add more agressive notes with pointers to the nitty gritty section
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Robby Findler
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@ -35,13 +35,27 @@
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@teachpack["image"]{Images}
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@(define mode/color-text
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@(define mode/color-and-nitty-text
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(make-splice
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@list{If the @racket[mode] is @racket['outline] or @racket["outline"], then the last
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argument can be a @racket[pen] struct or an @racket[image-color?], but if the @racket[mode]
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@list{
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Note that when the @racket[mode] is @racket['outline] or @racket["outline"], the shape
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may draw outside of its bounding box and thus parts of the image may disappear
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when it is cropped. See @secref["nitty-gritty"] (in the @seclink["image-guide"])
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for a more careful explanation of the ramifications of this fact.
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If the @racket[_mode] argument is @racket['outline] or @racket["outline"], then the last
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argument can be a @racket[pen] struct or an @racket[image-color?], but if the @racket[_mode]
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is @racket['solid] or @racket["solid"], then the last argument must be an
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@racket[image-color?].}))
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@(define crop-warning
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(make-splice
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@list{Some shapes (notably those with @racket['outline] or @racket["outline"] as
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the @racket[_mode] argument) draw outside of their bounding boxes and thus
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cropping them may remove part of them (often the lower-left and lower-right
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edges). See @secref["nitty-gritty"] (in the @seclink["image-guide"])
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for a more careful discussion of this issue.}))
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@defmodule[#:require-form beginner-require 2htdp/image]
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The image teachpack provides a number of basic image construction functions, along with
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@ -62,7 +76,7 @@ Existing images can be rotated, scaled, flipped, and overlaid on top of each oth
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image?])]{
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Constructs a circle with the given radius, height, mode, and color.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(circle 30 "outline" "red")
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(circle 20 "solid" "blue")
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@ -82,7 +96,7 @@ Existing images can be rotated, scaled, flipped, and overlaid on top of each oth
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image?])]{
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Constructs an ellipse with the given width, height, mode, and color.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(ellipse 60 30 "outline" "black")
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(ellipse 30 60 "solid" "blue")
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@ -239,7 +253,7 @@ Unlike @racket[scene+curve], if the line passes outside of @racket[image], the i
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determines the
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length of the side of the triangle.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle 40 "solid" "tan")]
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@ -259,7 +273,7 @@ Unlike @racket[scene+curve], if the line passes outside of @racket[image], the i
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Constructs a triangle with a right angle where the two sides adjacent
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to the right angle have lengths @racket[side-length1] and @racket[side-length2].
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(right-triangle 36 48 "solid" "black")]
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}
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@ -281,7 +295,7 @@ Unlike @racket[scene+curve], if the line passes outside of @racket[image], the i
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@racket[180], then the triangle will point up and if the @racket[angle]
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is more, then the triangle will point down.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(isosceles-triangle 200 170 "solid" "seagreen")
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(isosceles-triangle 60 30 "solid" "aquamarine")
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@ -321,7 +335,7 @@ They all construct a triangle oriented as follows:
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Creates a triangle where the side lengths a, b, and, c are given by @racket[side-length-a],
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@racket[side-length-b], and, @racket[side-length-c] respectively.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/sss 40 60 80 "solid" "seagreen")
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(triangle/sss 80 40 60 "solid" "aquamarine")
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@ -344,7 +358,7 @@ They all construct a triangle oriented as follows:
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@racket[side-length-b], and, @racket[side-length-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/ass 10 60 100 "solid" "seagreen")
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(triangle/ass 90 60 100 "solid" "aquamarine")
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@ -367,7 +381,7 @@ They all construct a triangle oriented as follows:
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@racket[angle-b], and, @racket[side-length-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/sas 60 10 100 "solid" "seagreen")
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(triangle/sas 60 90 100 "solid" "aquamarine")
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@ -390,7 +404,7 @@ They all construct a triangle oriented as follows:
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@racket[side-length-b], and, @racket[angle-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/ssa 60 100 10 "solid" "seagreen")
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(triangle/ssa 60 100 90 "solid" "aquamarine")
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@ -412,7 +426,7 @@ They all construct a triangle oriented as follows:
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@racket[angle-b], and, @racket[side-length-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/aas 10 40 200 "solid" "seagreen")
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(triangle/aas 90 40 200 "solid" "aquamarine")
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@ -435,7 +449,7 @@ They all construct a triangle oriented as follows:
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@racket[side-length-b], and, @racket[angle-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/asa 10 200 40 "solid" "seagreen")
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(triangle/asa 90 200 40 "solid" "aquamarine")
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@ -458,7 +472,7 @@ They all construct a triangle oriented as follows:
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@racket[angle-b], and, @racket[angle-c] respectively.
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See above for a diagram showing where which sides and which angles are which.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(triangle/saa 200 10 40 "solid" "seagreen")
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(triangle/saa 200 90 40 "solid" "aquamarine")
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@ -477,7 +491,7 @@ They all construct a triangle oriented as follows:
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Constructs a square.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(square 40 "solid" "slateblue")
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(square 50 "outline" "darkmagenta")]
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@ -496,7 +510,7 @@ They all construct a triangle oriented as follows:
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image?])]{
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Constructs a rectangle with the given width, height, mode, and color.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(rectangle 40 20 "outline" "black")
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(rectangle 20 40 "solid" "blue")]
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@ -516,7 +530,7 @@ They all construct a triangle oriented as follows:
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Constructs a four sided polygon with all equal sides and thus where opposite angles are equal to each
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other. The top and bottom pair of angles is @racket[angle] and the left and right are @racket[(- 180 angle)].
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(rhombus 40 45 "solid" "magenta")
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(rhombus 80 150 "solid" "mediumpurple")]
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@ -533,7 +547,7 @@ other. The top and bottom pair of angles is @racket[angle] and the left and righ
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Constructs a star with five points. The @racket[side-length] argument
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determines the side length of the enclosing pentagon.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(star 40 "solid" "gray")]
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@ -561,7 +575,7 @@ other. The top and bottom pair of angles is @racket[angle] and the left and righ
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For example, if @racket[side-count] is @racket[5] and @racket[step-count] is @racket[2],
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then this function produces a shape just like @racket[star].
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(star-polygon 40 5 2 "solid" "seagreen")
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(star-polygon 40 7 3 "outline" "darkred")
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@ -603,7 +617,7 @@ the @racket[point-count] argument determines how many points the star has.
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image?])]{
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Constructs a regular polygon with @racket[side-count] sides.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(regular-polygon 50 3 "outline" "red")
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(regular-polygon 40 4 "outline" "blue")
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@ -621,7 +635,7 @@ the @racket[point-count] argument determines how many points the star has.
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image?])]{
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Constructs a polygon connecting the given vertices.
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@mode/color-text
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@mode/color-and-nitty-text
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@image-examples[(polygon (list (make-posn 0 0)
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(make-posn -10 20)
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@ -994,6 +1008,8 @@ a black outline.
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same size as @racket[scene]. The coordinates are relative to the top-left
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of @racket[scene].
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@crop-warning
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@image-examples[(place-image
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(triangle 32 "solid" "red")
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24 24
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@ -1027,6 +1043,8 @@ a black outline.
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crops the resulting image so that it has the
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same size as @racket[scene].
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@crop-warning
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@image-examples[(place-image/align (triangle 48 "solid" "yellowgreen")
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64 64 "right" "bottom"
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(rectangle 64 64 "solid" "mediumgoldenrod"))
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@ -1058,6 +1076,8 @@ a black outline.
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and going to the point (@racket[x2],@racket[y2]); unlike
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@racket[add-line], this function crops the resulting image to the size of @racket[scene].
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@crop-warning
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@image-examples[(scene+line (ellipse 40 40 "outline" "maroon")
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0 40 40 0 "maroon")
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(scene+line (rectangle 40 40 "solid" "gray")
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@ -1089,6 +1109,8 @@ mean that the curve stays with the angle longer.
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Unlike @racket[add-curve], this function crops the curve, only showing
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the parts that fit onto @racket[scene].
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@crop-warning
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@image-examples[(scene+curve (rectangle 100 100 "solid" "black")
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20 20 0 1/3
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80 80 0 1/3
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@ -1192,6 +1214,8 @@ the parts that fit onto @racket[scene].
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Crops @racket[image] to the rectangle with the upper left at the point (@racket[x],@racket[y])
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and with @racket[width] and @racket[height].
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@crop-warning
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@image-examples[(crop 0 0 40 40 (circle 40 "solid" "chocolate"))
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(crop 40 60 40 60 (ellipse 80 120 "solid" "dodgerblue"))
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(above
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