drawArc about dart_pdf HOT 6 CLOSED

I think you should be able to create the drawArc() function from the drawEllipsis() content. To draw the ellipsis, I draw 4 cubic bézier curves. If you create a new function that draws only one, that should do the trick.

Or directly expose a bézier curve function in graphics.dart:

void curveTo(double x1, double y1, double x2, double y2, double x3, double y3) {
    buf.putString("$x1 $y1 $x2 $y2 $x3 $y3 c\n");
  }

Such curves are defined by four points: the current point (use moveTo()), the final point (x3, y3), and two control points (x1, y1) and (x2, y2).
https://en.wikipedia.org/wiki/B%C3%A9zier_curve

From that, you can find how to create an arc on the Internet.

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Dave,

Your response is much appreciated. Now I have multiple options: generate pdf, generate png from screen. Will try to use both. Many thanks.

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If you manage to create the function or some others, don't hesitate to create a pull request. I will be happy to get contributions.

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I don't know if there is a widget to scroll in both directions.

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@biancashouse I have been 'playing around' with a high level wrapper for Dave's PDF library here. I use a Flutter plugin to view the generated PDF flutter_full_pdf_viewer. It does not scroll in both directions but it will allow pinch and zoom of each page of the viewer (just take a look at the example project)

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