Origin of SVG Circle Stroke

Describing my current issue is proving to be challenging, but I'll do my best:

My project involves creating an SVG circle progress bar and fortunately, I came across a great example that aligns with what I aim to achieve. I prefer not to use any third-party libraries such as snap for this task.

Here's the example I found on CodePen

The main hurdle I'm facing revolves around altering the origin of the stroke in the design. Upon testing the progress bar from the example link, you'll notice that the stroke originates from the right side. However, I need it to start from the top instead.

Being a developer myself, I attempted to resolve this challenge independently but alas, I couldn't quite crack the code. Adjusting the stroke-dasharray attribute only led to inconsistencies between the stroke width and the percentage set in stroke-dashoffset.

I comprehend that resolving this issue boils down to mathematical calculations involving the stroke-dasharray value, but I'm struggling to decipher the exact steps to take.

The dashoffset calculation formula currently stands as follows:

var pct = ((100-val)/100)*(Math.PI*(r*2));

There must exist a connection between this formula and the default dasharray value of 565.48, although no explicit reference has been provided anywhere.

Answer №2

In response to your recent question:

It's interesting how the standard dasharray value of 565.48 correlates with certain mathematical calculations.

By using the formula π(r*2) or 2πr, one can determine the circumference of a circle and subsequently find the appropriate value for the dash-array needed to complete the circle.

For instance:

If the radius of your SVG circle is 90 units...

2π(90) = 565.48, indicating that the dash-array should be set to 565.48.

Alternatively, with a radius of 45 units...

2π(45) = 282.74, resulting in a dash-array value of 282.74.

Answer №3

Another way to achieve a 270 degree rotation:

transformation="matrix(0,-1,1,0,0,200)"

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