CanvasRenderingContext2D in Pascal or C++
lazarus / 39-Graphics

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sarason · 2015-10-17 07:35

I am trying to port a web graphics application back to Lazarus Pascal
and C++ Builder.
It doesn't need any of the alpha channel stuff but it does need
rotations and transforms.
Specifically:

ctx.clearRect
ctx.canvas.width
ctx.canvas.height
ctx.save();   
ctx.transform()
ctx.canvas.height;
ctx.translate()
ctx.restore();
ctx.lineCap
ctx.strokeStyle
ctx.beginPath();
ctx.moveTo(wire.x1, wire.y1);
ctx.lineTo(wire.x2, wire.y2);
ctx.lineWidth = wire.width;
ctx.stroke();
ctx.lineCap = 'round';
ctx.strokeStyle = color;
ctx.beginPath();
ctx.moveTo(wire.x1, wire.y1);
ctx.lineTo(wire.x2, wire.y2);
ctx.lineWidth = wire.width;
ctx.stroke();
ctx.strokeStyle
ctx.beginPath();
ctx.arc();
ctx.lineWidth
ctx.stroke();

Now is there a library available that does this without Java
dependencies?
A code fragment someone has implemented?
A better way ?

regards sarason

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Leledumbo · 2015-10-17 12:34

Quote from: sarason on October 17, 2015, 09:35:06 amNow is there a
library available that does this without Java dependencies?
A code fragment someone has implemented?
A better way ?
LCL, BGRABitmap, anything else with TCanvas descendant or similar
implementation minus the path things.

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Dibo · 2015-10-17 17:05

Quote from: Leledumbo on October 17, 2015, 02:34:06 pmLCL, BGRABitmap,
anything else with TCanvas descendant or similar implementation minus
the path things.
[/quote]
I'll add also AggPas (available from Lazarus -> Package -> Install /
Uninstall -> find package "aggpaslcl"). But AFAIK it has bugs on linux
http://www.crossgl.com/aggpas/aggpas-demo.htm

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circular · 2015-10-22 17:24

BGRABitmap library provides a Canvas2d property which imitates HTML5
functions and syntax

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aradeonas · 2015-10-22 18:10

Get last version of BGRABitmap and compile project in the testcanvas2d
folder and take a look at test number 16 its show you an easy and fast
way to use.