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Slint 1.9.0

Path

The Path element allows rendering a generic shape, composed of different geometric commands. A path shape can be filled and outlined.

When not part of a layout, its width or height defaults to 100% of the parent element when not specified.

A path can be defined in two different ways:

  • Using SVG path commands as a string
  • Using path command elements in .slint markup.

The coordinates used in the geometric commands are within the imaginary coordinate system of the path. When rendering on the screen, the shape is drawn relative to the x and y properties. If the width and height properties are non-zero, then the entire shape is fit into these bounds - by scaling accordingly.

fill

brush default: a transparent brush

The color for filling the shape of the path.

fill-rule

enum FillRule default: nonzero

FillRule

This enum describes the different ways of deciding what the inside of a shape described by a path shall be.

The fill rule to use for the path.

stroke

brush default: a transparent brush

The color for drawing the outline of the path.

stroke-width

length default: 0px

The width of the outline.

width

length default: 0px

If non-zero, the path will be scaled to fit into the specified width.

height

length default: 0px

If non-zero, the path will be scaled to fit into the specified height.

Viewbox properties

viewbox-x

float default: 0.0

viewbox-y

float default: 0.0

viewbox-width

float default: 0.0

viewbox-height

float default: 0.0

These four properties allow defining the position and size of the viewport of the path in path coordinates.

If the viewbox-width or viewbox-height is less or equal than zero, the viewbox properties are ignored and instead the bounding rectangle of all path elements is used to define the view port.

clip

bool default: false

By default, when a path has a view box defined and the elements render outside of it, they are still rendered. When this property is set to true, then rendering will be clipped at the boundaries of the view box.

Path Using SVG commands

SVG is a popular file format for defining scalable graphics, which are often composed of paths. In SVG paths are composed using commands ↗, which in turn are written in a string. In .slint the path commands are provided to the commands property. The following example renders a shape consists of an arc and a rectangle, composed of line-to, move-to and arc commands:

export component Example inherits Path {
    width: 100px;
    height: 100px;
    commands: "M 0 0 L 0 100 A 1 1 0 0 0 100 100 L 100 0 Z";
    stroke: red;
    stroke-width: 1px;
}

The commands are provided in a property:

commands

string default: ""

A string providing the commands according to the SVG path specification. This property can only be set in a binding and cannot be accessed in an expression.

Path Using SVG Path Elements

The shape of the path can also be described using elements that resemble the SVG path commands but use the .slint markup syntax. The earlier example using SVG commands can also be written like that:

export component Example inherits Path {
    width: 100px;
    height: 100px;
    stroke: blue;
    stroke-width: 1px;


    MoveTo {
        x: 0;
        y: 0;
    }
    LineTo {
        x: 0;
        y: 100;
    }
    ArcTo {
        radius-x: 1;
        radius-y: 1;
        x: 100;
        y: 100;
    }
    LineTo {
        x: 100;
        y: 0;
    }
    Close {
    }
}

Note how the coordinates of the path elements don’t use units - they operate within the imaginary coordinate system of the scalable path.

MoveTo Sub-element for Path

The MoveTo sub-element closes the current sub-path, if present, and moves the current point to the location specified by the x and y properties. Subsequent elements such as LineTo will use this new position as their starting point, therefore this starts a new sub-path.

x

float default: 0.0

The x position of the new current point.

y

float default: 0.0

The y position of the new current point.

LineTo Sub-element for Path

The LineTo sub-element describes a line from the path’s current position to the location specified by the x and y properties.

x

float default: 0.0

The target x position of the line.

y

float default: 0.0

The target y position of the line.

ArcTo Sub-element for Path

The ArcTo sub-element describes the portion of an ellipse. The arc is drawn from the path’s current position to the location specified by the x and y properties. The remaining properties are modelled after the SVG specification and allow tuning visual features such as the direction or angle.

large-arc

bool default: false

Out of the two arcs of a closed ellipse, this flag selects that the larger arc is to be rendered. If the property is false, the shorter arc is rendered instead.

radius-x

float default: 0.0

The x-radius of the ellipse.

radius-y

float default: 0.0

The y-radius of the ellipse.

sweep

bool default: false

If the property is true, the arc will be drawn as a clockwise turning arc; anti-clockwise otherwise.

x-rotation

float default: 0.0

The x-axis of the ellipse will be rotated by the value of this properties, specified in as angle in degrees from 0 to 360.

x

float default: 0.0

The target x position of the line.

y

float default: 0.0

The target y position of the line.

CubicTo Sub-element for Path

The CubicTo sub-element describes a smooth Bézier from the path’s current position to the location specified by the x and y properties, using two control points specified by their respective properties.

control-1-x

float default: 0.0

The x coordinate of the curve’s first control point.

control-1-y

float default: 0.0

The y coordinate of the curve’s first control point.

control-2-x

float default: 0.0

The x coordinate of the curve’s second control point.

control-2-y

float default: 0.0

The y coordinate of the curve’s second control point.

x

float default: 0.0

The target x position of the curve.

y

float default: 0.0

The target y position of the curve.

QuadraticTo Sub-element for Path

The QuadraticTo sub-element describes a smooth Bézier from the path’s current position to the location specified by the x and y properties, using the control points specified by the control-x and control-y properties.

control-x

float default: 0.0

The x coordinate of the curve’s control point.

control-y

float default: 0.0

The y coordinate of the curve’s control point.

x

float default: 0.0

The target x position of the curve.

y

float default: 0.0

The target y position of the curve.

Close Sub-element for Path

The Close element closes the current sub-path and draws a straight line from the current position to the beginning of the path.