2.2 Basic Pict Constructors

When the rendering procedure is called, the current pen and brush will be solid and in the pict’s color (and linewidth), and the scale and offset of the dc will be set. The text mode will be transparent, but the font and text colors are not guaranteed to be anything in particular.

The style argument must be one of the following:

• null – the default, same as 'default

• a font% object

• a font family symbol, such a 'roman (see font%)

• a font face string, such as "Helvetica" (see font%)

• (cons str sym) combining a face string and a font family (in case the face is unavailable; see font%)

• (cons 'bold  style) for a valid style

• (cons 'italic  style)

• (cons 'subscript  style)

• (cons 'superscript  style)

• (cons 'caps  style)

• (cons 'combine  style) – allows kerning and ligatures (the default, unless the 'modern family is specified)

• (cons 'no-combine  style) – renders characters individually

If both 'combine and 'no-combine are specified, the first one takes precedence. If caps is specified, the angle must be zero.

The given size is in pixels, but it is ignored if a font% object is provided in the text-style.

The rotation is in radians, and positive values rotate counter-clockwise. For a non-zero rotation, the resulting pict’s bounding box covers the rotated text, and the descent is zero and the ascent is the height.

If draw-border? is #f, then the pen is set to be transparent before drawing the rectangle.

The angle determines how much the rectangle is rotated, in radians.

If the bitmap cannot be loaded, if the given bitmap% object is not valid, or if the bitmap-draft-mode parameter is set to #t, the result pict draws the word “bitmap failed”.

The size is used for the arrowhead size. Even though pip-line creates no arrowheads, it accepts the size argument for consistency with the other functions.

If under? is true, then the line and arrows are added under the existing pict drawing, instead of on top. If solid? is false, then the arrowheads are hollow instead of filled.

The start-angle, end-angle, start-pull, and end-pull arguments control the curve of the line:

• The start-angle and end-angle arguments specify the direction of curve at its start and end positions; if either is #f, it defaults to the angle of a straight line from the start position to end position.

• The start-pull and end-pull arguments specify a kind of momentum for the starting and ending angles; larger values preserve the angle longer.

When the hide-arrowhead? argument is a true value, then space for the arrowhead is left behind, but the arrowhead itself is not drawn.

The defaults produce a straight line.