add map to grid script

README.md

@@ -49,6 +49,8 @@ Plotting a map on an A3 piece of paper.
 
 ![Image of a plotter plotting a map](images/plotting_image.png)
 
+If you want to plot the map on mulitple piece of papers, you can use the `map_to_grid.sh` script.
+
 A similar, cool project with a different UX and output is: https://github.com/anvaka/city-roads/ and another project to visualize maps in a custom way (also for plotters) is: https://github.com/marceloprates/prettymaps
 
 ## Contributing

map_to_grid.sh

@@ -0,0 +1,15 @@
+INPUT=$1
+OUTPUT=out
+GRID_X_COUNT=3
+GRID_Y_COUNT=3
+GRID_X_LENGTH_MM=100
+GRID_Y_LENGTH_MM=100
+
+for i in $(seq 1 $GRID_X_COUNT); do
+  for j in $(seq 1 $GRID_Y_COUNT); do
+    start_crop_x=$(bc -l <<< "a=$i-1; a*$GRID_X_LENGTH_MM");
+    start_crop_y=$(bc -l <<< "a=$j-1; a*$GRID_Y_LENGTH_MM");
+    vpype read ${INPUT} crop ${start_crop_x}mm ${start_crop_y}mm ${GRID_X_LENGTH_MM}mm ${GRID_Y_LENGTH_MM}mm write --page-size ${GRID_X_LENGTH}x${GRID_Y_LENGTH}mm --center ${OUTPUT}_${i}_${j}.svg;
+    echo "${OUTPUT}_${i}_${j}.svg"
+  done;
+done;