Primitive shapes and text

Functions to create primitive graphics (shapes and text). Unless specified otherwise, the initial pinning position is at the center of the graphic’s bounding box.

circular_sector(radius: float, angle: float, color: Color) → Graphic

Creates a circular sector belonging to a circle of the given radius, filled with a color.

A circular sector is a portion of a circle enclosed between two radii and an arc. Considering a circle as a clock, the first radius is supposed to “point” towards 3 o’clock. The angle determines the position of the second radius, computed starting from the first one in counterclockwise direction. An angle of 360 degrees corresponds to a full circle.

The pinning position is at the center of the circle from which the circular sector is taken.

Parameters:

• radius – radius of the circle from which the circular sector is taken

• angle – central angle, in degrees

• color – the color to be used to fill the circular sector

Returns:

the specified circular sector as a graphic

ellipse(width: float, height: float, color: Color) → Graphic

Creates an ellipse with the given width and height, filled with a color.

When width and height are the same, the ellipse becomes a circle with a diameter equal to the provided size.

Parameters:

• width – width of the ellipse

• height – height of the ellipse

• color – the color to be used to fill the circle

Returns:

the specified circle as a graphic

empty_graphic() → Graphic

Creates an empty graphic. When an empty graphic is composed with any other graphic, it behaves as a neutral element: the result is always identical to the other graphic.

Returns:

an empty graphic (width and height 0)

rectangle(width: float, height: float, color: Color) → Graphic

Creates a rectangle of the given size, filled with a color.

Parameters:

• width – width of the rectangle

• height – height of the rectangle

• color – the color to be used to fill the rectangle

Returns:

the specified rectangle as a graphic

text(content: str, font: str, points: float, color: Color) → Graphic

Creates a graphic with the text rendered using the specified font, size and color.

When the indicated True-Type Font is not found in the system, a very basilar font that is always available is used instead. The resulting graphic has the minimal size that still fits the whole text.

The pinning position is horizontally aligned on the left and vertically on the baseline of the text.

Parameters:

• content – the text to render

• font – the name of the font (e.g., “arial” on Windows, “Arial” on macOS)

• points – size in typographic points (e.g., 16)

• color – the color to be used to render the text

Returns:

the specified text as a graphic

triangle(side1: float, side2: float, angle: float, color: Color) → Graphic

Creates a triangle specifying two sides and the angle between them, filled with a color. The first side extends horizontally to the right. The angle specifies how much the second side is rotated, counterclockwise, from the first one.

For all triangles, except obtuse ones, the bottom-left corner of the resulting graphic concides with the vertex of the triangle for which the angle is specified.

The pinning position is the centroid of the triangle.

Parameters:

• side1 – length of the first, horizontal side of the triangle

• side2 – length of the second side of the triangle

• angle – angle between the two sides, in degrees

• color – the color to be used to fill the triangle

Returns:

the specified triangle as a graphic