/** Sets mPageCurl curl position. */
private void setCurlPos(PointF curlPos, PointF curlDir, double radius) {
// First reposition curl so that page doesn't 'rip off' from book.
if (mCurlState == CURL_RIGHT || (mCurlState == CURL_LEFT && mViewMode == SHOW_ONE_PAGE)) {
RectF pageRect = mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT);
if (curlPos.x >= pageRect.right) {
mPageCurl.reset();
requestRender();
return;
}
if (curlPos.x < pageRect.left) {
curlPos.x = pageRect.left;
}
if (curlDir.y != 0) {
float diffX = curlPos.x - pageRect.left;
float leftY = curlPos.y + (diffX * curlDir.x / curlDir.y);
if (curlDir.y < 0 && leftY < pageRect.top) {
curlDir.x = curlPos.y - pageRect.top;
curlDir.y = pageRect.left - curlPos.x;
} else if (curlDir.y > 0 && leftY > pageRect.bottom) {
curlDir.x = pageRect.bottom - curlPos.y;
curlDir.y = curlPos.x - pageRect.left;
}
}
} else if (mCurlState == CURL_LEFT) {
RectF pageRect = mRenderer.getPageRect(CurlRenderer.PAGE_LEFT);
if (curlPos.x <= pageRect.left) {
mPageCurl.reset();
requestRender();
return;
}
if (curlPos.x > pageRect.right) {
curlPos.x = pageRect.right;
}
if (curlDir.y != 0) {
float diffX = curlPos.x - pageRect.right;
float rightY = curlPos.y + (diffX * curlDir.x / curlDir.y);
if (curlDir.y < 0 && rightY < pageRect.top) {
curlDir.x = pageRect.top - curlPos.y;
curlDir.y = curlPos.x - pageRect.right;
} else if (curlDir.y > 0 && rightY > pageRect.bottom) {
curlDir.x = curlPos.y - pageRect.bottom;
curlDir.y = pageRect.right - curlPos.x;
}
}
}
// Finally normalize direction vector and do rendering.
double dist = Math.sqrt(curlDir.x * curlDir.x + curlDir.y * curlDir.y);
if (dist != 0) {
curlDir.x /= dist;
curlDir.y /= dist;
mPageCurl.curl(curlPos, curlDir, radius);
} else {
mPageCurl.reset();
}
requestRender();
}
@Override
public void onSurfaceCreated() {
// In case surface is recreated, let page meshes drop allocated texture
// ids and ask for new ones. There's no need to set textures here as
// onPageSizeChanged should be called later on.
mPageLeft.resetTexture();
mPageRight.resetTexture();
mPageCurl.resetTexture();
}
/**
* Sets view mode. Value can be either SHOW_ONE_PAGE or SHOW_TWO_PAGES. In former case right page
* is made size of display, and in latter case two pages are laid on visible area.
*/
public void setViewMode(int viewMode) {
switch (viewMode) {
case SHOW_ONE_PAGE:
mViewMode = viewMode;
mPageLeft.setFlipTexture(true);
mRenderer.setViewMode(CurlRenderer.SHOW_ONE_PAGE);
break;
case SHOW_TWO_PAGES:
mViewMode = viewMode;
mPageLeft.setFlipTexture(false);
mRenderer.setViewMode(CurlRenderer.SHOW_TWO_PAGES);
break;
}
}
/** Initialize method. */
private void init(Context ctx) {
this.handler = new Handler();
mRenderer = new CurlRenderer(this);
setEGLContextClientVersion(2);
setRenderer(mRenderer);
setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
setOnTouchListener(this);
// Even though left and right pages are static we have to allocate room
// for curl on them too as we are switching meshes. Another way would be
// to swap texture ids only.
mPageLeft = new CurlMesh(10);
mPageRight = new CurlMesh(10);
mPageCurl = new CurlMesh(10);
mPageLeft.setFlipTexture(true);
mPageRight.setFlipTexture(false);
}
@Override
public void onDrawFrame() {
// We are not animating.
if (mAnimate == false) {
return;
}
long currentTime = System.currentTimeMillis();
// If animation is done.
if (currentTime >= mAnimationStartTime + mAnimationDurationTime) {
if (mAnimationTargetEvent == SET_CURL_TO_RIGHT) {
// Switch curled page to right.
CurlMesh right = mPageCurl;
CurlMesh curl = mPageRight;
right.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
right.setFlipTexture(false);
right.reset();
mRenderer.removeCurlMesh(curl);
mPageCurl = curl;
mPageRight = right;
// If we were curling left page update current index.
if (mCurlState == CURL_LEFT) {
--mCurrentIndex;
}
} else if (mAnimationTargetEvent == SET_CURL_TO_LEFT) {
// Switch curled page to left.
CurlMesh left = mPageCurl;
CurlMesh curl = mPageLeft;
left.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
left.setFlipTexture(true);
left.reset();
mRenderer.removeCurlMesh(curl);
if (!mRenderLeftPage) {
mRenderer.removeCurlMesh(left);
}
mPageCurl = curl;
mPageLeft = left;
// If we were curling right page update current index.
if (mCurlState == CURL_RIGHT) {
++mCurrentIndex;
}
}
mCurlState = CURL_NONE;
mAnimate = false;
requestRender();
} else {
mPointerPos.mPos.set(mAnimationSource);
float t = 1f - ((float) (currentTime - mAnimationStartTime) / mAnimationDurationTime);
t = 1f - (t * t * t * (3 - 2 * t));
mPointerPos.mPos.x += (mAnimationTarget.x - mAnimationSource.x) * t;
mPointerPos.mPos.y += (mAnimationTarget.y - mAnimationSource.y) * t;
updateCurlPos(mPointerPos);
}
}
/** Updates bitmaps for page meshes. */
private void updatePages() {
Log.d("artbook", ">>>>>update page(s): " + Thread.currentThread());
if (mPageProvider == null || mPageBitmapWidth <= 0 || mPageBitmapHeight <= 0) {
return;
}
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
int leftIdx = mCurrentIndex - 1;
int rightIdx = mCurrentIndex;
int curlIdx = -1;
if (mCurlState == CURL_LEFT) {
curlIdx = leftIdx;
--leftIdx;
} else if (mCurlState == CURL_RIGHT) {
curlIdx = rightIdx;
++rightIdx;
}
if (rightIdx >= 0 && rightIdx < mPageProvider.getPageCount()) {
updatePage(mPageRight.getTexturePage(), rightIdx);
mPageRight.setFlipTexture(false);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
if (leftIdx >= 0 && leftIdx < mPageProvider.getPageCount()) {
updatePage(mPageLeft.getTexturePage(), leftIdx);
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
if (curlIdx >= 0 && curlIdx < mPageProvider.getPageCount()) {
updatePage(mPageCurl.getTexturePage(), curlIdx);
if (mCurlState == CURL_RIGHT) {
mPageCurl.setFlipTexture(true);
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
} else {
mPageCurl.setFlipTexture(false);
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
}
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
}
}
/** Switches meshes and loads new bitmaps if available. Updated to support 2 pages in landscape */
private void startCurl(int page) {
switch (page) {
// Once right side page is curled, first right page is assigned into
// curled page. And if there are more bitmaps available new bitmap is
// loaded into right side mesh.
case CURL_RIGHT:
{
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
// We are curling right page.
CurlMesh curl = mPageRight;
mPageRight = mPageCurl;
mPageCurl = curl;
if (mCurrentIndex > 0) {
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
if (mCurrentIndex < mPageProvider.getPageCount() - 1) {
updatePage(mPageRight.getTexturePage(), mCurrentIndex + 1);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.setFlipTexture(false);
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
// Add curled page to renderer.
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageCurl.setFlipTexture(false);
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
mCurlState = CURL_RIGHT;
break;
}
// On left side curl, left page is assigned to curled page. And if
// there are more bitmaps available before currentIndex, new bitmap
// is loaded into left page.
case CURL_LEFT:
{
// Remove meshes from renderer.
mRenderer.removeCurlMesh(mPageLeft);
mRenderer.removeCurlMesh(mPageRight);
mRenderer.removeCurlMesh(mPageCurl);
// We are curling left page.
CurlMesh curl = mPageLeft;
mPageLeft = mPageCurl;
mPageCurl = curl;
if (mCurrentIndex > 1) {
updatePage(mPageLeft.getTexturePage(), mCurrentIndex - 2);
mPageLeft.setFlipTexture(true);
mPageLeft.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageLeft.reset();
if (mRenderLeftPage) {
mRenderer.addCurlMesh(mPageLeft);
}
}
// If there is something to show on right page add it to renderer.
if (mCurrentIndex < mPageProvider.getPageCount()) {
mPageRight.setFlipTexture(false);
mPageRight.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageRight.reset();
mRenderer.addCurlMesh(mPageRight);
}
// How dragging previous page happens depends on view mode.
if (mViewMode == SHOW_ONE_PAGE
|| (mCurlState == CURL_LEFT && mViewMode == SHOW_TWO_PAGES)) {
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_RIGHT));
mPageCurl.setFlipTexture(false);
} else {
mPageCurl.setRect(mRenderer.getPageRect(CurlRenderer.PAGE_LEFT));
mPageCurl.setFlipTexture(true);
}
mPageCurl.reset();
mRenderer.addCurlMesh(mPageCurl);
mCurlState = CURL_LEFT;
break;
}
}
}
