2.4 Pict Drawing Adjusters
(scale pict factor) → pict? pict : pict? factor : real? (scale pict w-factor h-factor) → pict? pict : pict? w-factor : real? h-factor : real?
Scales a pict drawing, as well as its bounding-box. The drawing is scaled by adjusting the destination dc<%>’s scale while drawing the original pict.
Rotates a pict’s drawing by theta radians counter-clockwise.
The bounding box of the resulting pict is the box encloses the rotated corners of pict (which inflates the area of the bounding box, unless theta is a multiple of half of pi). The ascent and descent lines of the result’s bounding box are the horizontal lines that bisect the rotated original lines; if the ascent line drops below the descent line, the two lines are flipped.
Creats a container picture that doesn’t draw the child picture, but uses the child’s size.
Selects a specific pen width for drawing, which applies to pen drawing for pict that does not already use a specific pen width. A #f value for w makes the pen transparent (in contrast to a zero value, which means “as thin as possible for the target device”).
(linestyle style pict) → pict?
(one-of/c 'transparent 'solid 'xor 'hilite 'dot 'long-dash 'short-dash 'dot-dash 'xor-dot 'xor-long-dash 'xor-short-dash 'xor-dot-dash) pict : pict?
Selects a specific pen style for drawing, which applies to pen drawing for pict that does not already use a specific pen style.
(colorize pict color) → pict? pict : pict?
(or/c string? (is-a?/c color%) (list (integer-in 0 255) (integer-in 0 255) (integer-in 0 255)))
Selects a specific color drawing, which applies to drawing in pict that does not already use a specific color. The black-and-white parameter causes all non-white colors to be converted to black.
(cellophane pict opacity) → pict? pict : pict? opacity : (real-in 0 1)
Makes the given pict semi-transparent, where an opacity of 0 is fully transparent, and an opacity of 1 is fully opaque. See set-alpha for information about the contexts and cases when semi-transparent drawing works.
Clips a pict’s drawing to its bounding box.
(inset/clip pict amt) → pict? pict : pict? amt : real? (inset/clip pict h-amt v-amt) → pict? pict : pict? h-amt : real? v-amt : real? (inset/clip pict l-amt t-amt r-amt b-amt) → pict? pict : pict? l-amt : real? t-amt : real? r-amt : real? b-amt : real?
Insets and clips the pict’s drawing to its bounding box. Usually, the inset amounts are negative.
(scale/improve-new-text pict-expr scale-expr) (scale/improve-new-text pict-expr x-scale-expr y-scale-expr)
Like the scale procedure, but also sets current-expected-text-scale while evaluating pict-expr.
(black-and-white) → boolean? (black-and-white on?) → void? on? : any/c
A parameter that determines whether colorize uses color or black-and-white colors.