Programming Reference:RectangularShape Class

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Location

src/shared/gui/Shapes

Synopsis

The RectangularShape class represents a rectangle drawn onto a GraphDisplay. Typically, it is used to represent a 2D feedback cursor or target.

Methods

Show()

Makes the object visible. Initially, objects are created in visible state.

Hide()

Makes the object invisible.

Invalidate()

Invalidates the object's bounding rectangle, i.e. marks it as needing to be repainted. Typically, this function is called from a derived class, indicating that a change in object properties has occurred that requires a repaint.

Paint()

Asks an object to paint itself by calling its OnPaint event handler.

Change()

Notifies an object of a change in display properties by calling its OnChange event handler.

bool Click(GUI::Point)

Tests whether the specified point is inside an object's bounding rectangle, and calls its OnClick event handler if this is the case.

Properties

GUI::Point Center

The shape's center of mass, i.e. what would be considered its "position". For simple shapes, this coincides with the center of the shape's bounding rectangle.

float LineWidth

The shape border's line width, in pixels.

RGBColor FillColor

The shape's filling color.

RGBColor Color

The color of the shape's border.

GraphDisplay Display (r)

The GraphDisplay object that was specified when the object was created.

bool Visible (r)

True if the object is visible, false if it is hidden. Use the Hide() and Show() methods to set this property.

float ZOrder (rw)

Determines the order in which GraphObjects are drawn. GraphObjects with smaller values of ZOrder are drawn on top of those with larger values, hiding these.

enum AspectRatioMode (rw)

One of the following options:

AdjustNone
No adjustment is made.
AdjustWidth
The object's width is adapted to its contents, while keeping its height constant.
AdjustHeight
The object's height is adapted to its contents, keeping its width constant.
AdjustBoth
Both the object's height and width are adjusted to its content.

The exact behavior of aspect ratio adjustment depends on the object's type. E.g., for bitmap images, AdjustBoth will size the image such that one image pixel corresponds to one screen pixel; AdjustHeight and AdjustWidth will adjust such that the original aspect ratio is preserved.

GUI::Rect DisplayRect (rw)

The bounding rectangle of the space that is occupied by the object. This is given in coordinates relative to the size of the object's GraphDisplay; there, the upper left corner corresponds to (0,0), the lower right corner to (1,1). When a GraphObject is created, its display rectangle is empty.

See also

Programming Reference:Shape Class, Programming Reference:GraphObject Class, Programming Reference:GraphDisplay Class