Index: ui/gfx/geometry/cubic_bezier.h |
diff --git a/ui/gfx/geometry/cubic_bezier.h b/ui/gfx/geometry/cubic_bezier.h |
index 645dfb7106de68d0cf001a4175cb364c45b409b5..66d5e8a514012c623c3f8d9152599cd9e355183e 100644 |
--- a/ui/gfx/geometry/cubic_bezier.h |
+++ b/ui/gfx/geometry/cubic_bezier.h |
@@ -18,6 +18,9 @@ class GFX_EXPORT CubicBezier { |
// Returns an approximation of y at the given x. |
double Solve(double x) const; |
+ // Returns an approximation of dy/dx at the given x. |
+ double Slope(double x) const; |
+ |
// Sets |min| and |max| to the bezier's minimum and maximium y values in the |
// interval [0, 1]. |
void Range(double* min, double* max) const; |