StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POImplement page curl on android?
text
Body
copied!<p>I was surfing the net looking for a nice effect for turning pages on Android and there just doesn't seem to be one. Since I'm learning the platform it seemed like a nice thing to be able to do is this.</p> <p>I managed to find a page here: <a href="http://wdnuon.blogspot.com/2010/05/implementing-ibooks-page-curling-using.html" rel="noreferrer">http://wdnuon.blogspot.com/2010/05/implementing-ibooks-page-curling-using.html</a></p> <pre><code>- (void)deform { Vertex2f vi; // Current input vertex Vertex3f v1; // First stage of the deformation Vertex3f *vo; // Pointer to the finished vertex CGFloat R, r, beta; for (ushort ii = 0; ii < numVertices_; ii++) { // Get the current input vertex. vi = inputMesh_[ii]; // Radius of the circle circumscribed by vertex (vi.x, vi.y) around A on the x-y plane R = sqrt(vi.x * vi.x + pow(vi.y - A, 2)); // Now get the radius of the cone cross section intersected by our vertex in 3D space. r = R * sin(theta); // Angle subtended by arc |ST| on the cone cross section. beta = asin(vi.x / R) / sin(theta); // *** MAGIC!!! *** v1.x = r * sin(beta); v1.y = R + A - r * (1 - cos(beta)) * sin(theta); v1.z = r * (1 - cos(beta)) * cos(theta); // Apply a basic rotation transform around the y axis to rotate the curled page. // These two steps could be combined through simple substitution, but are left // separate to keep the math simple for debugging and illustrative purposes. vo = &outputMesh_[ii]; vo->x = (v1.x * cos(rho) - v1.z * sin(rho)); vo->y = v1.y; vo->z = (v1.x * sin(rho) + v1.z * cos(rho)); } } </code></pre> <p>that gives an example (above) code for iPhone but I have no idea how I would go about implementing this on android. Could any of the Math gods out there please help me out with how I would go about implementing this in Android Java.</p> <p>Is it possible using the native draw APIs, would I have to use openGL? Could I mimik the behaviour somehow?</p> <p>Any help would be appreciated. Thanks.</p> <p>****************EDIT**********************************************</p> <p>I found a Bitmap Mesh example in the Android API demos: <a href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/BitmapMesh.html" rel="noreferrer">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/BitmapMesh.html</a></p> <p>Maybe someone could help me out on an equation to simply fold the top right corner inward diagnally across the page to create a similar effect that I can later apply shadows to to gie it more depth?</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload