Hi,
Here's some code I've been using for spline creation (or bezier curves to be more exact);
https://github.com/harism/android_effects/blob/master/src/fi/harism/effects/ViewSplines.java
https://github.com/harism/android_effects/blob/master/res/raw/spline_vs.txt
https://github.com/harism/android_effects/blob/master/res/raw/spline_fs.txt
It's 100% GPU based and the idea is to feed vertex shader with following information;
1. 4 control points as uniforms.
2. An vertex array that consists e.g of values [[0.0, -1], [0.0, 1], [0.1, -1], [0.1, 1], …. [1.0, 1]]. The first value is used as 't' for interpolating over the curve. The more accurate division you provide the more smooth curve will be produced. Latter value is used to decide on which side of curve the value is. Meaning you can adjust thickness of the rendered curve.
--
H
On Jan 9, 2013, at 11:38 AM, Tamil Maran <tam.maranbe@gmail.com> wrote:
> hi
>
> i want to draw the curved line and i need to extend and shrink that line using touch event.how to do in opengl
>
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