add clipping

II/Referatas/layer2img.py

@@ -29,9 +29,23 @@ def parse_args():
     parser.add_argument('-o', '--outfile', metavar='<file>', type=str)
     parser.add_argument(
             '--size', type=plt_size, help='Figure size in mm (WWxHH)')
+    parser.add_argument(
+            '--clip', type=float, nargs=4,
+            metavar=('xmin', 'ymin', 'xmax', 'ymax'))
     return parser.parse_args()
 
 
+#def makebox(t):
+#    xmin, ymin, xmax, ymax = t
+#    if xmin > xmax:
+#        raise Exception("xmin should be > xmax")
+#    if ymin > ymax:
+#        raise Exception("ymin should be > ymax")
+#    left, bottom = xmin, ymin
+#    width, height = xmax - xmin, ymax - ymin
+#    return {'left': left, 'bottom': bottom, 'width': width, 'height': height}
+
+
 def main():
     args = parse_args()
     if args.table:
@@ -41,8 +55,12 @@ def main():
     else:
         f = geopandas.read_file(args.infile)
     f.plot(figsize=args.size)
-    plt.axis('off')
+    ax = plt.gca()
-    plt.margins(0, 0)
+    if args.clip:
+        ax.set_ylim(bottom=args.clip[1], top=args.clip[3])
+        ax.set_xlim(left=args.clip[0], right=args.clip[2])
+    ax.axis('off')
+    ax.margins(0, 0)
     plt.tight_layout(0)
     if args.outfile:
         plt.savefig(args.outfile, bbox_inches=0, dpi=300)

II/Referatas/mj-referatas.tex

@@ -46,6 +46,12 @@ a6: 105x148xmm
 a7: 74x105mm
 a8: 52x74mm
 
+Xmin: 623306.313
+Ymin: 6109635.515
+Xmax: 625526.313
+Ymax: 6111210.515
+623306.313 6109635.515 625526.313 6111210.515
+
 connect rivers first to a single polylines:
 - some algs can preserve connectivity, some not.
 
@@ -136,14 +142,18 @@ are often used for line generalization:
 
 Review of the available algorithms will be followed by desiderata for a
 possible open-source addition. In the end, we will issue a recommendation,
-which algorithm can be picked up and implemented by a willing GIS developer.
+which algorithm can be picked up and implemented by an avid GIS developer.
 
 \section{Visual comparison}
 
 Lakaja and large part of Žeimena (see figure~\ref{fig:zeimena} on
-page~\pageref{fig:zeimena}) will be used, because the river exhibits both both
+page~\pageref{fig:zeimena}) will be used as inputs to the generalization
-straight and curved shape, is a combination of two curly rivers, and author's
+algorithms, because the river exhibits both both straight and curved shape, is
-familiarity with the location.
+a combination of two curly rivers, and author's familiarity with the location.
+
+Since the map area is large (scale $1:150 000$), we will also review a
+zoomed-in subset of the map of scale $1:10 000$. The zoomed-in version will
+help explain some of the deficiencies in the reviewed algorithms.
 
 \begin{figure}[H]
     \centering