Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2016 Zheng Li <https://lizheng.me>
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.
 */

import android.graphics.Matrix;

import android.graphics.RectF;
import android.view.View;

import java.util.ArrayList;

public class Main {
    public static Matrix IDENTITY_MATRIX = new Matrix() {
        void oops() {
            throw new IllegalStateException("Matrix can not be modified");
        }

        @Override
        public void set(Matrix src) {
            oops();
        }

        @Override
        public void reset() {
            oops();
        }

        @Override
        public void setTranslate(float dx, float dy) {
            oops();
        }

        @Override
        public void setScale(float sx, float sy, float px, float py) {
            oops();
        }

        @Override
        public void setScale(float sx, float sy) {
            oops();
        }

        @Override
        public void setRotate(float degrees, float px, float py) {
            oops();
        }

        @Override
        public void setRotate(float degrees) {
            oops();
        }

        @Override
        public void setSinCos(float sinValue, float cosValue, float px, float py) {
            oops();
        }

        @Override
        public void setSinCos(float sinValue, float cosValue) {
            oops();
        }

        @Override
        public void setSkew(float kx, float ky, float px, float py) {
            oops();
        }

        @Override
        public void setSkew(float kx, float ky) {
            oops();
        }

        @Override
        public boolean setConcat(Matrix a, Matrix b) {
            oops();
            return false;
        }

        @Override
        public boolean preTranslate(float dx, float dy) {
            oops();
            return false;
        }

        @Override
        public boolean preScale(float sx, float sy, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean preScale(float sx, float sy) {
            oops();
            return false;
        }

        @Override
        public boolean preRotate(float degrees, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean preRotate(float degrees) {
            oops();
            return false;
        }

        @Override
        public boolean preSkew(float kx, float ky, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean preSkew(float kx, float ky) {
            oops();
            return false;
        }

        @Override
        public boolean preConcat(Matrix other) {
            oops();
            return false;
        }

        @Override
        public boolean postTranslate(float dx, float dy) {
            oops();
            return false;
        }

        @Override
        public boolean postScale(float sx, float sy, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean postScale(float sx, float sy) {
            oops();
            return false;
        }

        @Override
        public boolean postRotate(float degrees, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean postRotate(float degrees) {
            oops();
            return false;
        }

        @Override
        public boolean postSkew(float kx, float ky, float px, float py) {
            oops();
            return false;
        }

        @Override
        public boolean postSkew(float kx, float ky) {
            oops();
            return false;
        }

        @Override
        public boolean postConcat(Matrix other) {
            oops();
            return false;
        }

        @Override
        public boolean setRectToRect(RectF src, RectF dst, ScaleToFit stf) {
            oops();
            return false;
        }

        @Override
        public boolean setPolyToPoly(float[] src, int srcIndex, float[] dst, int dstIndex, int pointCount) {
            oops();
            return false;
        }

        @Override
        public void setValues(float[] values) {
            oops();
        }
    };

    /**
     * Maps a coordinate in the root to a descendent.
     */
    public static float mapCoordInSelfToDescendent(View descendant, View root, float[] coord,
            Matrix tmpInverseMatrix) {
        ArrayList<View> ancestorChain = new ArrayList<>();

        float[] pt = { coord[0], coord[1] };

        View v = descendant;
        while (v != root) {
            ancestorChain.add(v);
            v = (View) v.getParent();
        }
        ancestorChain.add(root);

        float scale = 1.0f;
        int count = ancestorChain.size();
        tmpInverseMatrix.set(IDENTITY_MATRIX);
        for (int i = count - 1; i >= 0; i--) {
            View ancestor = ancestorChain.get(i);
            View next = i > 0 ? ancestorChain.get(i - 1) : null;

            pt[0] += ancestor.getScrollX();
            pt[1] += ancestor.getScrollY();

            if (next != null) {
                pt[0] -= next.getLeft();
                pt[1] -= next.getTop();
                next.getMatrix().invert(tmpInverseMatrix);
                tmpInverseMatrix.mapPoints(pt);
                scale *= next.getScaleX();
            }
        }

        coord[0] = pt[0];
        coord[1] = pt[1];
        return scale;
    }
}