Distorted Android

///////////////////////////////////////////////////////////////////////////////////////////////////

// Pull P=(v.x,v.y) towards the line that

// a) passes through the center of the effect

// b) forms angle defined in the 2nd interpolated value with the X-axis

// with P' = P + (1-h)*dist(line to P)

// when h>1 we are pushing points away from S: P' = P + (1/h-1)*dist(line to P)

  public static void enable()

    {

    addEffect(EffectName.PINCH,

        "vec2 center = vUniforms[effect+1].yz; \n"

      + "vec2 ps = center-v.xy; \n"

      + "float h = vUniforms[effect].x; \n"

      + "float t = degree(vUniforms[effect+2],center,ps) * (1.0-h)/max(1.0,h); \n"

      + "float angle = vUniforms[effect].y; \n"

      + "vec2 dir = vec2(sin(angle),-cos(angle)); \n"

      + "v.xy += t*dot(ps,dir)*dir;"

      );

    }