2.9 Rendering
| (dc-for-text-size) → (or/c #f (is-a?/c dc<%>)) |
| (dc-for-text-size dc) → void? |
| dc : (or/c #f (is-a?/c dc<%>)) |
A parameter that is used to determine the bounding box of picts
created with text.
The drawing context installed in this parameter need not be the same as the ultimate drawing context, but it should measure text in the same way. Under normal circumstances, font metrics are the same for all drawing contexts, so the default value of dc-for-text-size is a bitmap-dc% that draws to a 1-by-1 bitmap.
Draws pict to dc, with its top-left corner at offset
(x, y).
Generates a pict-drawer procedure for multiple renderings of
pict. Using the generated procedure can be faster than
repeated calls to draw-pict.
| (show-pict pict [w h]) → void? |
| pict : pict? |
| w : (or/c #f exact-nonnegative-integer?) = #f |
| h : (or/c #f exact-nonnegative-integer?) = #f |
Opens a frame that displays pict. The frame adds one method,
set-pict, which takes a pict to display. The optional
w and h arguments specify a minimum size for the
frame’s drawing area.
| (current-expected-text-scale) → (list real? real?) |
| (current-expected-text-scale scales) → void? |
| scales : (list real? real?) |
A parameter used to refine text measurements to better match an
expected scaling of the image. The scale/improve-new-text
form sets this parameter while also scaling the resulting pict.