USING SMILE: THE APPLESCRIPT INTEGRATED PRODUCTION ENVIRONMENT in Objective-C

Drawer QR Code in Objective-C USING SMILE: THE APPLESCRIPT INTEGRATED PRODUCTION ENVIRONMENT

CHAPTER 28 USING SMILE: THE APPLESCRIPT INTEGRATED PRODUCTION ENVIRONMENT
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Let s get some information about that object class. Select graphic window, and press Cmd+ Shift+F; this displays the entry for the graphic window class. For this project, you ll focus only on two properties: back pdf and front pdf; those are where the graphic window stores PDF data. Here is an excerpt of Smile s dictionary describing the class graphic window: Class graphic window : (inherits from window) a window where you can draw pictures of various kinds by script, and that you can save as a PDF file or as a tiff file. Plural form: graphic windows Properties: frame a list of small real -- {x origin, y origin, width, height} [...] [...] back pdf string -- The PDF data for the background of the window. Can be set to a file, to some Graphic Kernel output or to raw PDF data as string. front pdf string -- The PDF data drawn after the background and the graphic views of the window. Can be set to a file, to some Graphic Kernel output or to raw PDF data as string. Making a PDF drawing consists of filling the back pdf and/or the front pdf fields of a new graphic window with PDF data (a string, actually). Here is an excerpt of the PDF data in the file you just opened: %PDF-1.3 % 2 0 obj << /Length 1 0 R /Filter /FlateDecode >> stream x +T_T(_c} \C_ |d _ _ endstream [...] x k"- m& : I r wr , O _KI*)WM _..._ H_ _> ^k_ ~ *K[__l [...] As you can see, PDF is not as intuitive as AppleScript. Thus, you will not make PDF data directly; rather, Smile s graphic library will. You will use natural commands such as MoveTo, LineTo, and DrawString, and Smile s graphic library will turn them into regular PDF data. When you program the graphic library, you will find the documentation useful, which is available in four forms: The hypertext documentation for all commands is available via the Help menu. A PDF document is included in the download Smile Scripted graphics (and includes guide and reference). A chapter in the online documentation is available from Smile s home page (and includes guide and reference). A drawing palette, available from the Window menu, displays each graphical command as a button. To display the description for a given command in the (resizeable) Message floating window, place the mouse over the button. To insert a command in the frontmost window, click the button.
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Note
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To enjoy the tutorial, you do not have to use the documentation. I merely mention it for further reading.
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CHAPTER 28 USING SMILE: THE APPLESCRIPT INTEGRATED PRODUCTION ENVIRONMENT
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To have Smile generate the PDF and provide it to the back pdf property of a given graphic window, w, your script proceeds in three steps. First, you initiate the PDF with BeginFigure(w), and second, you include the graphic commands specific to your graphic. Finally, you close the PDF with EndFigure(). This is the instruction that will notify Smile to compile the graphic commands into PDF data and to load the PDF data into the back pdf field of w so the window will display your graphic. When you open the PDF file mc0306.pdf, Smile loads the PDF into back pdf. You do not want to replace the original graphic; rather, you want to superimpose a new graphic. Here you have to use the foreground layer the front pdf field of the window. The instructions are the same as for drawing in the background layer, except you must call BeginFrontFigure() and EndFrontFigure() instead of BeginFigure() and EndFigure(). Let s try it by drawing a line from one corner to the other, over the opened PDF. Here you ll use basic graphic commands: MoveTo and LineTo. Both want a point as their argument, the list {x, y} of two numbers (MoveTo moves the pen without drawing; LineTo defines a line starting from the current pen location). The scale is 1 pixel (1 pixel = 1/72 inch 0.35 mm). x/y coordinates increase rightward/upward. BeginFrontFigure(w) MoveTo({0, 0}) LineTo({600, 840}) Endfrontfigure() draw w As usual, select the text, and press Return . . . ouch! Nothing happens. This is because the program does not draw! All it does is define a shape (a path) here, the diagonal line. After having defined a path, you then have to draw it in a separate operation, which is why you use DrawPath. The parameter of DrawPath will specify whether to draw the stroke of the path, will specify whether to fill the path (which makes little sense for this line, of course), and will propose more options such as using the path, not to draw but as a mask. The most often used values are DrawPath("fill-stroke"), which draws the stroke and fills the path; DrawPath("fill"); and DrawPath("stroke"). Usually, before firing a DrawPath command, you specify the pen and fill settings you want it to use. Here you ll use the default settings: by default the pen and the fill colors are black, and the pen size is 1 pixel: BeginFrontFigure(w) MoveTo({0, 0}) LineTo({600, 840}) DrawPath("stroke") -- or: 2 EndFrontFigure() draw w Select the text, and then press Return you ll notice that a slash has been drawn on the page, as shown in Figure 28-7.
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