MultiGradient Class Reference

A gradient of multiple colors and arbitrary distances between colors. More...

#include <OpenMS/VISUAL/MultiGradient.h>

Public Types
enum	InterpolationMode { IM_LINEAR, IM_STAIRS }
	Interpolation mode. More...

Public Member Functions
	MultiGradient ()
	Constructor. More...
	MultiGradient (const MultiGradient &multigradient)
	Copy constructor. More...
	~MultiGradient ()
	Destructor. More...
MultiGradient &	operator= (const MultiGradient &rhs)
	Assignment operator. More...
void	insert (double position, QColor color)
	sets or replaces the color at position position More...
bool	remove (double position)
	removes the color at position position More...
bool	exists (double position)
	returns if a value for position position exists More...
UInt	position (UInt index)
	returns the position of the index -th point More...
QColor	color (UInt index)
	returns the color of the index -th point More...
QColor	interpolatedColorAt (double position) const
	Returns the color as position. More...
QColor	interpolatedColorAt (double position, double min, double max) const
	returns the color as position with the gradient stretched between min and max. More...
void	activatePrecalculationMode (double min, double max, UInt steps)
	activates the precalculation of values (only approximate results are given) More...
void	deactivatePrecalculationMode ()
	deactivates the precalculation of values ( and deletes the precalculated values) More...
Int	precalculatedColorIndex (double position) const
	index of color in precalculated table by position in gradient More...
QColor	precalculatedColorByIndex (Int index) const
	precalculated color by its index in the table More...
QColor	precalculatedColorAt (double position) const
	Returns a precalculated color. More...
Size	size () const
	return the number of color points More...
Size	precalculatedSize () const
	size of precalculated colors table More...
void	setInterpolationMode (InterpolationMode mode)
	sets the interpolation mode (default or stairs). Default is linear More...
InterpolationMode	getInterpolationMode () const
	returns the interpolation mode More...
std::string	toString () const
	convert to string representation More...
void	fromString (const std::string &gradient)
	Sets the gradient by string representation. More...

Static Public Member Functions
static MultiGradient	getDefaultGradientLinearIntensityMode ()
	Returns the default gradient for linear intensity mode. More...
static MultiGradient	getDefaultGradientLogarithmicIntensityMode ()
	Returns the default gradient for logarithmic intensity mode. More...

Protected Attributes
std::map< double, QColor >	pos_col_
	Map of index and color. More...
InterpolationMode	interpolation_mode_
	Current interpolation mode. More...
std::vector< QColor >	pre_
	Precalculated colors. More...
double	pre_min_
	Minimum of the precalculated color range. More...
double	pre_size_
	Width of the precalculated color range. More...
UInt	pre_steps_
	Steps of the precalculated color range. More...

Detailed Description

A gradient of multiple colors and arbitrary distances between colors.

Positions associated with numbers range from 0 to 100. There is always a color associated with position 0 and 100. Stretching the gradient to a specified range, and precalculation and caching is also possible.

Member Enumeration Documentation

InterpolationMode

enum InterpolationMode

Interpolation mode.

Enumerator
IM_LINEAR	IM_LINEAR returns the linear interpolation (default).
IM_STAIRS	IM_STAIRS returns the color of the next lower position.

Constructor & Destructor Documentation

MultiGradient() [1/2]

MultiGradient

(

)

Constructor.

MultiGradient() [2/2]

MultiGradient

(

const MultiGradient &

multigradient

)

Copy constructor.

~MultiGradient()

~MultiGradient

(

)

Destructor.

Member Function Documentation

activatePrecalculationMode()

void activatePrecalculationMode	(	double	min,
		double	max,
		UInt	steps
	)

activates the precalculation of values (only approximate results are given)

color()

QColor color

(

UInt

index

)

returns the color of the index -th point

Exceptions

Exception::IndexOverflow

is thrown for a too large index

deactivatePrecalculationMode()

void deactivatePrecalculationMode

(

)

deactivates the precalculation of values ( and deletes the precalculated values)

exists()

bool exists

(

double

position

)

returns if a value for position position exists

fromString()

void fromString

(

const std::string &

gradient

)

Sets the gradient by string representation.

The string representation of a gradient starts with the interpolation mode: "Linear" or "Stairs" and the separator "|". It is followed by an arbitrary number of integer-color-pairs.

Such a pair consists of floating point number (0.0-100.0) followed by a comma and a "#". Then follows a color in RGB notation "#RRGGBB" and finally a semicolon.

Examples are:

• "Linear|0,#ffff00;100,#000000"
• "Stairs|0,#ffff00;11.5,#ffaa00;32,#ff0000;55,#aa00ff;78,#5500ff;100,#000000"

getDefaultGradientLinearIntensityMode()

static MultiGradient getDefaultGradientLinearIntensityMode ( )

static

Returns the default gradient for linear intensity mode.

getDefaultGradientLogarithmicIntensityMode()

static MultiGradient getDefaultGradientLogarithmicIntensityMode ( )

static

Returns the default gradient for logarithmic intensity mode.

getInterpolationMode()

InterpolationMode getInterpolationMode

(

)

const

returns the interpolation mode

insert()

void insert	(	double	position,
		QColor	color
	)

sets or replaces the color at position position

interpolatedColorAt() [1/2]

QColor interpolatedColorAt

(

double

position

)

const

Returns the color as position.

If the position is higher or lower than the range [0,100] the highest, respectively the lowest, color is returned.

interpolatedColorAt() [2/2]

QColor interpolatedColorAt	(	double	position,
		double	min,
		double	max
	)		const

returns the color as position with the gradient stretched between min and max.

If the position is higher or lower than the range [min,max] the highest, respectively the lowest, color is returned.

operator=()

MultiGradient& operator=

(

const MultiGradient &

rhs

)

Assignment operator.

position()

UInt position

(

UInt

index

)

returns the position of the index -th point

Exceptions

Exception::IndexOverflow

is thrown for a too large index

precalculatedColorAt()

QColor precalculatedColorAt ( double  position ) const

inline

Returns a precalculated color.

If the position is out of the range specified in activatePrecalculationMode() the behaviour depends on the debug mode:

• With debug information an Precondition exception is thrown
• Without debug information array boundaries are violated, which probably causes a segmentation fault.

precalculatedColorByIndex()

QColor precalculatedColorByIndex ( Int  index ) const

inline

precalculated color by its index in the table

References OPENMS_PRECONDITION.

Referenced by Spectrum2DCanvas::heightColor_().

precalculatedColorIndex()

Int precalculatedColorIndex ( double  position ) const

inline

index of color in precalculated table by position in gradient

References OPENMS_PRECONDITION.

Referenced by Spectrum2DCanvas::precalculatedColorIndex_().

precalculatedSize()

Size precalculatedSize ( ) const

inline

size of precalculated colors table

References OpenMS::StringConversions::toString().

remove()

bool remove

(

double

position

)

removes the color at position position

setInterpolationMode()

void setInterpolationMode

(

InterpolationMode

mode

)

sets the interpolation mode (default or stairs). Default is linear

size()

Size size

(

)

const

return the number of color points

toString()

std::string toString

(

)

const

convert to string representation

Member Data Documentation

interpolation_mode_

InterpolationMode interpolation_mode_

protected

Current interpolation mode.

pos_col_

std::map<double, QColor> pos_col_

protected

Map of index and color.

pre_

std::vector<QColor> pre_

protected

Precalculated colors.

pre_min_

double pre_min_

protected

Minimum of the precalculated color range.

pre_size_

double pre_size_

protected

Width of the precalculated color range.

pre_steps_

UInt pre_steps_

protected

Steps of the precalculated color range.