7b86958b25
Don't return RGB values if colour is not solid and hence cannot be represented with these values. Non-solid colour should be reported as an unknown RGB value, e.g. '??????'. Closes #18596.
349 lines
10 KiB
Objective-C
349 lines
10 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: colour.h
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// Purpose: interface of wxColour
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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Flags for wxColour -> wxString conversion (see wxColour::GetAsString).
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@{
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*/
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enum {
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wxC2S_NAME = 1, // return colour name, when possible
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wxC2S_CSS_SYNTAX = 2, // return colour in rgb(r,g,b) syntax
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wxC2S_HTML_SYNTAX = 4 // return colour in #rrggbb syntax
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};
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//@}
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const unsigned char wxALPHA_TRANSPARENT = 0;
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const unsigned char wxALPHA_OPAQUE = 0xff;
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/**
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@class wxColour
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A colour is an object representing a combination of Red, Green, and Blue
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(RGB) intensity values and an Alpha value, and is used to determine
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drawing colours. See the entry for wxColourDatabase for how a pointer to a predefined,
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named colour may be returned instead of creating a new colour.
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Valid RGB values are in the range 0 to 255.
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You can retrieve the current system colour settings with wxSystemSettings.
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@library{wxcore}
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@category{gdi}
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@stdobjects
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- ::wxNullColour - An empty, invalid colour.
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- ::wxTransparentColour - Valid but fully transparent colour (new in 2.9.1).
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- ::wxBLACK
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- ::wxBLUE
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- ::wxCYAN
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- ::wxGREEN
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- ::wxYELLOW
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- ::wxLIGHT_GREY
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- ::wxRED
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- ::wxWHITE
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@see wxColourDatabase, wxPen, wxBrush, wxColourDialog, wxSystemSettings
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*/
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class wxColour : public wxObject
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{
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public:
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/**
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Default constructor.
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*/
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wxColour();
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/**
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@param red
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The red value.
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@param green
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The green value.
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@param blue
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The blue value.
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@param alpha
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The alpha value. Alpha values range from 0 (wxALPHA_TRANSPARENT) to
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255 (wxALPHA_OPAQUE).
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*/
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wxColour(unsigned char red, unsigned char green, unsigned char blue,
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unsigned char alpha = wxALPHA_OPAQUE);
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/**
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@param colourName
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The colour name.
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*/
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wxColour(const wxString& colourName);
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/**
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@param colRGB
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A packed RGB value.
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*/
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wxColour(unsigned long colRGB);
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/**
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Copy constructor.
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*/
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wxColour(const wxColour& colour);
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/**
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Returns the alpha value, on platforms where alpha is not yet supported, this
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always returns wxALPHA_OPAQUE.
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*/
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virtual unsigned char Alpha() const;
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/**
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Returns the blue intensity.
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*/
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virtual unsigned char Blue() const;
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/**
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Converts this colour to a wxString using the given flags.
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The supported flags are @c wxC2S_NAME, to obtain the colour name
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(e.g. wxColour(255,0,0) == "red"), @c wxC2S_CSS_SYNTAX, to obtain
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the colour in the "rgb(r,g,b)" or "rgba(r,g,b,a)" syntax
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(e.g. wxColour(255,0,0,85) == "rgba(255,0,0,0.333)"), and
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@c wxC2S_HTML_SYNTAX, to obtain the colour as "#" followed by 6
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hexadecimal digits (e.g. wxColour(255,0,0) == "#FF0000").
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This function never fails and always returns a non-empty string but
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asserts if the colour has alpha channel (i.e. is non opaque) but
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@c wxC2S_CSS_SYNTAX (which is the only one supporting alpha) is not
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specified in flags.
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@note For non-solid (i.e. non-RGB) colour this function returns
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"rgb(??, ?? ??)" or "#??????".
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@since 2.7.0
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*/
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virtual wxString GetAsString(long flags = wxC2S_NAME | wxC2S_CSS_SYNTAX) const;
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//@{
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/**
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Sets the RGB or RGBA colour values from a single 32 bit value.
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The arguments @a colRGB and @a colRGBA should be of the form 0x00BBGGRR
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and 0xAABBGGRR respectively where @c 0xRR, @c 0xGG, @c 0xBB and @c 0xAA
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are the values of the red, green, blue and alpha components.
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Notice the right-to-left order of components!
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@see GetRGB(), GetRGBA()
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@since 2.9.1
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*/
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void SetRGB(wxUint32 colRGB);
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void SetRGBA(wxUint32 colRGBA);
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//@}
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//@{
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/**
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Gets the RGB or RGBA colour values as a single 32 bit value.
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The returned value is of the same form as expected by SetRGB() and
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SetRGBA().
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Notice that GetRGB() returns the value with 0 as its highest byte
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independently of the value actually returned by Alpha(). So for a fully
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opaque colour, the return value of GetRGBA() is @c 0xFFBBGGRR while
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that of GetRGB() is @c 0x00BBGGRR.
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@since 2.9.1
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*/
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wxUint32 GetRGB() const;
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wxUint32 GetRGBA() const;
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//@}
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/**
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Return the perceived brightness of the colour.
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This value is computed using the simple @code 0.299*R + 0.587*G + 0.114*B @endcode
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formula with the coefficients taken from the RGB to
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YIQ conversion formula and @c R, @c G and @c B being the values of the
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corresponding colour channels normalized to 0..1 range, so that the
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return value is 0 for black and 1 for white.
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@since 3.1.3
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*/
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double GetLuminance() const;
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/**
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Returns a pixel value which is platform-dependent.
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On Windows, a COLORREF is returned.
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On X, an allocated pixel value is returned.
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If the pixel is invalid (on X, unallocated), @c -1 is returned.
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*/
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wxIntPtr GetPixel() const;
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/**
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Returns the green intensity.
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*/
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virtual unsigned char Green() const;
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/**
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Returns @true if the colour object is valid (the colour has been initialised
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with RGB values).
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*/
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virtual bool IsOk() const;
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/**
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Returns the red intensity.
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*/
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virtual unsigned char Red() const;
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/**
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Returns @true if the color can be described using RGB values, i.e. is solid,
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@false if it is a pattern (currently only possible on macOS)
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*/
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virtual bool IsSolid() const;
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//@{
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/**
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Sets the RGB intensity values using the given values (first overload),
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extracting them from the packed long (second overload), using the given
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string (third overload).
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When using third form, Set() accepts: colour names (those listed in
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wxColourDatabase), the CSS-like @c "rgb(r,g,b)" or @c "rgba(r,g,b,a)" syntax
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(case insensitive) and the HTML-like syntax: @c "#" followed by 6 hexadecimal
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digits for red, green, blue components.
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Returns @true if the conversion was successful, @false otherwise.
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@since 2.7.0
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*/
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void Set(unsigned char red, unsigned char green,
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unsigned char blue,
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unsigned char alpha = wxALPHA_OPAQUE);
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void Set(unsigned long RGB);
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bool Set(const wxString& str);
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//@}
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/**
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Tests the inequality of two colours by comparing individual red, green, blue
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intensities and alpha values.
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*/
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bool operator !=(const wxColour& colour) const;
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/**
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Assignment operator.
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@see wxColourDatabase
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*/
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wxColour& operator=(const wxColour& colour);
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/**
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Tests the equality of two colours by comparing individual red, green, blue
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intensities and alpha values.
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*/
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bool operator ==(const wxColour& colour) const;
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/**
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Assigns the same value to @a r, @a g, @a b: 0 if @a on is @c false, 255 otherwise.
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@since 2.9.0
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*/
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static void MakeMono(unsigned char* r, unsigned char* g, unsigned char* b, bool on);
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/**
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Create a disabled (dimmed) colour from (in/out) rgb parameters.
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@since 2.9.0
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*/
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static void MakeDisabled(unsigned char* r, unsigned char* g, unsigned char* b, unsigned char brightness = 255);
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/**
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Make a disabled version of this colour.
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This method modifies the object in place and returns the object itself.
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@since 2.9.5
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*/
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wxColour& MakeDisabled(unsigned char brightness = 255);
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/**
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Create a grey colour from (in/out) rgb parameters using integer arithmetic.
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@since 2.9.0
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*/
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static void MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b);
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/**
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Create a grey colour from (in/out) rgb parameters using floating point arithmetic.
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Defaults to using the standard ITU-T BT.601 when converting to YUV, where every pixel equals
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(R * @a weight_r) + (G * @a weight_g) + (B * @a weight_b).
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@since 2.9.0
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*/
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static void MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b,
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double weight_r, double weight_g, double weight_b);
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/**
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Blend colour, taking alpha into account.
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@since 2.9.0
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*/
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static unsigned char AlphaBlend(unsigned char fg, unsigned char bg, double alpha);
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/**
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Utility function that simply darkens or lightens a color, based on the specified
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percentage @a ialpha. @a ialpha of 0 would be make the color completely black,
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200 completely white and 100 would not change the color.
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@since 2.9.0
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*/
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static void ChangeLightness(unsigned char* r, unsigned char* g, unsigned char* b, int ialpha);
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/**
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wxColour wrapper for ChangeLightness(r,g,b,ialpha).
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@since 2.9.0
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*/
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wxColour ChangeLightness(int ialpha) const;
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};
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/** @name Predefined colors. */
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//@{
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wxColour wxNullColour;
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wxColour wxTransparentColour;
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wxColour* wxBLACK;
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wxColour* wxBLUE;
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wxColour* wxCYAN;
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wxColour* wxGREEN;
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wxColour* wxYELLOW;
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wxColour* wxLIGHT_GREY;
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wxColour* wxRED;
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wxColour* wxWHITE;
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//@}
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// ============================================================================
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// Global functions/macros
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// ============================================================================
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/** @addtogroup group_funcmacro_misc */
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//@{
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/**
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Converts string to a wxColour best represented by the given string. Returns
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@true on success.
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@see wxToString(const wxColour&)
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@header{wx/colour.h}
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*/
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bool wxFromString(const wxString& string, wxColour* colour);
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/**
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Converts the given wxColour into a string.
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@see wxFromString(const wxString&, wxColour*)
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@header{wx/colour.h}
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*/
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wxString wxToString(const wxColour& colour);
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//@}
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