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README.TXT
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Sample: Enhanced Metafile Editor
Summary:
This sample demonstrates the Win32 Enhanced Metafile API
functions.
More Information:
The MFEDIT metafile editor provides the following
functionalities:
Playback and recording of GDI calls
Embedding bitmap and enhanced metafile into another
enhanced metafile with transformation
Hit-testing against enhanced metafile records
Random access playback
Playback metafile records one-by-one
Selective recording of existing enhanced metafile records
into a new enhanced metafile
Drawing with pen, text, bezier, line, ellipse, rectangle
and embedding bitmap and enhanced metafile tools
Playback and Recording of GDI calls
To playback an existing enhanced metafile, choose Load
Metafile from the File menu or click on the Eject button
to bring up the open file dialog and select the
appropriate file. Then click on the Play button to play
it on the drawing surface.
To record, click on the Record button and draw on the
drawing surface with the graphic tools provided. When
done, click on the Stop button.
The GDI calls will be recorded as c:\metafx.emf where x
is 0, 1, 2, 3, etc. If you want to save the metafile
with a different name, choose Record Metafile As from the
File menu.
The new filename will be used as the root for all
metafile recorded; 0, 1, 2, etc will be appended to the
root name.
The default drawing tool is "pen". To select a different
drawing tool, simply click on the desired tool button in
the control panel.
Embedding Bitmap and Enhanced Metafile Into Another Enhanced
Metafile with Transformation
Click the Record button. Select the Bitmap or Metafile
tool and then embed the currently loaded bitmap or
metafile as described in 7 below. When done, click the
Stop button.
Hit-Testing Against Enhanced Metafile Records
Playback an enhanced metafile by clicking on the Playback
button. Then choose Hit Test from the Edit menu. The
cursor will be changed to a cross when the mouse pointer
is over the drawing surface.
Then click on the graphic object played back in the
drawing surface. The editor will search through the
metafile record after record to find the record that
corresponds to the object based on the mouse position.
The search provides a visual cue by changing the graphic
objects to red as it goes until it hits the corresponding
object. If there is a hit, the record number will be
displayed on the control panel, an beep will be heard and
a hit message displayed on the bottom.
When done, uncheck the Hit Test menu item.
Random Access Playback
Click on the number button in the control panel to
playback a particular record. To access a non single
digit record, click on the 10+ button an appropriate
number of times and then the appropriate number button to
bring the sum to the record desired.
Playback Metafile Records One-by-One
Click on the Fast Forward button to play the metafile
record one at a time.
Selective Recording of Existing Enhanced Metafile Records
Into a New Enhanced Metafile
Click on the Record button and the appropriate number
button for playing back selective metafile records in the
drawing surface. The playback records will be recorded
into the new metafile. When done, click on the Stop
button.
Drawing With Pen, Text, Bezier, Line, Ellipse, Rectangle and
Embedding Bitmap and Enhanced Metafile Tools
The default pen is black. To change the pen color,
simply choose the Pen menu item from the Options menu to
select a color.
The default brush used by the Fill Rectangle and Fill
Ellipse routines is black. To change the brush color,
simply choose Brush from the Option menu to select a
color.
The "Text" tool uses the default system font. To change
the font, simply choose Font from the Option menu to
change to a different font and font attributes.
The "Bezier" tool takes four points initially and three
thereafter. To draw a bezier curve, simple select the
"Bezier" tool and click on the drawing surface three or
four times to place the control points.
To embed a currently loaded bitmap, simply select the
"Bitmap" tool and click three points on the drawing
surface to describe the destination of where you would
like the bitmap to go. The editor will do the proper
transform to the bitmap and embed the bitmap to the
drawing.
To load a bitmap, simply choose Load Bitmap from the File
menu and do the selection. The "Bitmap" tool optionally
takes a mask bitmap. The mask bitmap has to be a
monochrome bitmap.
To load a mask bitmap, simply choose Load Mask Bitmap
from the File menu to do the selection. Select a color
bitmap as the mask has the effect of reseting the mask to
none.
To embed a currently loaded enhanced metafile, simply
select the "Embed Enhanced Metafile" tool and click three
points on the drawing surface to describe the destination
of where you would like the enhanced metafile to go. The
editor will do the proper transformation on the metafile
and embed it to the drawing.