QColorfromHsv

QColorfromHsv refers to the static factory method in the Qt framework's QColor class that creates a QColor instance from HSV components (hue, saturation, value). It provides a direct way to specify colors in the HSV color model for use in user interfaces and rendering.

There are two common forms of the method. The integer variant is QColor::fromHsv(int h, int s, int v, int a = 255), where h is the hue in degrees (0-359), s is the saturation (0-255), v is the value (0-255), and a is the alpha channel (0-255). The floating-point variant is QColor::fromHsvF(qreal h, qreal s, qreal v, qreal a = 1.0), where h, s, v, and a are in the normalized range [0, 1]. In fromHsvF, h=0 corresponds to 0 degrees and h=1 corresponds to 360 degrees.

Ranges and behavior: The inputs are interpreted according to the respective variant’s ranges. When using the integer form, values outside the valid range are clamped to the nearest valid value (h to 0-359, s, v, a to 0-255). When using the floating form, values outside [0, 1] are similarly constrained. The resulting color is represented in the RGB color space used by Qt for rendering.

Example usage: QColor c = QColor::fromHsv(180, 255, 255); creates a bright cyan color. For floating variant: QColor cf = QColor::fromHsvF(0.5, 1.0, 1.0); which also yields cyan.

See also: QColor::fromRgb, QColor::fromHsl, and methods to convert between color spaces within QColor.