ColorCircle Class Reference

#include <colorcircle.h>

List of all members.

Signals
void	colorChanged (const rColor &)
Public Member Functions
	ColorCircle (QWidget *parent=0, const char *name=0, WFlags f=0)
	~ColorCircle ()
void	setColor (const rColor &)
Protected Member Functions
void	drawContents (QPainter *)
void	mouseReleaseEvent (QMouseEvent *)
Private Member Functions
void	makeCircle ()
void	makeTriangle (int)
double	arcTan (double, double)
void	calcVertices (int, int *, int *, int *, int *, int *, int *)
bool	isInTriangle (int, int)
void	calcSV (int, int, int *, int *)
void	calcCoords (int *, int *)
Private Attributes
QWMatrix	wm
QSize	palSize
QSize	frameSize
QPixmap	cpm
QPixmap	tpm
QPixmap	bg
double	innerRadius
double	outerRadius
double	center
int	icenter
int	irad
int	orad
int	currentHue
int	currentSat
int	currentVal
int	currentAlpha
double	circleWidth

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Detailed Description

The basic selection of a color is achieved through the chromatic color circle. Clicking at a random position will turn the color triangle to point to the chosen hue, showing the possible shades of that hue. Clicking inside the triangle will select the corresponding saturation und value. Code for the painting of the triangle and some helper functions and macros are adopted from gtk+2.0 - 2.6.4 sources. Similar code should exist for Qt, but that lives in the ( non free ) Qt-Solutions download area at Trolltech.

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Constructor & Destructor Documentation

ColorCircle::ColorCircle (  QWidget *  parent = 0, const char *  name = 0, WFlags  f = 0 )

The c'tor sets up the geometry for a fixed size of 160 pixels square. It sets up a default color with hue = 0, saturation = 255, and value = 255; Todo: It should - and could easily - be made resizable. Here is the call graph for this function:

ColorCircle::~ColorCircle (   )

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Member Function Documentation

double ColorCircle::arcTan (  double  x, double  y )  [private]

Returns the arcus tangent for x, y in the range of 0 <= retVal < 2π. Is not much used though, as it turns out.

void ColorCircle::calcCoords (  int *  x, int *  y )  [private]

Calculate adequate coordinates for the currently seleced color. Sometimes the results are a bit unexpected, as can be seen when selecting a color in the triangle. This is later displayed - a circle is shown - using this function. Here is the call graph for this function:

void ColorCircle::calcSV (  int  ix, int  iy, int *  is, int *  iv )  [private]

Calculate values for Saturation and Value based on coords in the triangle. Adopted from gtk. Here is the call graph for this function:

void ColorCircle::calcVertices (  int  hue, int *  hx, int *  hy, int *  sx, int *  sy, int *  vx, int *  vy )  [private]

Calculates the vertices of the triangle for a given hue.

void ColorCircle::colorChanged (  const rColor &   )  [signal]

void ColorCircle::drawContents (  QPainter *  p  )  [protected]

Reimplemented to draw the two small circles whenever the widget needs updating. The triangle and the circle are already defined as background image. Here is the call graph for this function:

bool ColorCircle::isInTriangle (  int  x, int  y )  [private]

Check if a given coord can be found inside the triangle. Here is the call graph for this function:

void ColorCircle::makeCircle (   )  [private]

Creates the chromatic circle on a grey background. The circle is rotated so that the color red ( hue = 0 ) is at the top. Here is the call graph for this function:

void ColorCircle::makeTriangle (  int  hue  )  [private]

Draw the triangle with the correct shadings for the current hue. This code was adopted from gtk and adapted to fit in the general philosphy of the color dialog. Here is the call graph for this function:

void ColorCircle::mouseReleaseEvent (  QMouseEvent *  e  )  [protected]

We check the mouseReleaseEvent, assuming something has been clicked. If the event took place in the circle, we adjust the current hue. In the triangle we adjust Saturation and Value. Here is the call graph for this function:

void ColorCircle::setColor (  const rColor &  col  )

Sets the currently displayed rColor to col. Here is the call graph for this function:

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Member Data Documentation

QPixmap ColorCircle::bg [private]

double ColorCircle::center [private]

double ColorCircle::circleWidth [private]

QPixmap ColorCircle::cpm [private]

int ColorCircle::currentAlpha [private]

int ColorCircle::currentHue [private]

int ColorCircle::currentSat [private]

int ColorCircle::currentVal [private]

QSize ColorCircle::frameSize [private]

int ColorCircle::icenter [private]

double ColorCircle::innerRadius [private]

int ColorCircle::irad [private]

int ColorCircle::orad [private]

double ColorCircle::outerRadius [private]

QSize ColorCircle::palSize [private]

QPixmap ColorCircle::tpm [private]

QWMatrix ColorCircle::wm [private]

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The documentation for this class was generated from the following files:

• colorcircle.h
• colorcircle.cpp

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