After first creating an image using ImageTools:-Create, or loading an image with ImageTools:-Read, drawing operations can be performed on it using a number of primitives (functions that draw one kind of object). The first argument to each primitive is the image itself, as returned by Create or Read.

The SolidRectangle primitive draws a rectangle whose boundaries fall (perceptually) on the mathematical rectangle specified by two opposing corners. This differs from using the Poly primitive with matching line color and solid fill pattern in that with the latter, half of the thickness of the enclosing line segments falls outside of the boundaries.

The x1, y1, x2, and y2 arguments define the bounds of the rectangle. There is no requirement that x1 be less than x2 or y1 be less than y2. That is, any two opposing corners can be specified, in either order.

The color argument can be specified in one of several forms:

The color option can be specified as a keyword equation or as the 6th positional argument in the calling sequence.

This function is part of the ImageTools:-Draw package, so it can be used in the short form SolidRectangle(..) only after executing the command with(ImageTools:-Draw). However, it can always be accessed through the long form of the command by using ImageTools:-Draw:-SolidRectangle(..).

$\mathrm{with}\left(\mathrm{ImageTools}\right)\:$

$\mathrm{with}\left(\mathrm{ImageTools}:-\mathrm{Draw}\right)\:$

$\mathrm{img}≔\mathrm{Create}\left(240\,320\,\mathrm{channels}=3\,\mathrm{background}=\mathrm{white}\right)\:$

$\mathrm{SolidRectangle}\left(\mathrm{img}\,32\,32\,288\,208\,\mathrm{color}=0.5\right)$

$\mathrm{Embed}\left(\mathrm{img}\right)$

crossHair := proc( img :: Array, x :: numeric, y :: numeric, scale :: numeric )
   uses ImageTools:-Draw;
   Line(img,(x-1.5)*scale,y*scale,(x+1.5)*scale,y*scale,
        color="red",thickness=1.5);
   Line(img,x*scale,(y-1.5)*scale,x*scale,(y+1.5)*scale,
        color="red",thickness=1.5)
end:

gridFill := proc( img :: Array, interval :: numeric )
   local x, y, w, h;
   uses ImageTools:-Draw;
   w, h := Width(img), Height(img);
   for x from interval by interval while x < w do
       Line(img,x,0,x,h,color=[0,1,1,0.25])
   od;
   for y from interval by interval while y < h do
       Line(img,0,y,w,y,color=[0,1,1,0.25])
   od
end:

$\mathrm{img}≔\mathrm{Create}\left(15\&comma;20\&comma;\mathrm{channels}=3\&comma;\mathrm{background}=\mathrm{white}\right)\&colon;$

$\mathrm{SolidRectangle}\left(\mathrm{img}\&comma;2\&comma;2\&comma;18\&comma;13\&comma;\mathrm{color}=0.5\right)$

$\mathrm{img}≔\mathrm{Scale}\left(\mathrm{img}\&comma;16\&comma;\mathrm{method}=\mathrm{nearest}\right)\&colon;$

$\mathrm{gridFill}\left(\mathrm{img}\&comma;16\right)$

$\mathrm{crossHair}\left(\mathrm{img}\&comma;2\&comma;2\&comma;16\right)$

$\mathrm{crossHair}\left(\mathrm{img}\&comma;18\&comma;13\&comma;16\right)$

$\mathrm{Embed}\left(\mathrm{img}\right)$

$\mathrm{img}≔\mathrm{Create}\left(15\&comma;20\&comma;\mathrm{channels}=3\&comma;\mathrm{background}=\mathrm{white}\right)\&colon;$

$\mathrm{SolidRectangle}\left(\mathrm{img}\&comma;2.5\&comma;2\&comma;18\&comma;12.7\&comma;\mathrm{color}=0.5\right)$

$\mathrm{img}≔\mathrm{Scale}\left(\mathrm{img}\&comma;16\&comma;\mathrm{method}=\mathrm{nearest}\right)\&colon;$

$\mathrm{gridFill}\left(\mathrm{img}\&comma;16\right)$

$\mathrm{crossHair}\left(\mathrm{img}\&comma;2.5\&comma;2\&comma;16\right)$

$\mathrm{crossHair}\left(\mathrm{img}\&comma;18\&comma;12.7\&comma;16\right)$

$\mathrm{Embed}\left(\mathrm{img}\right)$

The ImageTools[Draw][SolidRectangle] command was introduced in Maple 2018.

For more information on Maple 2018 changes, see Updates in Maple 2018.