add option to rotate svg and animate the rotation in steps

Makefile

@@ -1,9 +1,9 @@
 inputs = $(wildcard *.svg)
 
-outputs = $(inputs:%.svg=output/%_44100.wav)
-outputs += $(inputs:%.svg=output/%_48000.wav)
-outputs += $(inputs:%.svg=output/%_96000.wav)
-outputs += $(inputs:%.svg=output/%_192000.wav)
+# outputs = $(inputs:%.svg=output/%_44100.wav)
+# outputs += $(inputs:%.svg=output/%_48000.wav)
+# outputs += $(inputs:%.svg=output/%_96000.wav)
+outputs += $(inputs:%.svg=output/%all.wav)
 
 .PHONY: all
 all: output ${outputs}
@@ -23,6 +23,15 @@ output/%_96000.wav: %.svg
 output/%_192000.wav: %.svg
 	./render.py -s 192000 -o $(@:%.svg=%_192000.wav) $<
 
+output/%all.wav: %.svg
+	for number in {000..360..5} ; do \
+	   ./render.py -s 192000 -t 0.1 -o output/$(@F)_$$number.wav -r $$number $< ; \
+	done
+	sox  output/$(@F)_*.wav $@
+	ffmpeg -f concat -safe 0 -i <( for f in output/$(@F)_*.wav; do echo "file '$$(pwd)/$$f'"; done ) output.wav
+	rm output/$(@F)_*.wav
+
+
 .PHONY: clean
 clean:
 	rm -rf output

render.py

@@ -22,11 +22,20 @@
 # ----------------------------------------------------------------------------
 
 import sys
+import math
 import wave
 import argparse
 from svgpathtools import svg2paths
-
-def read_image(filename, path_steps, volume_percent):
+def rot_p(p_center, p,  angle_d):
+    angle = math.radians(angle_d)
+    ox = p_center[0]
+    oy =  p_center[1]
+    qx = ox + math.cos(angle) * (p[0] - ox) - math.sin(angle) * (p[1] - oy)
+    qy = oy + math.sin(angle) * (p[0] - ox) + math.cos(angle) * (p[1] - oy)
+    p = [qx, qy]
+    return p
+
+def read_image(filename, path_steps, volume_percent, angle_d):
     paths, attributes = svg2paths(filename)
     path = paths[0]
     if len(paths) > 1:
@@ -37,15 +46,47 @@ def read_image(filename, path_steps, volume_percent):
     points = [[path[0].start.real, path[0].start.imag]]
     p_min = [points[0][0], points[0][1]]
     p_max = [points[0][0], points[0][1]]
+
+    # find center
+    for segment in path:
+        p = [segment.end.real, segment.end.imag]
+        for i in range(0, 2):
+            if p[i] < p_min[i]:
+                p_min[i] = p[i]
+            if p[i] > p_max[i]:
+                p_max[i] = p[i]
+
+    p_center = [ p_min[0] + (p_max[0] - p_min[0] )/2  ,  p_min[1] + (p_max[1] - p_min[1] )/2]
+
+    # find min max for all rotatations
+    for segment in path:
+        p_org = [segment.end.real, segment.end.imag]
+        for a in range(0, 360, 5):
+            p = rot_p(p_center, p_org , a)
+            for i in range(0, 2):
+                if p[i] < p_min[i]:
+                    p_min[i] = p[i]
+                if p[i] > p_max[i]:
+                    p_max[i] = p[i]
+
+    p = [path[0].start.real, path[0].start.imag]
+    p = rot_p(p_center, p , angle_d)
+    points = [p]
+    # p_min = [points[0][0], points[0][1]]
+    # p_max = [points[0][0], points[0][1]]
     for segment in path:
         p = [segment.end.real, segment.end.imag]
+        p = rot_p(p_center, p , angle_d)
+
         for i in range(0, 2):
             if p[i] < p_min[i]:
                 p_min[i] = p[i]
             if p[i] > p_max[i]:
                 p_max[i] = p[i]
         points.append(p)
+
     print("min={} max={}".format(p_min, p_max))
+    print("center={} ".format(p_center))
 
     data = bytearray()
 
@@ -109,11 +150,13 @@ def main():
                         help="Volume of output file in percent. Defaults to 100%%.")
     parser.add_argument("-i", "--interpolate", dest="interpolate", default=10, type=int,
                         help="Steps on interpolated paths. Defaults to 10.")
+    parser.add_argument("-r", "--rotate", dest="angle_d", default=10, type=int,
+                        help="angle to rotate Defaults to 10.")
 
     args = parser.parse_args()
     print(args)
 
-    wave = read_image(args.input, args.interpolate, args.volume)
+    wave = read_image(args.input, args.interpolate, args.volume, args.angle_d)
 
     samplecount = int(len(wave) / 2 / 2) # stereo, int16
     drawrate = args.samplerate / samplecount