[repo.or.cz] gfxprim.git branch master updated: e5413bf88214d6a7a13b0ad251befe8098a5e387

12 Jan 2013

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http://repo.or.cz/w/gfxprim.git/commit/e5413bf88214d6a7a13b0ad251befe8098a5e...

commit e5413bf88214d6a7a13b0ad251befe8098a5e387
Author: Cyril Hrubis <metan@ucw.cz>
Date:   Fri Jan 11 15:11:02 2013 +0100

    doc: Edhance coordinate system description.

diff --git a/doc/coordinate_system.txt b/doc/coordinate_system.txt
index fb3f408..7ef9081 100644
--- a/doc/coordinate_system.txt
+++ b/doc/coordinate_system.txt
@@ -1,11 +1,30 @@
 Coordinate System
 -----------------
 
-GFXprim uses Cartesian coordinate system. The pixel +(0, 0)+ lies at the upper
+Coordinates
+~~~~~~~~~~~
+
+GFXprim uses Cartesian coordinate system. The pixel '(0, 0)' lies at the upper
 left corner of the bitmap and coordinates grows to the right and to the
-bottom. The last valid pixel, that still lies in the bitmap of size +w+ and
-+h+, occupies coordinates +(w - 1, h - 1)+. The precise position of the point
-with integer coordinates is in the middle of the pixel (and borders between
-the pixels lies are integers + 0.5).
+bottom. The last valid pixel, that still lies in the bitmap of size 'w' and
+'h', occupies coordinate '(w-1,h-1)'. The precise position of the point with
+integer coordinates is in the middle of the pixel (and borders between the
+pixels lies are integers + 0.5).
+
+[[Coordinates]]
+.GFXprim coordinate system and GP_LineXYXY(5, 3, 9, 3)
+image::coordinates-1.svg["Coordinate system"]
+
+Width and Height
+~~~~~~~~~~~~~~~~
+
+The width and height, when passed as an argument, are interpreted as number of
+pixels to draw (rather than lengt from one pixel center to another pixel
+center). Which means that for rectangle of size '(w,h)' starting at '(x,y)'
+first pixel to draw would be '(x,y)' and last one would be '(x+w-1,y+h-1)'.
+Especially when 'w' or 'h' is less than or equal to zero no action is taken.
+
+[[Coordinates_Rectangle]]
+.GP_RectangleXYWH(2, 1, 8, 4)
+image::coordinates-2.svg["Coordinates Rectangle"]
 
-image:coordinates-1.svg[Coordinate System]
diff --git a/doc/coordinates-1.svg b/doc/coordinates-1.svg
index 841444d..427b812 100644
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diff --git a/doc/coordinates-2.svg b/doc/coordinates-2.svg
new file mode 100644
index 0000000..ffa02d7
--- /dev/null
+++ b/doc/coordinates-2.svg
@@ -0,0 +1,308 @@
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+
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diff --git a/doc/coordinates.mp b/doc/coordinates.mp
index 404ff70..c048e6e 100644
--- a/doc/coordinates.mp
+++ b/doc/coordinates.mp
@@ -1,14 +1,5 @@
-%
-% Compile to svg by:
-%
-% mptopdf coordinates.mp; inkscape -l coordinates-1.svg coordinates-1.pdf
-%
-beginfig(1)
+def draw_grid = 
 	% Draw grid
-	u := 48;
-	w := 9;
-	h := 7;
-
 	for i=0 upto h:
 		draw (0, i * u) -- (w * u, i * u);
 	endfor
@@ -29,12 +20,62 @@ beginfig(1)
 	draw A -- B withpen pencircle scaled 2;
 	draw B -- C withpen pencircle scaled 2;
 	drawarrow D -- C withpen pencircle scaled 4;
+enddef;
+
+vardef pixel_coord(expr x, y) = 
+	px := u/2 + x * u;
+	py := h * u - u/2 - u * y;
+	(px,py)
+enddef;
+
+def fill_pixel(expr x, y, col) =
+	fill unitsquare scaled u shifted pixel_coord(x - 0.5, y + 0.5) withcolor col
+enddef;
+
+beginfig(1)
+	u = 48;
+	w = 11;
+	h = 6;
+	
+	% Draw labels
+	dotlabel.top(btex (0, 0) etex, pixel_coord(0, 0));
+	dotlabel.top(btex (w-1, h-1) etex, pixel_coord(w-1, h-1));
+	dotlabel.urt(btex (1.5, 2) etex, pixel_coord(1.5, 2));
+	
+	% Draw line
+	lxs = 5;
+	lxe = 9;
+	ly = 3;
 
+	for i = lxs upto lxe:
+		fill_pixel(i, ly, (0.6, 0.6, 1));
+	endfor
+
+	dotlabel.top(btex (5, 3) etex, pixel_coord(lxs, ly));
+	dotlabel.top(btex (9, 3) etex, pixel_coord(lxe, ly));
+	
+	draw_grid;
+endfig;
+
+beginfig(2)
+	u := 48;
+	w := 11;
+	h := 6;
+	
 	% Draw labels
-	dotlabel.top(btex (0, 0) etex, (u/2, h * u - u/2));
-	dotlabel.top(btex (w-1, h-1) etex, (w * u - u/2, u/2));
+	dotlabel.top(btex (0, 0) etex, pixel_coord(0, 0));
 	
-	dotlabel.urt(btex (1.5, 2) etex, (2 * u, h * u - 2 * u - u/2));
+	for i = 2 upto 9:
+		for j = 1 upto 4:
+			fill_pixel(i, j, (0.6, 1, 0.6));
+		endfor
+	endfor
 
+	% Draw rectangle
+	dotlabel.top(btex (2, 1) etex, pixel_coord(2, 1));
+	dotlabel.top(btex (9, 4) etex, pixel_coord(9, 4));
+
+	draw_grid;
 endfig;
+
 end
diff --git a/doc/gen_mp.sh b/doc/gen_mp.sh
new file mode 100755
index 0000000..27c622c
--- /dev/null
+++ b/doc/gen_mp.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# Script to regenerate svgs from metapost
+#
+# The resulting svg images are stored in git so you need
+# to run the script only after you changed the metapost
+# source files.
+#
+
+SRC=coordinates
+
+echo "$SRC.mp -> $SRC-*.pdf"
+mptopdf "$SRC.mp"
+
+for i in $SRC*.pdf; do
+	SVG=`echo "$i" | sed s/.pdf/.svg/`
+	echo "$i -> $SVG" 
+	inkscape -l "$SVG" "$i"
+	rm "$i"
+done

-----------------------------------------------------------------------

Summary of changes:
 doc/coordinate_system.txt |   31 ++++-
 doc/coordinates-1.svg     |  320 ++++++++++++++++++++++++++-------------------
 doc/coordinates-2.svg     |  308 +++++++++++++++++++++++++++++++++++++++++++
 doc/coordinates.mp        |   67 ++++++++--
 doc/gen_mp.sh             |   20 +++
 5 files changed, 594 insertions(+), 152 deletions(-)
 create mode 100644 doc/coordinates-2.svg
 create mode 100755 doc/gen_mp.sh


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