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| -rw-r--r-- | Gui_Exploration.rkt | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/Gui_Exploration.rkt b/Gui_Exploration.rkt new file mode 100644 index 0000000..ff4d2d3 --- /dev/null +++ b/Gui_Exploration.rkt @@ -0,0 +1,129 @@ +#lang racket +(require racket/gui/base) +;;Step 1. Create a window to draw into +(define frame(new frame% [label "Example"])) +;;I don't know what frame% means, but new must be a procedure +;;(send frame show #t) Running this command displays the frame +;;send appears to be a command to be a procedure that takes a frame +;; followed by a command and a boolean. +;;the boolean is fed into the command in this case +;;if you said #f it would close the window +;;that is usefull +;;Below is a slight expantion on example code +;;letting the button be a toggle +(define frame2 (new frame%[label "Example2"])) +(define msg (new message% [parent frame2] [label " Nothing "])) +(define thingy #t) +(define button-to-click (new button% + [parent frame2] + [label "Click"] + [callback (lambda (button event) + (if thingy + (begin (set! thingy #f) + (send msg set-label "Something")) + (begin (set! thingy #t) + (send msg set-label " Nothing "))))])) +;;Frames are okay ish for error messages but the real stuff is +;;in canvas stuff +(define my-canvas% + (class canvas% + (define/override (on-event event) + (send msg set-label "Canvas mouse")) + (define/override (on-char event) + (send msg set-label "Canvas keyboard")) + (super-new)));;Don't know what that one means + +(define canvas-thing (new my-canvas% [parent frame2]));;unfortunately +;;we still need to re-size it manually +;;Now I wonder if we could create a procedure to make any text +;;appear +(define frame3 (new frame%[label "Example3"])) +(define blank (new message% [parent frame3] [label " "])) +(define (make-text string) (begin (send blank set-label string))) +;(send frame3 show #t) +;(make-text "Hello World") works exactly fine. +;;Now lets do something more complicated +;;We want to create a procedure that creates a new line +;;each time it is called so... +(define frame4 (new frame%[label "Example4"])) +;;now blank4 should be a procedure to create multiple lines in the frame +(define (make-text-line string) (begin (new message% + [parent frame4] + [label string]))) +;;display with +;;(send frame4 show #t) +;;add text with +;;(make-text-line "Hello World!") +;;This works for not but there are a few problems +;;first of all the window starts really small and doesn't restrict +;;resizing. Second it is always in the middle of the frame +;;Third, once text is on screen there is no way to get it off +;;But we can do better +(define frame5 (new frame% + [label "Example5"] + [width 300] + [height 300])) +(define canvas5 (new canvas% [parent frame5] + [paint-callback + (lambda (canvas dc) + (send dc set-scale 3 3) + (send dc set-text-foreground "blue") + (send dc draw-text "Don't Panic!" 0 0))])) +;;above is the example code to write some simple text, however +;;we can apply this to what we learned above to make something abit +;;more +(define frame6 (new frame% + [label "Example6"] + [width 600] + [height 700])) +(define (make-color-text string color) + (begin (new canvas% + [parent frame6] + [paint-callback + (lambda (canvas dc) + (send dc set-text-foreground color) + (send dc draw-text string 0 0 #f))]))) +;;display with +;;(send frame6 show #t) +;;write text with +;;(make-color-text "Hello World!" "purple") +;;Okay that doesn't exactly work as planned... +;;the problem with this is that each message is it's own canvas now +;;not only that but it means we can only print each line in it's +;;own color. So new plan is to make it so it adds on new strings +;;to one canvas, adding \n as nessessary. Except nevermind since +;;\n doesn't exist in this apparently + +;;Lets switch back to text and we can change it later +(define frame7 (new frame% + [label "Example7"] + [width 600] + [height 200])) +(define (make-blank-line i) + (new message% + [parent frame7] + [label " "])) +;;80 space characters +;;the i is only there to make the build-list command happy +(define Message-list (build-list 10 make-blank-line)) +;;10 make-blank-lines +;;that build-list command is super usefull for something like this +(define (move-down-list list) + (if (eq? '() (cdr list)) + '() + (begin + (move-down-list (cdr list)) + (send (car (cdr list)) set-label (send (car list) get-label))))) +(define (send-word string) + (begin + (move-down-list Message-list) + (send (car Message-list) set-label string))) +;;display with +;;(send frame7 show #t) +;;add text with +;;(send-word "Hello World") +;;Now using the send-word command I can make each word appear on the +;;screen in the place where it used to be. Starting at the top of the +;;screen and working it's way down the more text is added. +;;on the bottom line, after adding 10 lines of text, it will remove the bottom +;;most line
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