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# Category Archives: Drawing

## DigitGraph Spreadsheet and WebPlot Digitiser

I have posted here previously a spreadsheet that allows XY data to be extracted from images of graphs, maps or other images of objects in a single plane: How to digitise a scanned image. I have updated the instructions for the … Continue reading

Posted in Charts, Charts, Computing - general, Curve fitting, Drawing, Excel, UDFs, VBA
Tagged DigitGraph, digitize scanned image, Excel, UDF, VBA, WebPlot Digitizer
5 Comments

## Plotting Mandelbrot

There are many sites discussing the Mandelbrot Set, but not many examples using VBA to plot the set in Excel, so here is my effort: The spreadsheet (including open source VBA code) may be downloaded from: Mandelbrot chart.zip Note that … Continue reading

Posted in Charts, Charts, Coordinate Geometry, Drawing, Excel, Maths, Newton, VBA
Tagged Charts, Excel, Mandelbrot Set, VBA
3 Comments

## Arcs and arc-splines

I have added two user defined functions (UDFs) to the IP2 spreadsheet to generate coordinates for a single arc, or a series of arcs connected (if necessary) by straight lines. The new version may be downloaded from: IP2.zip As an example … Continue reading

## More Python rotation functions

The code described in the previous post includes a Python function that rotates 3D coordinates by an angle defined with two vectors, using Rodrigue’s Rotation. I have now added this function to the IP2_py spreadsheet, where it is used in the … Continue reading

Posted in Coordinate Geometry, Drawing, Excel, Link to Python, Maths, Newton, NumPy and SciPy, UDFs, VBA, xlwings
Tagged Excel, fit 3D circle, Numpy, Python, RPView, UDF, VBA, xlwings, xl_RPView
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## Use Matplotlib from Excel with xlwings

Xlwings is another free and open source package allowing communication between Excel and Python. It now incorporates ExcelPython, and is included in the Anaconda Python package, so will support my ExcelPython based spreadsheets after installation of xlwings using: conda install … Continue reading

Posted in Drawing, Excel, Link to Python, Maths, Newton, Numerical integration, NumPy and SciPy, VBA
Tagged Excel, ExcelPython, link Excel to Python, MatPlotlib, Python, VBA, xlwings
8 Comments

## Section Properties – Lunes and Groups

Following a discussion at Eng-Tips and resulting comments I have updated my Section Properties spreadsheet to include calculation of the area and centroid of a “Lune” (the shape of a crescent moon). I have also added a “Re-draw Shape” button because … Continue reading

Posted in Drawing, Excel, Maths, Newton, VBA
Tagged Excel, group properties, Lune, section properties, VBA
2 Comments

## “Yields circularity when preceded by its quotation” …

yields circularity when preceded by its quotation. Today’s post takes us on a little circular tour of the internet, starting with: Grumpy Old Programmer (Mike Woodhouse) who returns from a long holiday from blogging to publish a nice little routine … Continue reading

Posted in Computing - general, Drawing, Newton
Tagged Computer Quine, Douglas Hofstadter, Golfed code, Illusion, MU, Quine
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