ios FlowCover效果demo

demo功能：flowcover 效果，正反无限循环滚动，每个cover都有单独的倒影

demo说明：项目中FlowCover Classes文件夹是存放核心类。

demo接图：

demo主要代码：绘制部分

- (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);// reflectglTranslatef(0,-2,0);glScalef(1,-1,1);glColor4f(0.5,0.5,0.5,0.5);glDrawArrays(GL_TRIANGLE_STRIP,0,4);glColor4f(1,1,1,1);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 algorithmglClearColor(0,0,0,0);glVertexPointer(3,GL_FLOAT,0,GVertices);glEnableClientState(GL_VERTEX_ARRAY);glTexCoordPointer(2, GL_SHORT, 0, GTextures);glEnableClientState(GL_TEXTURE_COORD_ARRAY);glEnable(GL_TEXTURE_2D);glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);glEnable(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 <[e-mail]>: *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 the  *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 endglBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);[context presentRenderbuffer:GL_RENDERBUFFER_OES];}

demo下载地址：http://download.csdn.net/detail/donny_zhang/5544499