ruby-****@sourc*****
ruby-****@sourc*****
2013年 3月 26日 (火) 01:53:39 JST
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REMOTE_ADDR = 70.49.48.128
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/hiki.cgi?tut-gtk2-dancr-rbcatut
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@@ -326,7 +326,11 @@
Another thing to be aware of when modifying scale is the line thickness. Namely, it too is affected when switching between single digit scale settings to settings in hundreds of pixels. This may become very confusing if one is not careful, particularly when your line thickness becomes larger than your object or a geometric shape you are drawing.
- For your convenience I also include an example using the default scale, i.e.:((*scale(1,1)*)) and pixels as x,y coordinates used in arguments to shape drawing methods:
+ :Default Scale Example
+ (12.3.1.2.1.B1){{br}}
+ {{image_left("1203-p04-scale_1,1-rect_0,0,50,50-in-drwArea-w-rulers-line-colors-c-s1")}}
+
+ For your convenience I also include an example using the default scale, i.e.:((*scale(1,1)*)) and pixels as x,y coordinates used in arguments to shape drawing methods. I also included the image collage, showing three different aspects of the graphics presentation. The first is the usual top Wtk window. For the second and the third, which are the images of the entire cairo drawing area, and the image only of the cr.rectangle(0, 0, 50, 50) respectively, I use GIMP graphic editor with rulers, to enlarge the relevant parts of drawing area and more clearly expose the sizes of both items. I intentionally changed Michael's rectangle's coordinates x1, y1 from (0.25, 0.25) to (0, 0), so the 0.5x0.5 square (now in pixels (50x50) is drawn directly from the 'centre' of the graphics coordinate system (in which, as you know the positive x axis runs from the top left corner of the drawing area to the right, and the positive y coordinate runs down along the left.) If you look carefu
lly, you will see, that the line thickness along x,y axis is only 1/2 of the true size (at the right and at the bottom sides of the square.) I changed the colour of the line from black (0, 0, 0) to pinkish (0.5, 0, 0).
{{image_right("1203-p04-scale_1,1-rect_0,0,50,50-collage.png")}}