Qwt3DDrawable Class Reference

Abstract base class for Drawables. More...

#include <qwt3d_drawable.h>

Inheritance diagram for Qwt3DDrawable:

Classes
class	PrivateData

Public Member Functions
virtual void	draw (const Qwt3DRenderContext &ctx)
void	attach (Qwt3DDrawable *)
void	detach (Qwt3DDrawable *)
void	detachAll ()
virtual void	setColor (double r, double g, double b, double a=1)
virtual void	setColor (RGBA rgba)
RGBA	color () const
	Returns the drawable's color.

Protected Member Functions
	Qwt3DDrawable (Qwt3DDrawable &&other) noexcept
Qwt3DDrawable &	operator= (Qwt3DDrawable &&other) noexcept

Protected Attributes
RGBA	m_color

Detailed Description

Abstract base class for Drawables.

Drawables are scene-graph nodes rendered during paintGL. They no longer manage legacy GL state. Each drawable receives its rendering resources (shaders, matrices, viewport, coordinate conversion) through a Qwt3DRenderContext passed to draw(), eliminating the former Qwt3DPlot* back-pointer (deferred smell #1, resolved).

Member Function Documentation

color()

RGBA Qwt3DDrawable::color

(

)

const

Returns the drawable's color.

返回 drawable 的颜色

Returns

RGBA 颜色值

返回 protected 成员 m_color。添加此公有 getter 是为了让兄弟类 （如 Qwt3DAxis 访问 Qwt3DLabel 的 color）能跨对象读取颜色值， 而无需直接访问 protected 成员。C++ 规则下，派生类只能通过 this 访问自身基类的 protected 成员，不能通过另一个兄弟类对象访问。

draw()

void Qwt3DDrawable::draw ( const Qwt3DRenderContext &  ctx )

virtual

Reimplemented in Qwt3DAxis, Qwt3DColorLegend, Qwt3DCoordinateSystem, and Qwt3DLabel.

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

• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_drawable.h
• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_drawable.cpp