在我的
Android应用程序中,我想应用
Photo Warp和
Photo Deformer应用程序中提供的图像扭曲效果.为此,我使用了BitmapMesh.问题是,它不能保存扭曲的图像.每当我触摸图像时,它都会刷新图像并且不会保存我之前变形的图像.我想在用户执行扭曲操作时保存该图像.我在这里发布我的代码.这里我使用“BitmapMesh”活动来对图像执行扭曲效果.
请帮我解决这个问题.
谢谢.
码：
BitmapMesh活动：
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.os.Bundle;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
public class BitmapMesh extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private static final int WIDTH = 20;
private static final int HEIGHT = 20;
private static final int COUNT = (WIDTH + 1) * (HEIGHT + 1);
private final Bitmap mBitmap;
private final float[] mVerts = new float[COUNT * 2];
private final float[] mOrig = new float[COUNT * 2];
private final Matrix mMatrix = new Matrix();
private final Matrix mInverse = new Matrix();
private static void setXY(float[] array,int index,float x,float y) {
array[index * 2 + 0] = x;
array[index * 2 + 1] = y;
}
public SampleView(Context context) {
super(context);
setFocusable(true);
mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.image1);
float w = mBitmap.getWidth();
float h = mBitmap.getHeight();
// construct our mesh
int index = 0;
for (int y = 0; y <= HEIGHT; y++) {
float fy = h * y / HEIGHT;
for (int x = 0; x <= WIDTH; x++) {
float fx = w * x / WIDTH;
setXY(mVerts,index,fx,fy);
setXY(mOrig,fy);
index += 1;
}
}
mMatrix.setTranslate(10,10);
mMatrix.invert(mInverse);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC);
canvas.concat(mMatrix);
canvas.drawBitmapMesh(mBitmap,WIDTH,HEIGHT,mVerts,null,null);
}
private void warp(float cx,float cy) {
final float K = 10000;
float[] src = mOrig;
float[] dst = mVerts;
for (int i = 0; i < COUNT * 2; i += 2) {
float x = src[i + 0];
float y = src[i + 1];
float dx = cx - x;
float dy = cy - y;
float dd = dx * dx + dy * dy;
float d = FloatMath.sqrt(dd);
float pull = K / (dd + 0.000001f);
pull /= (d + 0.000001f);
// android.util.Log.d("skia","index " + i + " dist=" + d +
// " pull=" + pull);
if (pull >= 1) {
dst[i + 0] = cx;
dst[i + 1] = cy;
} else {
dst[i + 0] = x + dx * pull;
dst[i + 1] = y + dy * pull;
}
}
}
private int mLastWarpX = -9999; // don't match a touch coordinate
private int mLastWarpY;
@Override
public boolean onTouchEvent(MotionEvent event) {
float[] pt = { event.getX(),event.getY() };
mInverse.mapPoints(pt);
int x = (int) pt[0];
int y = (int) pt[1];
if (mLastWarpX != x || mLastWarpY != y) {
mLastWarpX = x;
mLastWarpY = y;
warp(pt[0],pt[1]);
invalidate();
}
return true;
}
}
}
图形活动：
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
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);
}
}
PictureLayout.java
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
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,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,w,h);
canvas.scale(0.5f,0.5f);
canvas.scale(sx,sy,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,x,y,1,1);
drawPict(canvas,-1,-1);
drawPict(canvas,-1);
}
}
@Override
public ViewParent invalidateChildInParent(int[] location,Rect dirty) {
location[0] = getLeft();
location[1] = getTop();
dirty.set(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());
}
}
}
}
解决方法
//Little changes in this piece of code
float[] dst; //Global
public SampleView(Context context) {
super(context);
setFocusable(true);
mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.image1);
float w = mBitmap.getWidth();
float h = mBitmap.getHeight();
// construct our mesh
int index = 0;
for (int y = 0; y <= HEIGHT; y++) {
float fy = h * y / HEIGHT;
for (int x = 0; x <= WIDTH; x++) {
float fx = w * x / WIDTH;
setXY(mVerts,fy);
setXY(mOrig,fy);
index += 1;
dst=mVerts;//Assign dst here just once
}
}
mMatrix.setTranslate(10,10);
mMatrix.invert(mInverse);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC);
canvas.concat(mMatrix);
canvas.drawBitmapMesh(mBitmap,null);
}
private void warp(float cx,float cy) {
final float K = 10000;
float[] src = dst; //now you are applying wrap effect on the last effected pixels
for (int i = 0; i < COUNT * 2; i += 2) {
float x = src[i + 0];
float y = src[i + 1];
float dx = cx - x;
float dy = cy - y;
float dd = dx * dx + dy * dy;
float d = FloatMath.sqrt(dd);
float pull = K / (dd + 0.000001f);
pull /= (d + 0.000001f);
// android.util.Log.d("skia","index " + i + " dist=" + d +
// " pull=" + pull);
if (pull >= 1) {
dst[i + 0] = cx;
dst[i + 1] = cy;
} else {
dst[i + 0] = x + dx * pull;
dst[i + 1] = y + dy * pull;
}
}
}
