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MIT License
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/* * Copyright (C) 2007 The Android Open Source Project *//w w w. ja v a 2 s. c o m * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package gr.sv1jsb.cropimage; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Region; import android.graphics.drawable.Drawable; import android.view.View; // This class is used by CropImage to display a highlighted cropping rectangle // overlayed with the image. There are two coordinate spaces in use. One is // image, another is screen. computeLayout() uses mMatrix to map from image // space to screen space. class HighlightView { @SuppressWarnings("unused") private static final String TAG = "HighlightView"; View mContext; // The View displaying the image. public static final int GROW_NONE = (1 << 0); public static final int GROW_LEFT_EDGE = (1 << 1); public static final int GROW_RIGHT_EDGE = (1 << 2); public static final int GROW_TOP_EDGE = (1 << 3); public static final int GROW_BOTTOM_EDGE = (1 << 4); public static final int MOVE = (1 << 5); public HighlightView(View ctx) { mContext = ctx; } private void init() { android.content.res.Resources resources = mContext.getResources(); mResizeDrawableWidth = resources.getDrawable(R.drawable.camera_crop_width); mResizeDrawableHeight = resources.getDrawable(R.drawable.camera_crop_height); mResizeDrawableDiagonal = resources.getDrawable(R.drawable.indicator_autocrop); } boolean mIsFocused; boolean mHidden; public boolean hasFocus() { return mIsFocused; } public void setFocus(boolean f) { mIsFocused = f; } public void setHidden(boolean hidden) { mHidden = hidden; } protected void draw(Canvas canvas) { if (mHidden) { return; } Path path = new Path(); if (!hasFocus()) { mOutlinePaint.setColor(0xFF000000); canvas.drawRect(mDrawRect, mOutlinePaint); } else { Rect viewDrawingRect = new Rect(); mContext.getDrawingRect(viewDrawingRect); if (mCircle) { canvas.save(); float width = mDrawRect.width(); float height = mDrawRect.height(); path.addCircle(mDrawRect.left + (width / 2), mDrawRect.top + (height / 2), width / 2, Path.Direction.CW); mOutlinePaint.setColor(0xFFEF04D6); canvas.clipPath(path, Region.Op.DIFFERENCE); canvas.drawRect(viewDrawingRect, hasFocus() ? mFocusPaint : mNoFocusPaint); canvas.restore(); } else { Rect topRect = new Rect(viewDrawingRect.left, viewDrawingRect.top, viewDrawingRect.right, mDrawRect.top ); if (topRect.width() > 0 && topRect.height() > 0) { canvas.drawRect(topRect, hasFocus() ? mFocusPaint : mNoFocusPaint); } Rect bottomRect = new Rect(viewDrawingRect.left, mDrawRect.bottom, viewDrawingRect.right, viewDrawingRect.bottom); if (bottomRect.width() > 0 && bottomRect.height() > 0) { canvas.drawRect(bottomRect, hasFocus() ? mFocusPaint : mNoFocusPaint); } Rect leftRect = new Rect(viewDrawingRect.left, topRect.bottom, mDrawRect.left, bottomRect.top); if (leftRect.width() > 0 && leftRect.height() > 0) { canvas.drawRect(leftRect, hasFocus() ? mFocusPaint : mNoFocusPaint); } Rect rightRect = new Rect(mDrawRect.right, topRect.bottom, viewDrawingRect.right, bottomRect.top); if (rightRect.width() > 0 && rightRect.height() > 0) { canvas.drawRect(rightRect, hasFocus() ? mFocusPaint : mNoFocusPaint); } path.addRect(new RectF(mDrawRect), Path.Direction.CW); mOutlinePaint.setColor(0xFFFF8A00); } canvas.drawPath(path, mOutlinePaint); if (mMode == ModifyMode.Grow) { if (mCircle) { int width = mResizeDrawableDiagonal.getIntrinsicWidth(); int height = mResizeDrawableDiagonal.getIntrinsicHeight(); int d = (int) Math.round(Math.cos(/*45deg*/Math.PI / 4D) * (mDrawRect.width() / 2D)); int x = mDrawRect.left + (mDrawRect.width() / 2) + d - width / 2; int y = mDrawRect.top + (mDrawRect.height() / 2) - d - height / 2; mResizeDrawableDiagonal.setBounds(x, y, x + mResizeDrawableDiagonal.getIntrinsicWidth(), y + mResizeDrawableDiagonal.getIntrinsicHeight()); mResizeDrawableDiagonal.draw(canvas); } else { int left = mDrawRect.left + 1; int right = mDrawRect.right + 1; int top = mDrawRect.top + 4; int bottom = mDrawRect.bottom + 3; int widthWidth = mResizeDrawableWidth.getIntrinsicWidth() / 2; int widthHeight = mResizeDrawableWidth.getIntrinsicHeight() / 2; int heightHeight = mResizeDrawableHeight.getIntrinsicHeight() / 2; int heightWidth = mResizeDrawableHeight.getIntrinsicWidth() / 2; int xMiddle = mDrawRect.left + ((mDrawRect.right - mDrawRect.left) / 2); int yMiddle = mDrawRect.top + ((mDrawRect.bottom - mDrawRect.top) / 2); mResizeDrawableWidth.setBounds(left - widthWidth, yMiddle - widthHeight, left + widthWidth, yMiddle + widthHeight); mResizeDrawableWidth.draw(canvas); mResizeDrawableWidth.setBounds(right - widthWidth, yMiddle - widthHeight, right + widthWidth, yMiddle + widthHeight); mResizeDrawableWidth.draw(canvas); mResizeDrawableHeight.setBounds(xMiddle - heightWidth, top - heightHeight, xMiddle + heightWidth, top + heightHeight); mResizeDrawableHeight.draw(canvas); mResizeDrawableHeight.setBounds(xMiddle - heightWidth, bottom - heightHeight, xMiddle + heightWidth, bottom + heightHeight); mResizeDrawableHeight.draw(canvas); } } } } public ModifyMode getMode() { return mMode; } public void setMode(ModifyMode mode) { if (mode != mMode) { mMode = mode; mContext.invalidate(); } } // Determines which edges are hit by touching at (x, y). public int getHit(float x, float y) { Rect r = computeLayout(); final float hysteresis = 20F; int retval = GROW_NONE; if (mCircle) { float distX = x - r.centerX(); float distY = y - r.centerY(); int distanceFromCenter = (int) Math.sqrt(distX * distX + distY * distY); int radius = mDrawRect.width() / 2; int delta = distanceFromCenter - radius; if (Math.abs(delta) <= hysteresis) { if (Math.abs(distY) > Math.abs(distX)) { if (distY < 0) { retval = GROW_TOP_EDGE; } else { retval = GROW_BOTTOM_EDGE; } } else { if (distX < 0) { retval = GROW_LEFT_EDGE; } else { retval = GROW_RIGHT_EDGE; } } } else if (distanceFromCenter < radius) { retval = MOVE; } else { retval = GROW_NONE; } } else { // verticalCheck makes sure the position is between the top and // the bottom edge (with some tolerance). Similar for horizCheck. boolean verticalCheck = (y >= r.top - hysteresis) && (y < r.bottom + hysteresis); boolean horizCheck = (x >= r.left - hysteresis) && (x < r.right + hysteresis); // Check whether the position is near some edge(s). if ((Math.abs(r.left - x) < hysteresis) && verticalCheck) { retval |= GROW_LEFT_EDGE; } if ((Math.abs(r.right - x) < hysteresis) && verticalCheck) { retval |= GROW_RIGHT_EDGE; } if ((Math.abs(r.top - y) < hysteresis) && horizCheck) { retval |= GROW_TOP_EDGE; } if ((Math.abs(r.bottom - y) < hysteresis) && horizCheck) { retval |= GROW_BOTTOM_EDGE; } // Not near any edge but inside the rectangle: move. if (retval == GROW_NONE && r.contains((int) x, (int) y)) { retval = MOVE; } } return retval; } // Handles motion (dx, dy) in screen space. // The "edge" parameter specifies which edges the user is dragging. void handleMotion(int edge, float dx, float dy) { Rect r = computeLayout(); if (edge == GROW_NONE) { return; } else if (edge == MOVE) { // Convert to image space before sending to moveBy(). moveBy(dx * (mCropRect.width() / r.width()), dy * (mCropRect.height() / r.height())); } else { if (((GROW_LEFT_EDGE | GROW_RIGHT_EDGE) & edge) == 0) { dx = 0; } if (((GROW_TOP_EDGE | GROW_BOTTOM_EDGE) & edge) == 0) { dy = 0; } // Convert to image space before sending to growBy(). float xDelta = dx * (mCropRect.width() / r.width()); float yDelta = dy * (mCropRect.height() / r.height()); growBy((((edge & GROW_LEFT_EDGE) != 0) ? -1 : 1) * xDelta, (((edge & GROW_TOP_EDGE) != 0) ? -1 : 1) * yDelta); } } // Grows the cropping rectange by (dx, dy) in image space. void moveBy(float dx, float dy) { Rect invalRect = new Rect(mDrawRect); mCropRect.offset(dx, dy); // Put the cropping rectangle inside image rectangle. mCropRect.offset( Math.max(0, mImageRect.left - mCropRect.left), Math.max(0, mImageRect.top - mCropRect.top)); mCropRect.offset( Math.min(0, mImageRect.right - mCropRect.right), Math.min(0, mImageRect.bottom - mCropRect.bottom)); mDrawRect = computeLayout(); invalRect.union(mDrawRect); invalRect.inset(-10, -10); mContext.invalidate(invalRect); } // Grows the cropping rectange by (dx, dy) in image space. void growBy(float dx, float dy) { if (mMaintainAspectRatio) { if (dx != 0) { dy = dx / mInitialAspectRatio; } else if (dy != 0) { dx = dy * mInitialAspectRatio; } } // Don't let the cropping rectangle grow too fast. // Grow at most half of the difference between the image rectangle and // the cropping rectangle. RectF r = new RectF(mCropRect); if (dx > 0F && r.width() + 2 * dx > mImageRect.width()) { float adjustment = (mImageRect.width() - r.width()) / 2F; dx = adjustment; if (mMaintainAspectRatio) { dy = dx / mInitialAspectRatio; } } if (dy > 0F && r.height() + 2 * dy > mImageRect.height()) { float adjustment = (mImageRect.height() - r.height()) / 2F; dy = adjustment; if (mMaintainAspectRatio) { dx = dy * mInitialAspectRatio; } } r.inset(-dx, -dy); // Don't let the cropping rectangle shrink too fast. final float widthCap = 25F; if (r.width() < widthCap) { r.inset(-(widthCap - r.width()) / 2F, 0F); } float heightCap = mMaintainAspectRatio ? (widthCap / mInitialAspectRatio) : widthCap; if (r.height() < heightCap) { r.inset(0F, -(heightCap - r.height()) / 2F); } // Put the cropping rectangle inside the image rectangle. if (r.left < mImageRect.left) { r.offset(mImageRect.left - r.left, 0F); } else if (r.right > mImageRect.right) { r.offset(-(r.right - mImageRect.right), 0); } if (r.top < mImageRect.top) { r.offset(0F, mImageRect.top - r.top); } else if (r.bottom > mImageRect.bottom) { r.offset(0F, -(r.bottom - mImageRect.bottom)); } mCropRect.set(r); mDrawRect = computeLayout(); mContext.invalidate(); } // Returns the cropping rectangle in image space. public Rect getCropRect() { return new Rect((int) mCropRect.left, (int) mCropRect.top, (int) mCropRect.right, (int) mCropRect.bottom); } // Maps the cropping rectangle from image space to screen space. private Rect computeLayout() { RectF r = new RectF(mCropRect.left, mCropRect.top, mCropRect.right, mCropRect.bottom); mMatrix.mapRect(r); return new Rect(Math.round(r.left), Math.round(r.top), Math.round(r.right), Math.round(r.bottom)); } public void invalidate() { mDrawRect = computeLayout(); } public void setup(Matrix m, Rect imageRect, RectF cropRect, boolean circle, boolean maintainAspectRatio) { if (circle) { maintainAspectRatio = true; } mMatrix = new Matrix(m); mCropRect = cropRect; mImageRect = new RectF(imageRect); mMaintainAspectRatio = maintainAspectRatio; mCircle = circle; mInitialAspectRatio = mCropRect.width() / mCropRect.height(); mDrawRect = computeLayout(); mFocusPaint.setARGB(125, 50, 50, 50); mNoFocusPaint.setARGB(125, 50, 50, 50); mOutlinePaint.setStrokeWidth(3F); mOutlinePaint.setStyle(Paint.Style.STROKE); mOutlinePaint.setAntiAlias(true); mMode = ModifyMode.None; init(); } enum ModifyMode {None, Move, Grow} private ModifyMode mMode = ModifyMode.None; Rect mDrawRect; // in screen space private RectF mImageRect; // in image space RectF mCropRect; // in image space Matrix mMatrix; private boolean mMaintainAspectRatio = false; private float mInitialAspectRatio; private boolean mCircle = false; private Drawable mResizeDrawableWidth; private Drawable mResizeDrawableHeight; private Drawable mResizeDrawableDiagonal; private final Paint mFocusPaint = new Paint(); private final Paint mNoFocusPaint = new Paint(); private final Paint mOutlinePaint = new Paint(); }