv = mHighlightViews.get(i); hv.setFocus(false); hv.invalidate(); } for (int i = 0; i < mHighlightViews.size(); i++) { HighlightView hv = mHighlightViews.get(i); int edge = hv.getHit(event.getX(), event.getY()); if (edge != HighlightView.GROW_NONE) { if (!hv.hasFocus()) { hv.setFocus(true); hv.invalidate(); } break; } } invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { CropImage cropImage = (CropImage) this.getContext(); if (cropImage.mSaving) { return false; } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (cropImage.mWaitingToPick) { recomputeFocus(event); } else { for (int i = 0; i < mHighlightViews.size(); i++) { HighlightView hv = mHighlightViews.get(i); int edge = hv.getHit(event.getX(), event.getY()); if (edge != HighlightView.GROW_NONE) { mMotionEdge = edge; mMotionHighlightView = hv; mLastX = event.getX(); mLastY = event.getY(); mMotionHighlightView.setMode( (edge == HighlightView.MOVE) ? HighlightView.ModifyMode.Move : HighlightView.ModifyMode.Grow); break; } } } break; case MotionEvent.ACTION_UP: if (cropImage.mWaitingToPick) { for (int i = 0; i < mHighlightViews.size(); i++) { HighlightView hv = mHighlightViews.get(i); if (hv.hasFocus()) { cropImage.mCrop = hv; for (int j = 0; j < mHighlightViews.size(); j++) { if (j == i) { continue; } mHighlightViews.get(j).setHidden(true); } centerBasedOnHighlightView(hv); ((CropImage) this.getContext()).mWaitingToPick = false; return true; } } } else if (mMotionHighlightView != null) { centerBasedOnHighlightView(mMotionHighlightView); mMotionHighlightView.setMode( HighlightView.ModifyMode.None); } mMotionHighlightView = null; break; case MotionEvent.ACTION_MOVE: if (cropImage.mWaitingToPick) { recomputeFocus(event); } else if (mMotionHighlightView != null) { mMotionHighlightView.handleMotion(mMotionEdge, event.getX() - mLastX, event.getY() - mLastY); mLastX = event.getX(); mLastY = event.getY(); if (true) { // This section of code is optional. It has some user // benefit in that moving the crop rectangle against // the edge of the screen causes scrolling but it means // that the crop rectangle is no longer fixed under // the user's finger. ensureVisible(mMotionHighlightView); } } break; } switch (event.getAction()) { case MotionEvent.ACTION_UP: center(true, true); break; case MotionEvent.ACTION_MOVE: // if we're not zoomed then there's no point in even allowing // the user to move the image around. This call to center puts // it back to the normalized location (with false meaning don't // animate). if (getScale() == 1F) { center(true, true); } break; } return true; } // Pan the displayed image to make sure the cropping rectangle is visible. private void ensureVisible(HighlightView hv) { Rect r = hv.mDrawRect; int panDeltaX1 = Math.max(0, this.getLeft() - r.left); int panDeltaX2 = Math.min(0, this.getRight() - r.right); int panDeltaY1 = Math.max(0, this.getTop() - r.top); int panDeltaY2 = Math.min(0, this.getBottom() - r.bottom); int panDeltaX = panDeltaX1 != 0 ? panDeltaX1 : panDeltaX2; int panDeltaY = panDeltaY1 != 0 ? panDeltaY1 : panDeltaY2; if (panDeltaX != 0 || panDeltaY != 0) { panBy(panDeltaX, panDeltaY); } } // If the cropping rectangle's size changed significantly, change the // view's center and scale according to the cropping rectangle. private void centerBasedOnHighlightView(HighlightView hv) { Rect drawRect = hv.mDrawRect; float width = drawRect.width(); float height = drawRect.height(); float thisWidth = getWidth(); float thisHeight = getHeight(); float z1 = thisWidth / width * .6F; float z2 = thisHeight / height * .6F; float zoom = Math.min(z1, z2); zoom = zoom * this.getScale(); zoom = Math.max(1F, zoom); if ((Math.abs(zoom - getScale()) / zoom) > .1) { float [] coordinates = new float[] {hv.mCropRect.centerX(), hv.mCropRect.centerY()}; getImageMatrix().mapPoints(coordinates); zoomTo(zoom, coordinates[0], coordinates[1], 300F); } ensureVisible(hv); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); for (int i = 0; i < mHighlightViews.size(); i++) { mHighlightViews.get(i).draw(canvas); } } public void add(HighlightView hv) { mHighlightViews.add(hv); invalidate(); } }