105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
/*
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* Copyright 2016 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.drawable;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.graphics.drawable.Drawable;
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import com.hippo.yorozuya.MathUtils;
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/**
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* Show a part of the original drawable
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*/
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public class PreciselyClipDrawable extends DrawableWrapper {
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private final boolean mClip;
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private RectF mScale;
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private Rect mTemp;
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public PreciselyClipDrawable(Drawable drawable, int offsetX, int offsetY, int width, int height) {
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super(drawable);
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float originWidth = drawable.getIntrinsicWidth();
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float originHeight = drawable.getIntrinsicHeight();
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if (originWidth <= 0 || originHeight <= 0) {
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// Can not clip
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mClip = false;
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} else {
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mClip = true;
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mScale = new RectF();
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mScale.set(MathUtils.clamp(offsetX / originWidth, 0.0f, 1.0f),
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MathUtils.clamp(offsetY / originHeight, 0.0f, 1.0f),
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MathUtils.clamp((offsetX + width) / originWidth, 0.0f, 1.0f),
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MathUtils.clamp((offsetY + height) / originHeight, 0.0f, 1.0f));
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mTemp = new Rect();
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}
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}
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@Override
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protected void onBoundsChange(Rect bounds) {
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if (mClip) {
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if (!mScale.isEmpty()) {
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mTemp.left = (int) ((mScale.left * bounds.right - mScale.right * bounds.left) /
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(mScale.left * (1 - mScale.right) - mScale.right * (1 - mScale.left)));
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mTemp.right = (int) (((1 - mScale.right) * bounds.left - (1 - mScale.left) * bounds.right) /
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(mScale.left * (1 - mScale.right) - mScale.right * (1 - mScale.left)));
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mTemp.top = (int) ((mScale.top * bounds.bottom - mScale.bottom * bounds.top) /
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(mScale.top * (1 - mScale.bottom) - mScale.bottom * (1 - mScale.top)));
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mTemp.bottom = (int) (((1 - mScale.bottom) * bounds.top - (1 - mScale.top) * bounds.bottom) /
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(mScale.top * (1 - mScale.bottom) - mScale.bottom * (1 - mScale.top)));
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super.onBoundsChange(mTemp);
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}
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} else {
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super.onBoundsChange(bounds);
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}
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}
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@Override
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public int getIntrinsicWidth() {
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if (mClip) {
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return (int) (super.getIntrinsicWidth() * mScale.width());
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} else {
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return super.getIntrinsicWidth();
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}
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}
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@Override
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public int getIntrinsicHeight() {
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if (mClip) {
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return (int) (super.getIntrinsicHeight() * mScale.height());
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} else {
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return super.getIntrinsicHeight();
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}
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}
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@Override
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public void draw(Canvas canvas) {
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if (mClip) {
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if (!mScale.isEmpty()) {
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int saveCount = canvas.save();
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canvas.clipRect(getBounds());
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super.draw(canvas);
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canvas.restoreToCount(saveCount);
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}
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} else {
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super.draw(canvas);
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}
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}
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}
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