內容

• 公共函數
• 重實現公共函數
• 重實現保護函數
• 詳細描述

Q3CanvasPolygon Class

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

頭：	#include <Q3CanvasPolygon>
繼承：	Q3CanvasPolygonalItem
繼承者：	Q3CanvasSpline

• 所有成員列錶，包括繼承成員

公共函數

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

重實現公共函數

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

• 9 公共函數繼承自 Q3CanvasPolygonalItem
• 34 公共函數繼承自 Q3CanvasItem

重實現保護函數

virtual void

drawShape (QPainter & p )

• 6 保護函數繼承自 Q3CanvasPolygonalItem
• 1 保護函數繼承自 Q3CanvasItem

詳細描述

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.

另請參閱 QtCanvas and Porting to Graphics View .

成員函數文檔編製

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.

[虛擬] Q3PointArray Q3CanvasPolygon:: areaPoints () const

重實現自 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.

另請參閱 setPoints () 和 points ().

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

重實現自 Q3CanvasPolygonalItem::drawShape ().

Draws the polygon using the painter p .

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

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

重實現自 Q3CanvasItem::moveBy ().

Q3PointArray Q3CanvasPolygon:: points () const

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

另請參閱 setPoints () 和 areaPoints ().

[虛擬] int Q3CanvasPolygon:: rtti () const

重實現自 Q3CanvasItem::rtti ().

Returns 4 ( Q3CanvasItem::Rtti_Polygon ).

另請參閱 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.

另請參閱 points ().