Clamping (graphics)
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In computer science, clamping, or clipping is the process of limiting a value to a range between a minimum and a maximum value. Unlike wrapping, clamping merely moves the point to the nearest available value.
| Y = clamp(X, 1, 3) | |
|---|---|
| X | Y |
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 3 |
In Python, clamping can be defined as follows:
def clamp(x, minimum, maximum): if x < minimum: return minimum if x > maximum: return maximum return x This is equivalent to max(minimum, min(x, maximum)) for languages that support the functions min and max.
Uses
[edit]Several programming languages and libraries provide functions for fast and vectorized clamping. In Python, the pandas library offers the Series.clip[1] and DataFrame.clip[2] methods. The NumPy library offers the clip[3] function. In the Wolfram Language, it is implemented as Clip[x, {minimum, maximum}].[4]
In OpenGL, the glClearColor function takes four GLfloat values which are then 'clamped' to the range .[5]
![{\displaystyle [0,1]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/738f7d23bb2d9642bab520020873cccbef49768d)
One of the many uses of clamping in computer graphics is the placing of a detail inside a polygon—for example, a bullet hole on a wall. It can also be used with wrapping to create a variety of effects.
References
[edit]- ^ "Pandas Series.clip method documentation". Retrieved 2023-10-15.
- ^ "Pandas DataFrame.clip method documentation". Retrieved 2023-10-15.
- ^ "NumPy clip function documentation". Retrieved 2023-10-15.
- ^ "Wolfram Language Clip funcion documentation". Retrieved 2023-10-15.
- ^ "OpenGL 4 Reference Pages". www.khronos.org. Retrieved 2018-10-31.
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