Documentation ¶
Overview ¶
Package palette provides basic color palette handling.
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
View Source
var ( // ErrOverflow is the error returned by ColorMaps when the specified // value is greater than the maximum value. ErrOverflow = errors.New("palette: specified value > maximum") // ErrUnderflow is the error returned by ColorMaps when the specified // value is less than the minimum value. ErrUnderflow = errors.New("palette: specified value < minimum") // ErrNaN is the error returned by ColorMaps when the specified // value is NaN. ErrNaN = errors.New("palette: specified value == NaN") )
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var HSVAModel = color.ModelFunc(hsvaModel)
HSVAModel converts any color.Color to an HSVA color.
Functions ¶
This section is empty.
Types ¶
type ColorMap ¶
type ColorMap interface { // At returns the color associated with the given value. // If the value is not between Max() and Min(), an error is returned. At(float64) (color.Color, error) // Max returns the current maximum value of the ColorMap. Max() float64 // SetMax sets the maximum value of the ColorMap. SetMax(float64) // Min returns the current minimum value of the ColorMap. Min() float64 // SetMin sets the minimum value of the ColorMap. SetMin(float64) // Alpha returns the opacity value of the ColorMap. Alpha() float64 // SetAlpha sets the opacity value of the ColorMap. Zero is transparent // and one is completely opaque. The default value of alpha should be // expected to be one. The function should be expected to panic // if alpha is not between zero and one. SetAlpha(float64) // Palette creates a Palette with the specified number of colors // from the ColorMap. Palette(colors int) Palette }
A ColorMap maps scalar values to colors.
type DivergingColorMap ¶
type DivergingColorMap interface { ColorMap // SetConvergePoint sets the value where the diverging colors // should meet. The default value should be expected to be // (Min() + Max()) / 2. It should be expected that calling either // SetMax() or SetMin() will set a new default value, so for a // custom convergence point this function should be called after // SetMax() and SetMin(). The function should be expected to panic // if the value is not between Min() and Max(). SetConvergePoint(float64) // ConvergePoint returns the value where the diverging colors meet. ConvergePoint() float64 }
DivergingColorMap maps scalar values to colors that diverge from a central value.
type DivergingPalette ¶
type DivergingPalette interface { Palette // CriticalIndex returns the indices of the lightest // (median) color or colors in the DivergingPalette. // The low and high index values will be equal when // there is a single median color. CriticalIndex() (low, high int) }
DivergingPalette is a collection of colors ordered into a palette with a critical class or break in the middle of the color range.
type HSVA ¶
type HSVA struct {
H, S, V, A float64
}
HSVA represents a Hue/Saturation/Value/Alpha color. H, S, V and A are valid within [0, 1].
type Hue ¶
type Hue float64
Hue represents a hue in HSV color space. Valid Hues are within [0, 1].
func (Hue) Complement ¶
Complement returns the complementary hue of a Hue.
Directories ¶
Path | Synopsis |
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Package brewer provides Brewer Palettes for informative graphics.
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Package brewer provides Brewer Palettes for informative graphics. |
Package moreland provides color maps for pseudocoloring scalar fields.
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Package moreland provides color maps for pseudocoloring scalar fields. |
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