# Creator: Pathetic Writer 3.1.0-alpha. No Warranty.
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# /home/ulric/siag/pw/examples/egon.pw
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1 1 1	"Egon Animator
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font Times
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3 1 0	"The latest addition to the Siag family is a program to create animated sequences.
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4 1 0	"Examples of where such a program can be useful is:
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6 1 13	"Presentation graphics
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7 1 13	"Computerized toons
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8 1 13	"Demonstrations
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9 1 13	"Animated GIF creation
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11 1 0	"The name of this program is Egon Animator. The look and feel of the program is very
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12 1 0	"similar to that of Siag and Pathetic Writer; however not all of their powerful features like
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13 1 0	"embedding are yet implemented. But the core of the program is the same, in fact the three
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14 1 0	"programs share much of the same source. The multiple interpreter support is present
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15 1 0	"(with only SIOD implemented properly, but the hooks are there for Guile and Tcl).
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17 1 2	"Why an animation program?
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19 1 0	"Well, why not? When I first started working on my spreadsheet Siag, the long term goal
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20 1 0	"was to create a full, free office package. Now that Siag and the word processor Pathetic
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21 1 0	"Writer are operational, if not finished, it seemed like a small but natural step to add a
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22 1 0	"simple program to create presentation graphics. As usual, I had an old program lying
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23 1 0	"around which could be botched into a new role.
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25 1 2	"So, what is it like?
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27 1 0	"Egon has an editing interface with three lists for the objects, the ticks and the properties.
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28 1 0	"Objects include rectangles, lines, pixmaps and so on. Every object has a list of one or
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29 1 0	"more ticks, which are "milestones" telling where the object should be at a particular time,
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30 1 0	"what shape, colour and so on. When the animation is played, Egon automatically
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31 1 0	"interpolates intermediate positions between the ticks so that a smooth linear movement
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32 1 0	"can be specified with only the endpoints.
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34 1 0	"There will also be a Visual Basic-style interface where objects can be chosen from a
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35 1 0	"palette and placed on the animation window using drag-and-drop, but that is not yet
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36 1 0	"implemented.
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38 1 0	"The animations are stored as Scheme scripts in human-readable form so that they can be
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39 1 0	"edited manually. It is also easy to write scripts without using the editing interface at all.
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40 1 0	"For example, here is a script to create a ticker-tape:
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font Courier
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42 1 10	"(define (ticker-tape width height duration text)
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43 1 10	"  (ani-object ANI_LINE)
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44 1 10	"  (ani-properties ANI_X 0 ANI_Y (- height 21) ANI_WIDTH width)
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45 1 10	"  (ani-object ANI_FILLRECT)
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46 1 10	"  (ani-properties ANI_X 0 ANI_Y (- height 20))
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47 1 10	"  (ani-properties ANI_WIDTH width ANI_HEIGHT 20)
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48 1 10	"  (ani-properties ANI_COLOR WHITE)
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49 1 10	"  (ani-object ANI_STRING)
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50 1 10	"  (ani-properties ANI_X width ANI_Y (- height 5))
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51 1 10	"  (ani-properties ANI_TEXT text)
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52 1 10	"  (ani-time duration)
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53 1 10	"  (ani-properties ANI_X 0))
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55 1 0	"Interpretation: At the bottom of the window, create a horizontal black line and a white
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56 1 0	"rectangle. Using the rectangle as background, make the message move from left to right
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57 1 0	"throughout the presentation.
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59 1 0	"Once defined, this function can be called from any number of animations with different
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60 1 0	"parameters. For example, assuming we have a demo with a window size of 600x500 and a
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61 1 0	"playing time of 2 seconds:
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63 1 10	"(ticker-tape 600 500 2000 "Egon Animation 2.23. No Warranty")
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65 1 0	"Simple, eh?
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67 1 0	"Simple scripts can also be merged into more complex animations, so the above definition
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68 1 0	"can be stored in a separate file ticker.scm and used in other animations. This makes it
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69 1 0	"possible to create a library of reusable animation snippets.
# End of file /home/ulric/siag/pw/examples/egon.pw