ImageGear for C and C++ on Windows v19.0
IG_FX_directional_light
| API Reference Guide > Core Component API Reference > Core Component Functions Reference > FX Functions > IG_FX_directional_light |
This function changes the colors of an image according to the pattern of a sine wave.
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AT_ERRCOUNT ACCUAPI IG_FX_directional_light(
HIGEAR hIGear,
AT_FLOAT angle,
AT_INT channelCount,
AT_FLOAT amplitude[],
AT_FLOAT frequency,
AT_FLOAT phase,
AT_FLOAT attenuation
);
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| Name | Type | Description |
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| hIGear | HIGEAR | Image to which to apply direct light effect. |
| angle | AT_FLOAT | Direction to apply the effect across the image. The value is specified as an angle in degrees and ranges from 0 to 360. |
| channelCount | AT_INT | Specifies the number of channels that should be affected by the transform. |
| amplitude | AT_FLOAT[ ] | Controls the magnitude of color adjustment for each channel of the image. The number of elements of the array is typically set to the number of channels in the image. Each value should range from 0 to 2, although higher values are possible. 0 represents no change in the image color. Higher values represent more intense change. Color changes are clipped, so higher values result in a harder edge to the waveform. Array length must be equal to channelCount. |
| frequency | AT_FLOAT | Frequency of sine wave. The value should be from 0 to 0.5. The higher the frequency, the more bars will be visible. |
| phase | AT_FLOAT | Phase of sine wave. The value should be from 0 to 2*PI (approximately 6.28). As the phase is changed, the alignment of the bars is changed. This can be used to line up the bars with image content or boundaries. |
| attenuation | AT_FLOAT | Attenuation of sine wave. The value should be from -0.01 to 0.01. Attenuation adjusts how much the amplitude of the sine wave is decreased or increased as the sine wave proceeds. It can be used to cause the lighting to fade or intensify. |
Returns the number of ImageGear errors that occurred during this function call.
All pixel formats supported by ImageGear for C and C++, except:
Indexed RGB – 1 bpp;
Indexed RGB with non-grayscale palette;
Grayscale – 1 bpp.
Image Processing
The image will appear to have regularly spaced bars of light and shadow overlaid on top of it.