Scale To Fit
/*
* Copyright (C) 2007 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.
*/
package app.test;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
public class Test extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mHairPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Matrix mMatrix = new Matrix();
private final RectF mSrcR = new RectF();
private static final Matrix.ScaleToFit[] sFits = new Matrix.ScaleToFit[] {
Matrix.ScaleToFit.FILL, Matrix.ScaleToFit.START,
Matrix.ScaleToFit.CENTER, Matrix.ScaleToFit.END };
private static final String[] sFitLabels = new String[] { "FILL",
"START", "CENTER", "END" };
private static final int[] sSrcData = new int[] { 80, 40, Color.RED,
40, 80, Color.GREEN, 30, 30, Color.BLUE, 80, 80, Color.BLACK };
private static final int N = 4;
private static final int WIDTH = 52;
private static final int HEIGHT = 52;
private final RectF mDstR = new RectF(0, 0, WIDTH, HEIGHT);
public SampleView(Context context) {
super(context);
mHairPaint.setStyle(Paint.Style.STROKE);
mLabelPaint.setTextSize(16);
}
private void setSrcR(int index) {
int w = sSrcData[index * 3 + 0];
int h = sSrcData[index * 3 + 1];
mSrcR.set(0, 0, w, h);
}
private void drawSrcR(Canvas canvas, int index) {
mPaint.setColor(sSrcData[index * 3 + 2]);
canvas.drawOval(mSrcR, mPaint);
}
private void drawFit(Canvas canvas, int index, Matrix.ScaleToFit stf) {
canvas.save();
setSrcR(index);
mMatrix.setRectToRect(mSrcR, mDstR, stf);
canvas.concat(mMatrix);
drawSrcR(canvas, index);
canvas.restore();
canvas.drawRect(mDstR, mHairPaint);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.translate(10, 10);
canvas.save();
for (int i = 0; i < N; i++) {
setSrcR(i);
drawSrcR(canvas, i);
canvas.translate(mSrcR.width() + 15, 0);
}
canvas.restore();
canvas.translate(0, 100);
for (int j = 0; j < sFits.length; j++) {
canvas.save();
for (int i = 0; i < N; i++) {
drawFit(canvas, i, sFits[j]);
canvas.translate(mDstR.width() + 8, 0);
}
canvas.drawText(sFitLabels[j], 0, HEIGHT * 2 / 3, mLabelPaint);
canvas.restore();
canvas.translate(0, 80);
}
}
}
}
class GraphicsActivity extends Activity {
// set to true to test Picture
private static final boolean TEST_PICTURE = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void setContentView(View view) {
if (TEST_PICTURE) {
ViewGroup vg = new PictureLayout(this);
vg.addView(view);
view = vg;
}
super.setContentView(view);
}
}
class PictureLayout extends ViewGroup {
private final Picture mPicture = new Picture();
public PictureLayout(Context context) {
super(context);
}
public PictureLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void addView(View child) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child);
}
@Override
public void addView(View child, int index) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, index);
}
@Override
public void addView(View child, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, params);
}
@Override
public void addView(View child, int index, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException(
"PictureLayout can host only one direct child");
}
super.addView(child, index, params);
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int count = getChildCount();
int maxHeight = 0;
int maxWidth = 0;
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
}
maxWidth += getPaddingLeft() + getPaddingRight();
maxHeight += getPaddingTop() + getPaddingBottom();
Drawable drawable = getBackground();
if (drawable != null) {
maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
}
setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec),
resolveSize(maxHeight, heightMeasureSpec));
}
private void drawPict(Canvas canvas, int x, int y, int w, int h, float sx,
float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(), getHeight()));
mPicture.endRecording();
int x = getWidth() / 2;
int y = getHeight() / 2;
if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}
@Override
public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
location[0] = getLeft();
location[1] = getTop();
dirty.set(0, 0, getWidth(), getHeight());
return getParent();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = super.getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final int childLeft = getPaddingLeft();
final int childTop = getPaddingTop();
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(),
childTop + child.getMeasuredHeight());
}
}
}
}
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