Smooth List Scroll
Post: #1
Hi,
I am doing the scrolling of the image-lists in Opengl.
I have done the scrolling by translating with textures.
But there is jerk on translation.
It want to make it smooth and fast.
Please let me know any efficient way to implement the smooth scroll.
Thanks,
Arun AC
I am doing the scrolling of the image-lists in Opengl.
I have done the scrolling by translating with textures.
But there is jerk on translation.
It want to make it smooth and fast.
Please let me know any efficient way to implement the smooth scroll.
Thanks,
Arun AC
Post: #2
Try this.
Code:
// assume x1, x2, y1, y2, t, and scrollTime are defined above
// where t = {0..scrollTime}
GLfloat dx = x2 - x1;
GLfloat dy = y2 - y1;
// take a look at a graph of the equation y = .5 - .5 * cos( π * x )
GLfloat smoothingFactor = .5 - .5 * cos(Ï€ * t / scrollTime);
GLfloat x = x1 + smoothingFactor * dx;
GLfloat y = y1 + smoothingFactor * dy;
glTranslatef( x, y, .. );
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