From a566cd488ac8c3c28b21cdbb8f385c4320ef38e5 Mon Sep 17 00:00:00 2001 From: Robby Findler Date: Tue, 10 Nov 2009 23:54:53 +0000 Subject: [PATCH] added isosceles-triangle svn: r16677 --- collects/2htdp/image.ss | 1 + collects/2htdp/private/image-more.ss | 20 ++++-- .../teachpack/2htdp/scribblings/image-toc.ss | 61 +++++++++--------- .../teachpack/2htdp/scribblings/image.scrbl | 17 +++++ .../teachpack/2htdp/scribblings/img/10.png | Bin 1246 -> 685 bytes .../teachpack/2htdp/scribblings/img/11.png | Bin 1553 -> 659 bytes .../teachpack/2htdp/scribblings/img/12.png | Bin 4216 -> 674 bytes .../teachpack/2htdp/scribblings/img/13.png | Bin 1339 -> 1246 bytes .../teachpack/2htdp/scribblings/img/14.png | Bin 1073 -> 1553 bytes .../teachpack/2htdp/scribblings/img/15.png | Bin 3766 -> 4216 bytes .../teachpack/2htdp/scribblings/img/16.png | Bin 1058 -> 1339 bytes .../teachpack/2htdp/scribblings/img/17.png | Bin 1485 -> 1073 bytes .../teachpack/2htdp/scribblings/img/18.png | Bin 1388 -> 3766 bytes .../teachpack/2htdp/scribblings/img/19.png | Bin 1135 -> 1058 bytes .../teachpack/2htdp/scribblings/img/20.png | Bin 2161 -> 1485 bytes .../teachpack/2htdp/scribblings/img/21.png | Bin 893 -> 1388 bytes .../teachpack/2htdp/scribblings/img/22.png | Bin 282 -> 1135 bytes .../teachpack/2htdp/scribblings/img/23.png | Bin 1297 -> 2161 bytes .../teachpack/2htdp/scribblings/img/24.png | Bin 121 -> 893 bytes .../teachpack/2htdp/scribblings/img/25.png | Bin 144 -> 282 bytes .../teachpack/2htdp/scribblings/img/26.png | Bin 142 -> 1297 bytes .../teachpack/2htdp/scribblings/img/27.png | Bin 2121 -> 121 bytes .../teachpack/2htdp/scribblings/img/28.png | Bin 2270 -> 144 bytes .../teachpack/2htdp/scribblings/img/29.png | Bin 2368 -> 142 bytes .../teachpack/2htdp/scribblings/img/30.png | Bin 1007 -> 2121 bytes .../teachpack/2htdp/scribblings/img/31.png | Bin 1000 -> 2270 bytes .../teachpack/2htdp/scribblings/img/32.png | Bin 678 -> 2368 bytes .../teachpack/2htdp/scribblings/img/33.png | Bin 865 -> 1007 bytes .../teachpack/2htdp/scribblings/img/34.png | Bin 865 -> 1000 bytes .../teachpack/2htdp/scribblings/img/35.png | Bin 1039 -> 678 bytes .../teachpack/2htdp/scribblings/img/36.png | Bin 1039 -> 865 bytes .../teachpack/2htdp/scribblings/img/37.png | Bin 420 -> 865 bytes .../teachpack/2htdp/scribblings/img/38.png | Bin 2314 -> 1039 bytes .../teachpack/2htdp/scribblings/img/39.png | Bin 0 -> 1039 bytes .../teachpack/2htdp/scribblings/img/40.png | Bin 0 -> 420 bytes .../teachpack/2htdp/scribblings/img/41.png | Bin 0 -> 2314 bytes 36 files changed, 65 insertions(+), 34 deletions(-) create mode 100644 collects/teachpack/2htdp/scribblings/img/39.png create mode 100644 collects/teachpack/2htdp/scribblings/img/40.png create mode 100644 collects/teachpack/2htdp/scribblings/img/41.png diff --git a/collects/2htdp/image.ss b/collects/2htdp/image.ss index fbad8e8f2a..bb77569424 100644 --- a/collects/2htdp/image.ss +++ b/collects/2htdp/image.ss @@ -71,6 +71,7 @@ and they all have good sample contracts. (It is amazing what we can do with kids star star-polygon triangle + isosceles-triangle text text/font diff --git a/collects/2htdp/private/image-more.ss b/collects/2htdp/private/image-more.ss index c6e5259fcb..95fab9ae76 100644 --- a/collects/2htdp/private/image-more.ss +++ b/collects/2htdp/private/image-more.ss @@ -658,6 +658,15 @@ (make-bb w h (- h d)) #f)))) +(define/chk (isosceles-triangle side-length angle mode color) + (let ([left-corner (make-polar side-length (+ (* pi 1/2) (/ (degrees->radians angle) 2)))] + [right-corner (make-polar side-length (- (* pi 1/2) (/ (degrees->radians angle) 2)))]) + (make-a-polygon (list (make-point 0 0) + (make-point (real-part right-corner) (imag-part right-corner)) + (make-point (real-part left-corner) (imag-part left-corner))) + mode + color))) + (define/chk (triangle side-length mode color) (make-polygon/star side-length 3 mode color values)) @@ -681,15 +690,15 @@ (make-polygon/star side-length 5 mode color (λ (l) (swizzle l 2)))) (define (make-polygon/star side-length side-count mode color adjust) - (let ([poly (make-polygon - (adjust (regular-polygon-points side-length side-count)) - mode - color)]) + (make-a-polygon (adjust (regular-polygon-points side-length side-count)) + mode color)) + +(define (make-a-polygon points mode color) + (let ([poly (make-polygon points mode color)]) (let-values ([(l t r b) (simple-bb poly)]) (make-image (make-translate (- l) (- t) poly) (make-bb (- r l) (- b t) (- b t)) #f)))) - (define (gcd a b) (cond [(zero? b) a] @@ -798,6 +807,7 @@ regular-polygon triangle + isosceles-triangle star star-polygon diff --git a/collects/teachpack/2htdp/scribblings/image-toc.ss b/collects/teachpack/2htdp/scribblings/image-toc.ss index e2a29de2e0..14177c1d16 100644 --- a/collects/teachpack/2htdp/scribblings/image-toc.ss +++ b/collects/teachpack/2htdp/scribblings/image-toc.ss @@ -28,18 +28,18 @@ (ellipse 20 30 "solid" "slateblue") (ellipse 20 10 "solid" "navy")) 'image - "38.png") - (list '(frame (ellipse 20 20 "outline" "black")) 'image "37.png") - (list '(ellipse 60 60 "solid" "blue") 'image "36.png") - (list '(scale/xy 3 2 (ellipse 20 30 "solid" "blue")) 'image "35.png") - (list '(ellipse 40 60 "solid" "blue") 'image "34.png") - (list '(scale 2 (ellipse 20 30 "solid" "blue")) 'image "33.png") - (list '(rotate 5 (rectangle 50 50 "outline" "black")) 'image "32.png") - (list '(rotate 45 (ellipse 60 20 "solid" "olivedrab")) 'image "31.png") + "41.png") + (list '(frame (ellipse 20 20 "outline" "black")) 'image "40.png") + (list '(ellipse 60 60 "solid" "blue") 'image "39.png") + (list '(scale/xy 3 2 (ellipse 20 30 "solid" "blue")) 'image "38.png") + (list '(ellipse 40 60 "solid" "blue") 'image "37.png") + (list '(scale 2 (ellipse 20 30 "solid" "blue")) 'image "36.png") + (list '(rotate 5 (rectangle 50 50 "outline" "black")) 'image "35.png") + (list '(rotate 45 (ellipse 60 20 "solid" "olivedrab")) 'image "34.png") (list '(beside/places "baseline" (text "ijy" 18 "black") (text "ijy" 24 "black")) 'image - "30.png") + "33.png") (list '(beside/places "center" @@ -48,7 +48,7 @@ (ellipse 20 30 "solid" "purple") (ellipse 20 10 "solid" "indigo")) 'image - "29.png") + "32.png") (list '(beside/places "bottom" @@ -57,7 +57,7 @@ (ellipse 20 30 "solid" "slateblue") (ellipse 20 10 "solid" "navy")) 'image - "28.png") + "31.png") (list '(beside (ellipse 20 70 "solid" "gray") @@ -65,7 +65,7 @@ (ellipse 20 30 "solid" "dimgray") (ellipse 20 10 "solid" "black")) 'image - "27.png") + "30.png") (list '(overlay/xy (rectangle 10 10 "solid" "red") @@ -73,7 +73,7 @@ -10 (rectangle 10 10 "solid" "black")) 'image - "26.png") + "29.png") (list '(overlay/xy (rectangle 10 10 "solid" "red") @@ -81,7 +81,7 @@ 10 (rectangle 10 10 "solid" "black")) 'image - "25.png") + "28.png") (list '(overlay/xy (rectangle 10 10 "outline" "red") @@ -89,7 +89,7 @@ 0 (rectangle 10 10 "outline" "black")) 'image - "24.png") + "27.png") (list '(overlay/xy (ellipse 40 40 "outline" "black") @@ -97,7 +97,7 @@ 25 (ellipse 10 10 "solid" "forestgreen")) 'image - "23.png") + "26.png") (list '(overlay/places "right" @@ -107,7 +107,7 @@ (rectangle 40 40 "solid" "red") (rectangle 50 50 "solid" "black")) 'image - "22.png") + "25.png") (list '(overlay/places "middle" @@ -115,7 +115,7 @@ (rectangle 30 60 "solid" "orange") (ellipse 60 30 "solid" "purple")) 'image - "21.png") + "24.png") (list '(overlay (ellipse 10 10 "solid" "red") @@ -125,31 +125,34 @@ (ellipse 50 50 "solid" "red") (ellipse 60 60 "solid" "black")) 'image - "20.png") + "23.png") (list '(overlay (ellipse 60 30 "solid" "purple") (rectangle 30 60 "solid" "orange")) 'image - "19.png") + "22.png") (list '(text/font "not really a link" 18 "blue" #f 'roman 'normal 'normal #t) 'image - "18.png") + "21.png") (list '(text/font "Goodbye" 18 "indigo" #f 'modern 'italic 'normal #f) 'image - "17.png") + "20.png") (list '(text/font "Hello" 24 "olive" "Gill Sans" 'swiss 'normal 'bold #f) 'image - "16.png") - (list '(text "Goodbye" 36 "indigo") 'image "15.png") - (list '(text "Hello" 24 "olive") 'image "14.png") - (list '(star-polygon 20 10 3 "solid" "cornflowerblue") 'image "13.png") - (list '(star-polygon 40 7 3 "outline" "darkred") 'image "12.png") - (list '(star-polygon 40 5 2 "solid" "seagreen") 'image "11.png") - (list '(star 40 "solid" "gray") 'image "10.png") + "19.png") + (list '(text "Goodbye" 36 "indigo") 'image "18.png") + (list '(text "Hello" 24 "olive") 'image "17.png") + (list '(star-polygon 20 10 3 "solid" "cornflowerblue") 'image "16.png") + (list '(star-polygon 40 7 3 "outline" "darkred") 'image "15.png") + (list '(star-polygon 40 5 2 "solid" "seagreen") 'image "14.png") + (list '(star 40 "solid" "gray") 'image "13.png") + (list '(isosceles-triangle 60 330 "solid" "lightseagreen") 'image "12.png") + (list '(isosceles-triangle 60 30 "solid" "aquamarine") 'image "11.png") + (list '(isosceles-triangle 200 170 "solid" "seagreen") 'image "10.png") (list '(triangle 40 "solid" "tan") 'image "9.png") (list '(regular-polygon 20 6 "solid" "red") 'image "8.png") (list '(regular-polygon 20 4 "outline" "blue") 'image "7.png") diff --git a/collects/teachpack/2htdp/scribblings/image.scrbl b/collects/teachpack/2htdp/scribblings/image.scrbl index 40f0adb452..4dc314ecc3 100644 --- a/collects/teachpack/2htdp/scribblings/image.scrbl +++ b/collects/teachpack/2htdp/scribblings/image.scrbl @@ -73,6 +73,23 @@ Existing images can be rotated, scaled, and overlaid on top of each other. @image-examples[(triangle 40 "solid" "tan")] } +@defproc[(isosceles-triangle [side-length (and/c positive? real?)] + [angle angle?] + [mode mode?] + [color (or/c symbol? string?)]) + image?]{ + + Creates a triangle with two equal-length sides, of length @scheme[side-length] + where the angle between those sides is @scheme[angle]. The third + leg is straight, horizontally. If the angle is less than + @scheme[180], then the triangle will point up and if the @scheme[angle] + is more, then the triangle will point down. + + @image-examples[(isosceles-triangle 200 170 "solid" "seagreen") + (isosceles-triangle 60 30 "solid" "aquamarine") + (isosceles-triangle 60 330 "solid" "lightseagreen")] +} + @defproc[(star [side-length (and/c real? positive?)] [mode mode?] [color (or/c symbol? string?)]) diff --git a/collects/teachpack/2htdp/scribblings/img/10.png b/collects/teachpack/2htdp/scribblings/img/10.png index dbbf37c78f345f6baa2bcfab7ab50c954a01f5e0..e650be6e6981c2da005add5c20c5099883a9bf46 100644 GIT binary patch literal 685 zcmV;e0#f~nP)5ig66h;Mc0TEEU=lx%A+L5I!3R!D@uviLhGWKY(d?$t=iRNm|$^Gs{g>yaw;Afh69DQ5+%i0_Eu0A=` zUfZrV@2Ldz76@z1L}@H`LrqWAJpB{;1Ns4|iu$o}zU$F;#&&PmYi%jJOz=V=tf7(> zxscJWO7f!WQspG@Sd0K;OvSbl6evgb~(P8@wZo$NUV zVZ~Y6xz`uB{u5mAgXu7x?Ado=Wkv2s=kM-&bXjl;11$Ifc#Njb@3x!+&7Lxa#b-Q- z=&gXN$abo)kPDSn9srX3L@WPL%*dmb&?fE1g05D<{MX}bVXfa1Om6_+ 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