Ios FlowCover effect demo

Demo function: flowcover effect, positive and negative infinite loop scrolling, each cover has a separate reflection

Demo Description: The FlowCover Classes folder in the project stores the core Classes.

Demo diagram:

 

 

Demo main code: drawing part

[Csharp]
-(Void) drawTile :( int) index atOffset :( double) off
{
FlowCoverRecord * fcr = [self getTileAtIndex: index];
GLfloat m [16];
Memset (m, 0, sizeof (m ));
M [10] = 1;
M [15] = 1;
M [0] = 1;
M [5] = 1;
Double trans = off * SPREADIMAGE;

Double f = off * FLANKSPREAD;
If (f <-FLANKSPREAD ){
F =-FLANKSPREAD;
} Else if (f> FLANKSPREAD ){
F = FLANKSPREAD;
}
M [3] =-f;
M [0] = 1-fabs (f );
Double SC = 0.45 * (1-fabs (f ));
Trans + = f * 1;

GlPushMatrix ();
GlBindTexture (GL_TEXTURE_2D, fcr. texture );
GlTranslatef (trans, 0, 0 );
GlScalef (SC, SC, 1.0 );
GlMultMatrixf (m );
GlDrawArrays (GL_TRIANGLE_STRIP, 0, 4 );

// Reflect
GlTranslatef (0,-2, 0 );
GlScalef (1,-1, 1 );
GlColor4f (0.5, 0.5, 0.5, 0.5 );
GlDrawArrays (GL_TRIANGLE_STRIP, 0, 4 );
GlColor4f (1, 1, 1 );

GlPopMatrix ();
}
 
-(Void) draw
{
/*
* Get the current aspect ratio and initialize the viewport
*/

Double aspect = (double) backingWidth)/backingHeight;

GlViewport (0, 0, backingWidth, backingHeight );
GlDisable (GL_DEPTH_TEST); // using painters algorithm

GlClearColor (0, 0, 0 );
GlVertexPointer (3, GL_FLOAT, 0, GVertices );
GlEnableClientState (GL_VERTEX_ARRAY );
GlTexCoordPointer (2, GL_SHORT, 0, GTextures );
GlEnableClientState (GL_TEXTURE_COORD_ARRAY );

Glable (GL_TEXTURE_2D );
GlBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
Glable (GL_BLEND );

/*
* Setup for clear
*/

[EAGLContext setCurrentContext: context];

GlBindFramebufferOES (GL_FRAMEBUFFER_OES, viewFramebuffer );
GlClear (GL_COLOR_BUFFER_BIT );

/*
* Set up the basic coordinate system
*/

GlMatrixMode (GL_PROJECTION );
GlLoadIdentity ();
GlScalef (1, aspect, 1 );
GlMatrixMode (GL_MODELVIEW );
GlLoadIdentity ();

// Modify by chenwh 2010-01-06 for round view begin
/*
* Change from Alesandro Tagliati <alessandro.tagliati@gmail.com>:
* We don't need to draw all the tiles, just the visible ones. We guess
* There are 6 tiles visible; that can be adjusted by altering
* Constant
*/
/*
Int I, len = [self numTiles];
Int mid = (int) floor (offset + 0.5 );
Int iStartPos = mid-VISTILES;
If (iStartPos <0 ){
IStartPos = 0;
}
For (I = iStartPos; I <mid; ++ I ){
[Self drawTile: I atOffset: I-offset];
}

Int iEndPos = mid + VISTILES;
If (iEndPos> = len ){
IEndPos = len-1;
}
For (I = iEndPos; I> = mid; -- I ){
[Self drawTile: I atOffset: I-offset];
}
*/

Int len = [self numTiles];
Int iStartPos =-VISTILES;
Int iEndPos = VISTILES;
Int mid = 0;

Int pageCount = (int) offset;
Double moveOffset;
If (offset <0 ){
MoveOffset = offset-ceil (offset );
} Else {
MoveOffset = offset-floor (offset );
}

Int index, position;
// NSLog (@ "offset = %. 2f, pageCount = % d, moveOffset = %. 2f", offset, pageCount, moveOffset );
For (position = iStartPos; position <mid; ++ position ){
Index = (len + position + pageCount) % len;
If (index <0 ){
Index = len + index;
}
// NSLog (@ "index = % d, position = % d", index, position );
[Self drawTile: index atOffset: position-moveOffset];
}
For (position = iEndPos; position> = mid; -- position ){
Index = (position + pageCount) % len;
If (index <0 ){
Index = len + index;
}
// NSLog (@ "index = % d, position = % d", index, position );
[Self drawTile: index atOffset: position-moveOffset];
}
// Modify by chenwh 2010-01-06 for round view end

GlBindRenderbufferOES (GL_RENDERBUFFER_OES, viewRenderbuffer );
[Context presentRenderbuffer: GL_RENDERBUFFER_OES];
}

-(Void) drawTile :( int) index atOffset :( double) off
{
FlowCoverRecord * fcr = [self getTileAtIndex: index];
GLfloat m [16];
Memset (m, 0, sizeof (m ));
M [10] = 1;
M [15] = 1;
M [0] = 1;
M [5] = 1;
Double trans = off * SPREADIMAGE;
 
Double f = off * FLANKSPREAD;
If (f <-FLANKSPREAD ){
F =-FLANKSPREAD;
} Else if (f> FLANKSPREAD ){
F = FLANKSPREAD;
}
M [3] =-f;
M [0] = 1-fabs (f );
Double SC = 0.45 * (1-fabs (f ));
Trans + = f * 1;
 
GlPushMatrix ();
GlBindTexture (GL_TEXTURE_2D, fcr. texture );
GlTranslatef (trans, 0, 0 );
GlScalef (SC, SC, 1.0 );
GlMultMatrixf (m );
GlDrawArrays (GL_TRIANGLE_STRIP, 0, 4 );
 
// Reflect
GlTranslatef (0,-2, 0 );
GlScalef (1,-1, 1 );
GlColor4f (0.5, 0.5, 0.5, 0.5 );
GlDrawArrays (GL_TRIANGLE_STRIP, 0, 4 );
GlColor4f (1, 1, 1 );
 
GlPopMatrix ();
}

-(Void) draw
{
/*
* Get the current aspect ratio and initialize the viewport
*/
 
Double aspect = (double) backingWidth)/backingHeight;
 
GlViewport (0, 0, backingWidth, backingHeight );
GlDisable (GL_DEPTH_TEST); // using painters algorithm
 
GlClearColor (0, 0, 0 );
GlVertexPointer (3, GL_FLOAT, 0, GVertices );
GlEnableClientState (GL_VERTEX_ARRAY );
GlTexCoordPointer (2, GL_SHORT, 0, GTextures );
GlEnableClientState (GL_TEXTURE_COORD_ARRAY );
 
Glable (GL_TEXTURE_2D );
GlBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
Glable (GL_BLEND );
 
/*
* Setup for clear
*/
 
[EAGLContext setCurrentContext: context];
 
GlBindFramebufferOES (GL_FRAMEBUFFER_OES, viewFramebuffer );
GlClear (GL_COLOR_BUFFER_BIT );
 
/*
* Set up the basic coordinate system
*/
 
GlMatrixMode (GL_PROJECTION );
GlLoadIdentity ();
GlScalef (1, aspect, 1 );
GlMatrixMode (GL_MODELVIEW );
GlLoadIdentity ();
 
// Modify by chenwh 2010-01-06 for round view begin
/*
* Change from Alesandro Tagliati <alessandro.tagliati@gmail.com>:
* We don't need to draw all the tiles, just the visible ones. We guess
* There are 6 tiles visible; that can be adjusted by altering
* Constant
*/
/*
Int I, len = [self numTiles];
Int mid = (int) floor (offset + 0.5 );
Int iStartPos = mid-VISTILES;
If (iStartPos <0 ){
IStartPos = 0;
}
For (I = iStartPos; I <mid; ++ I ){
[Self drawTile: I atOffset: I-offset];
}
 
Int iEndPos = mid + VISTILES;
If (iEndPos> = len ){
IEndPos = len-1;
}
For (I = iEndPos; I> = mid; -- I ){
[Self drawTile: I atOffset: I-offset];
}
*/
 
Int len = [self numTiles];
Int iStartPos =-VISTILES;
Int iEndPos = VISTILES;
Int mid = 0;
 
Int pageCount = (int) offset;
Double moveOffset;
If (offset <0 ){
MoveOffset = offset-ceil (offset );
} Else {
MoveOffset = offset-floor (offset );
}
 
Int index, position;
// NSLog (@ "offset = %. 2f, pageCount = % d, moveOffset = %. 2f", offset, pageCount, moveOffset );
For (position = iStartPos; position <mid; ++ position ){
Index = (len + position + pageCount) % len;
If (index <0 ){
Index = len + index;
}
// NSLog (@ "index = % d, position = % d", index, position );
[Self drawTile: index atOffset: position-moveOffset];
}
For (position = iEndPos; position> = mid; -- position ){
Index = (position + pageCount) % len;
If (index <0 ){
Index = len + index;
}
// NSLog (@ "index = % d, position = % d", index, position );
[Self drawTile: index atOffset: position-moveOffset];
}
// Modify by chenwh 2010-01-06 for round view end
 
GlBindRenderbufferOES (GL_RENDERBUFFER_OES, viewRenderbuffer );
[Context presentRenderbuffer: GL_RENDERBUFFER_OES];
}