Differences

This shows you the differences between two versions of the page.

--- 03_designing_for_3d_printing:02_design_with_svg [2024/10/16 11:47] – [Create a SVG using Python code] jattie
+++ 03_designing_for_3d_printing:02_design_with_svg [2024/10/18 09:39] (current) – [Create a SVG using Python code] jattie
@@ Line 25: / Line 25: @@
 ===== Create a SVG using Python code =====
-The majority of this code was generated in copilot and I played around with the parameters until I managed to get what I wanted to see in the svg.
+The idea was inspired by the [[https://www.printables.com/model/998688-heliochronometer-worlds-most-accurate-sundial|Heliochronometer project on printables]] and discussions with the designer on the faceplates and dual colour designs.
+The majority of the code was generated in copilot and then adjusting the parameters until to get a similar faceplate dial in the svg as can be seen in the original design.
 <WRAP center round info 60%>
-**My initial prompt to copilot was:**
+**My initial prompt to copilot was:**\\
 create python code to generate a 24hour sundial face with roman numerals, hour line, half hour lines, 15 minute and 5 minute lines at varying lengths and produce an svg
@@ Line 116: / Line 118: @@
 This is the SVG file, right click this to download directly for use.
 </WRAP>
+<code python improved_version.py>
+import svgwrite
+import math
+# Create a canvas of 200mm x 200mm
+#conda install dwg = svgwrite.Drawing('circle_with_dividers_and_numerals.svg', profile='tiny', size=('200mm', '200mm'))
+# Create a canvas of 200mm x 200mm with units set to millimeters
+dwg = svgwrite.Drawing('circle_with_dividers_and_numerals.svg', profile='full', size=('200mm', '200mm'), viewBox=('0 0 200 200'))
+# Draw a circle in the middle with a diameter of 140mm and 2mm wide
+circle_center = (100, 100)
+circle_radius = 70
+dwg.add(dwg.circle(center=circle_center, r=circle_radius, stroke='black', fill='none', stroke_width=2))
+# Function to create equal divider lines around the inner circumference of the circle
+def create_divider_lines(dwg, center, radius, num_lines, line_length, line_width):
+    angle_step = 360 / num_lines
+    center_x, center_y = center
+    for i in range(num_lines):
+        angle = math.radians(i * angle_step)
+        start_x = center_x + (radius - line_width / 2) * math.cos(angle)
+        start_y = center_y + (radius - line_width / 2) * math.sin(angle)
+        end_x = center_x + (radius - line_width / 2 - line_length) * math.cos(angle)
+        end_y = center_y + (radius - line_width / 2 - line_length) * math.sin(angle)
+        dwg.add(dwg.line(start=(start_x, start_y), end=(end_x, end_y), stroke='black', stroke_width=line_width))
+# Function to add Roman numerals around the outer circumference of the circle
+def add_roman_numerals(dwg, center, radius, num_numerals):
+    roman_numerals = ["I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX", "X", "XI", "XII"]
+    roman_numerals = roman_numerals*2
+    angle_step = 360 / num_numerals
+    center_x, center_y = center
+    for i in range(num_numerals):
+        angle = math.radians(i * angle_step - 90)  # Adjust angle to start from the top
+        text_x = center_x + radius * math.cos(angle)
+        text_y = center_y + radius * math.sin(angle)
+        #dwg.add(dwg.text(roman_numerals[i % len(roman_numerals)], insert=(text_x, text_y + 3), text_anchor="middle", font_size="10pt"))
+        rotation_angle = i * angle_step
+        dwg.add(dwg.text(roman_numerals[i % 24], insert=(text_x, text_y + 0), text_anchor="middle", font_size="8pt",
+                         transform=f"rotate({rotation_angle} {text_x},{text_y + 0})"))
+# Use the function to create 24 divider lines of 18mm long and 1mm wide
+create_divider_lines(dwg, circle_center, circle_radius, 24, 10, 0.8)
+create_divider_lines(dwg, circle_center, circle_radius, 24*2, 7, 0.8)
+create_divider_lines(dwg, circle_center, circle_radius, 24*4, 6, 0.4)
+create_divider_lines(dwg, circle_center, circle_radius, 24*12, 4, 0.4)
+# Add one set of Roman numerals around the outer circumference of the circle
+add_roman_numerals(dwg, circle_center, circle_radius + 3, 24)
+# Save the SVG file
+dwg.save(pretty=True, indent=2)
+print("SVG saved: 'circle_with_dividers_and_numerals.svg'")
+</code>
 ===== How to use the SVG in Fusion360 =====
 <WRAP center round todo 60%>
-Coming soon
+At the moment there is some fusion specific issue encountered importing the python generated SVG. It seems related to scaling and coordinate calculations. I suspect them to also be related to radians.
 </WRAP>
+{{:03_designing_for_3d_printing:screenshot_2024-10-17_091637.png?nolink|}}