Created
November 25, 2022 12:08
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Mapping property values to normalized control values. Includes a gamma parameter that, for example, makes a UISlider control more less sensitive to adjustments made at the lower end of the scale
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| static const double kVideoZoomFactorPowerCoefficient = 3.333f; | |
| // | |
| // | |
| // | |
| static double (^ _Nonnull control_property_value)(double, double, double, double) = ^ double (double control_value, double property_value_min, double property_value_max, double gamma) { | |
| return ((pow(control_value, gamma) * (property_value_max - property_value_min)) + property_value_min); | |
| }; | |
| static double (^ _Nonnull property_control_value)(double, double, double, double) = ^ double (double property_value, double property_value_min, double property_value_max, double inverse_gamma) { | |
| return pow((property_value - property_value_min) / (property_value_max - property_value_min), 1.f / inverse_gamma); | |
| }; | |
| // | |
| // | |
| // | |
| self.videoZoomFactorSlider.minimumValue = 0.0; | |
| self.videoZoomFactorSlider.maximumValue = 1.0; | |
| self.videoZoomFactorSlider.value = property_control_value(self.videoDevice.videoZoomFactor, self.videoDevice.minAvailableVideoZoomFactor, self.videoDevice.activeFormat.videoMaxZoomFactor, kVideoZoomFactorPowerCoefficient); | |
| // | |
| // | |
| // | |
| [self.videoDevice setVideoZoomFactor:control_property_value(sender.value, self.videoDevice.minAvailableVideoZoomFactor, self.videoDevice.activeFormat.videoMaxZoomFactor, kVideoZoomFactorPowerCoefficient)]; | |
| // | |
| // | |
| // | |
| [self.videoZoomFactorSlider setValue:property_control_value([newValue doubleValue], self.videoDevice.minAvailableVideoZoomFactor, self.videoDevice.activeFormat.videoMaxZoomFactor, kVideoZoomFactorPowerCoefficient)]; |
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