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package com.android.browser;
import android.graphics.Bitmap;
import android.graphics.utils.BoundaryPatch;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.webkit.WebView;
/*package*/ class MeshTracker extends WebView.DragTracker {
private static class Mesh {
private int mRows;
private int mCols;
private BoundaryPatch mPatch = new BoundaryPatch();
private float[] mCubics = new float[24];
private float[] mOrig = new float[24];
private float mStretchX, mStretchY;
Mesh(int rows, int cols) {
mRows = rows;
mCols = cols;
}
private void rebuildPatch() {
mPatch.setCubicBoundary(mCubics, 0, mRows, mCols);
}
private void setSize(float w, float h) {
float[] pts = mCubics;
float x1 = w*0.3333f;
float y1 = h*0.3333f;
float x2 = w*0.6667f;
float y2 = h*0.6667f;
pts[0*2+0] = 0; pts[0*2+1] = 0;
pts[1*2+0] = x1; pts[1*2+1] = 0;
pts[2*2+0] = x2; pts[2*2+1] = 0;
pts[3*2+0] = w; pts[3*2+1] = 0;
pts[4*2+0] = w; pts[4*2+1] = y1;
pts[5*2+0] = w; pts[5*2+1] = y2;
pts[6*2+0] = w; pts[6*2+1] = h;
pts[7*2+0] = x2; pts[7*2+1] = h;
pts[8*2+0] = x1; pts[8*2+1] = h;
pts[9*2+0] = 0; pts[9*2+1] = h;
pts[10*2+0] = 0; pts[10*2+1] = y2;
pts[11*2+0] = 0; pts[11*2+1] = y1;
System.arraycopy(pts, 0, mOrig, 0, 24);
// recall our stretcher
setStretch(mStretchX, mStretchY);
}
public void setBitmap(Bitmap bm) {
mPatch.setTexture(bm);
setSize(bm.getWidth(), bm.getHeight());
}
// first experimental behavior
private void doit0(float dx, float dy) {
int index;
if (dx < 0) {
index = 10;
} else {
index = 4;
}
mCubics[index*2 + 0] = mOrig[index*2 + 0] + dx;
mCubics[index*2 + 2] = mOrig[index*2 + 2] + dx;
if (dy < 0) {
index = 1;
} else {
index = 7;
}
mCubics[index*2 + 1] = mOrig[index*2 + 1] + dy;
mCubics[index*2 + 3] = mOrig[index*2 + 3] + dy;
}
private void doit1(float dx, float dy) {
int index;
if (dx < 0) {
index = 4;
} else {
index = 10;
}
mCubics[index*2 + 0] = mOrig[index*2 + 0] + dx;
mCubics[index*2 + 2] = mOrig[index*2 + 2] + dx;
if (dy < 0) {
index = 7;
} else {
index = 1;
}
mCubics[index*2 + 1] = mOrig[index*2 + 1] + dy;
mCubics[index*2 + 3] = mOrig[index*2 + 3] + dy;
}
public void setStretch(float dx, float dy) {
mStretchX = dx;
mStretchY = dy;
doit1(dx, dy);
rebuildPatch();
}
public void draw(Canvas canvas) {
mPatch.draw(canvas);
}
}
private Mesh mMesh;
private Bitmap mBitmap;
public MeshTracker() {}
@Override public void onStartDrag(float x, float y) {
mMesh = new Mesh(16, 16);
}
@Override public void onBitmapChange(Bitmap bm) {
mBitmap = bm;
mMesh.setBitmap(bm);
}
@Override public boolean onStretchChange(float sx, float sy) {
mMesh.setStretch(-sx, -sy);
return true;
}
@Override public void onStopDrag() {
mMesh = null;
}
@Override public void onDraw(Canvas canvas) {
canvas.drawColor(0xFF000000);
Paint paint = new Paint();
paint.setAlpha(0x80);
canvas.drawBitmap(mBitmap, 0, 0, paint);
mMesh.draw(canvas);
}
}
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