内容

• 公共函数
• 重实现公共函数
• 重实现保护函数
• 详细描述

Q3CanvasPolygon Class

The Q3CanvasPolygon class provides a polygon on a Q3Canvas . 更多...

头：	#include <Q3CanvasPolygon>
继承：	Q3CanvasPolygonalItem
继承者：	Q3CanvasSpline

• 所有成员列表，包括继承成员

公共函数

	Q3CanvasPolygon (Q3Canvas * canvas )
	~Q3CanvasPolygon ()
Q3PointArray	points () const
void	setPoints (Q3PointArray pa )

重实现公共函数

virtual Q3PointArray	areaPoints () const
virtual void	moveBy (double dx , double dy )
virtual int	rtti () const

• 9 公共函数继承自 Q3CanvasPolygonalItem
• 34 公共函数继承自 Q3CanvasItem

重实现保护函数

virtual void

drawShape (QPainter & p )

• 6 保护函数继承自 Q3CanvasPolygonalItem
• 1 保护函数继承自 Q3CanvasItem

详细描述

The Q3CanvasPolygon class provides a polygon on a Q3Canvas .

Paints a polygon with a QBrush . The polygon's points can be set in the constructor or set or changed later using setPoints ()。使用 points () to retrieve the points, or areaPoints () to retrieve the points relative to the canvas's origin.

The polygon can be drawn on a painter with drawShape ().

Like any other canvas item polygons can be moved with Q3CanvasItem::move () 和 Q3CanvasItem::moveBy (), or by setting coordinates with Q3CanvasItem::setX (), Q3CanvasItem::setY () 和 Q3CanvasItem::setZ ().

注意： Q3CanvasPolygon does not use the pen.

另请参阅 QtCanvas and Porting to Graphics View .

成员函数文档编制

Q3CanvasPolygon:: Q3CanvasPolygon ( Q3Canvas * canvas )

Constructs a point-less polygon on the canvas canvas . You should call setPoints () before using it further.

Q3CanvasPolygon:: ~Q3CanvasPolygon ()

Destroys the polygon.

[虚拟] Q3PointArray Q3CanvasPolygon:: areaPoints () const

重实现自 Q3CanvasPolygonalItem::areaPoints ().

Returns the vertices of the polygon translated by the polygon's current x (), y () position, i.e. relative to the canvas's origin.

另请参阅 setPoints () 和 points ().

[virtual protected] void Q3CanvasPolygon:: drawShape ( QPainter & p )

重实现自 Q3CanvasPolygonalItem::drawShape ().

Draws the polygon using the painter p .

注意， Q3CanvasPolygon does not support an outline (the pen is always NoPen).

[虚拟] void Q3CanvasPolygon:: moveBy ( double dx , double dy )

重实现自 Q3CanvasItem::moveBy ().

Q3PointArray Q3CanvasPolygon:: points () const

Returns the vertices of the polygon, not translated by the position.

另请参阅 setPoints () 和 areaPoints ().

[虚拟] int Q3CanvasPolygon:: rtti () const

重实现自 Q3CanvasItem::rtti ().

Returns 4 ( Q3CanvasItem::Rtti_Polygon ).

另请参阅 Q3CanvasItem::rtti ().

void Q3CanvasPolygon:: setPoints ( Q3PointArray pa )

Sets the points of the polygon to be pa . These points will have their x and y coordinates automatically translated by x (), y () as the polygon is moved.

另请参阅 points ().