plot/core

src/plot/core.tur

defn

plot-into-canvas

(plot-into-canvas [canvas : int renderers : int opts : int px : int py : int pw : int ph : int] :)

render into an existing canvas and viewport.

defn

(plot [renderers : int opts : int] :)

render a Vec[Renderer] to a new surface and return it.

defn

(plot-write-png [renderers : int opts : int path : cstr] :)

render a Vec[Renderer] and write it to a PNG file.

Internal definitions

__ok-- create an ok result wrapping integer value v.

__err-- create an err result wrapping integer error value e.

__ok?-- predicate for the local :ptr<void> result envelope.

__ok-val-- extract the ok payload from the local :ptr<void> result envelope.

__err-val-- extract the err payload from the local :ptr<void> result envelope.

__make-renderer-- allocate the generic opaque renderer handle used by all plot modules.

__renderer-floats-- attach the six generic float payload slots to a renderer.

__renderer-ints-- attach the four generic integer payload slots to a renderer.

__renderer-bounds-- attach explicit bounds hints to a renderer.

__surface-create-- allocate a new plutovg surface.

__surface-destroy-- destroy a plutovg surface.

__surface-write-png-- write a plutovg surface to a PNG file.

__canvas-create-- allocate a canvas for an existing surface.

__canvas-destroy-- destroy a plutovg canvas.

__surface-width-- width of a plutovg surface in pixels.

__surface-height-- height of a plutovg surface in pixels.

__surface-pixel-byte-- read a single byte from the surface's raw pixel buffer.

__count-non-background-- count pixels in [x0, x1) x [y0, y1) that are not background.

__pixel-is-background?-- true when a pixel is near pure white (>=250 in all RGB channels and full alpha).

__plot-sample-adaptive-- adaptive subdivision sampler for sampled-line renderers.

data->viewport-- map data coordinates to viewport coordinates.

viewport->data-- map viewport coordinates back to data coordinates.