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- Importing Windows Metafiles.
-
- WinRIP Lite provides a facility which allows images in the form of a Windows
- Metafile to be imported into the current editing window and converted to RIP
- format. This is obviously a very powerful tool to aid you in producing high
- quality images.
-
- Before we get started on explaining how to go about import metafiles, there
- are a few points of which you should be aware.
-
- Metafiles are made up of Windows GDI drawing commands and mainly consist of
- Polygons, PolyPolygons and PolyLines. PolyPolygons and PolyLines are unknown
- in RIP, a PolyPolygon is a single GDI drawing command containing several
- individual polygons, a PolyLine is also a single drawing command, but
- containing several lines. Also, one problem with RIP is the restriction that a
- polygon may only contain a maximum of 512 points, whereas a polygon GDI
- command may contain thousands of points.
-
- Obviously, WinRIP Lite has to provide a means of handling the PolyPolygon and
- PolyLine GDI command conversions. This it does in the following way. A
- PolyPolygon is actually output as a series of individual 'Polygons' in RIP
- format, and PolyLines as individual 'Lines'. Nothing spectacular in this you
- might say, but be warned, this has side effects! A PolyLine contains a series
- of points each of which is connected together, as an example take the
- following set of points to be the coordinates in a Polyline GDI command:-
-
- {(0, 1)(2, 5)(20, 15)(27, 4)(30, 4)}
-
- Now this set of points consists of 5 individual point in PolyLine format, but
- consider what happens when this is converted to RIP:
-
- !|L00010205|L02052015|L20152704|L27043004
-
- NOTE: The individual points have not been converted to Mega Number format to
- aid clarity.
-
- You get four individual line drawing command in RIP format, each consisting of
- 10 characters (including the '|' character). The start point of the next
- command is the same as the last point of the previous command. in other words
- each point, except the very first and very last is specified TWICE.
-
- RIP only allows for a maximum of 512 points to be specified in a Polygon, so
- how does WinRIP Lite cope with the situation where there are more than 512
- points in a GDI Polygon metafile command. Simple, WinRIP Lite converts the
- polygon to a set of individual 'Line' commands along the same lines as the
- example given above and adds an additional line command at the end of the
- sequence to ensure that the polygon is 'closed, that is, that the last point
- in the polygon is connected to the first.
-
- Now you can see the potential danger... You can end up with a VERY large RIP
- file. You are therefore advised to keep the number of imported metafiles per
- RIP image to a minimum. You can see the effect of the conversion of two
- metafiles by examining the file 'CHAPLIN.RIP' (included with WinRIP Lite).
- This files contains to elements converted from Windows metafiles, the drawing
- of Charlie Chaplin and the name WinRIP. Only the text "Charlie Chaplin brought
- to you by" was actually entered in WinRIP. The file is almost 21k!
-
-
- How to Import a Metafile.
-
- From the pull down File menu click 'Import Image', you will be presented with
- a 'File Open' dialog box containing a 'Directory List Box' and 'File List Box'
- etc., from which you can select the file to be imported. Once you have
- selected the file, the image will be displayed in the top left hand corner of
- the screen together with a 'bounding box'. Note that the imported image may be
- larger than the window. You will notice that a window is displayed containing
- eight 'Radio Buttons'. Against each of these button is a scaling factor
- allowing the imported image to be scaled by:
-
- 25%
- 50%
- 75%
- 100%
- 150%
- 200%
- 250%
- 300%
-
- Select the scaling factor by clicking the appropriate radio button. This does
- not immediately effect the displayed image, but the bounding box will change
- size according to the scale factor selected. All scale factors are applied to
- the size of the original image, i.e. scaling the image by 150% will scale the
- image to 1.5 times it's original size, now if a further scaling factor is
- selected that will be applied to the size of the ORIGNAL image. To accept the
- new image size as defined by the bounding box, click the OK button.
-
- The bounding box may now be dragged to position where the image is to be
- pasted. To actually paste the image, click the right hand mouse button.
-
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