docs › shapes › api reference › arc reference

arc reference

A stroked arc line. Sweeps from StartAngle to EndAngle at a fixed Radius.

example

var sweep = new Arc
{
    Width = 120, Height = 120,
    StartAngle = -60, EndAngle = 60,
    Radius = 0.85f, StrokeWidth = 0.06f,
    BackgroundColor = Color.White,
};

structural properties

property type notes
StartAngle float Angle where the arc begins, in degrees.
EndAngle float Angle where the arc ends, in degrees.
Radius float Radius of the arc, as a fraction (0 to 1) of the frame box.
StrokeWidth float Thickness of the arc stroke.
RectHitTest bool When true, mouse events hit the full bounding box instead of the drawn outline. For editor-style selection and dragging; visuals are unchanged.

layout

property type notes
AlignSelf Align? Overrides the parent's AlignItems for this one child.
FlexBasis Length? Initial main-axis size of a flex child before grow and shrink are applied.
FlexGrow float? Share of leftover main-axis space this child claims; 0 (default) means do not grow.
FlexShrink float? How readily this child shrinks when space is tight; 0 pins it to its basis.
Position PositionMode? Positioning scheme: Relative offsets from the normal slot, Absolute lifts the box out of flow against the nearest positioned ancestor.
ZIndex int? Stacking order among overlapping siblings; higher draws on top.

position offsets

property type notes
Bottom Length? Bottom-edge offset; applied only when Position is Relative or Absolute.
Left Length? Left-edge offset; applied only when Position is Relative or Absolute.
Right Length? Right-edge offset; applied only when Position is Relative or Absolute.
Top Length? Top-edge offset; applied only when Position is Relative or Absolute.

sizing

property type notes
Width Length? Width of the box (Length: px, %, em, rem, ...).
Height Length? Height of the box.
MaxHeight Length? Upper bound on height.
MaxWidth Length? Upper bound on width; the box never grows past it.
MinHeight Length? Lower bound on height.
MinWidth Length? Lower bound on width; the box never shrinks below it.

spacing

property type notes
Margin Length? Outer space on all four edges, between this box and its neighbors.
MarginLeft Length? Outer space on the left edge.
MarginTop Length? Outer space on the top edge.
MarginRight Length? Outer space on the right edge.
MarginBottom Length? Outer space on the bottom edge.

background

property type notes
BackgroundColor Color? Fill color behind the content.
BackgroundTint Color? Multiplies the background image color; default white (no tint).

effects

property type notes
Opacity float? Overall opacity from 0 (transparent) to 1 (opaque).

transform

property type notes
Transform Goo.PanelTransform? Translate, rotate, scale, and skew applied to the rendered box.

misc

property type notes
PointerEvents PointerEvents? Whether the element receives pointer input (All or None).

state variants

property type notes
HoverBackgroundColor Color? BackgroundColor while the pointer is over the element.
TransitionMs int? Duration in milliseconds for the Hover/Active/Focus color transitions.

events and key

property type notes
OnClick Action? Called when clicked with the left mouse button.
OnRightClick Action? Called when clicked with the right mouse button.
OnMiddleClick Action? Called when clicked with the middle mouse button.
OnMouseEnter Action? Called when the pointer enters.
OnMouseLeave Action? Called when the pointer leaves.
OnMouseDown Action? Called when a mouse button is pressed.
OnMouseUp Action? Called when a mouse button is released.
OnMouseMove Action? Called when the pointer moves over it.
Key string? Stable identity across rebuilds. Set it when this blob can change position among its siblings, so the reconciler matches it to the same panel.

see also