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more example

This commit is contained in:
Adam D. Ruppe 2024-07-30 12:10:47 -04:00
parent a8785995bf
commit 31bd9c1742
1 changed files with 100 additions and 30 deletions
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svg.d
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@ -50,37 +50,9 @@
Example Usage:
---
// Load
NSVG* image = nsvgParseFromFile("test.svg", "px", 96);
printf("size: %f x %f\n", image.width, image.height);
// Use...
image.forEachShape((in ref NSVG.Shape shape) {
if (!shape.visible) return;
shape.forEachPath((in ref NSVG.Path path) {
// this will issue final `LineTo` for closed pathes
path.forEachCommand!true(delegate (NSVG.Command cmd, const(float)[] args) nothrow @trusted @nogc {
final switch (cmd) {
case NSVG.Command.MoveTo: nvg.moveTo(args); break;
case NSVG.Command.LineTo: nvg.lineTo(args); break;
case NSVG.Command.QuadTo: nvg.quadTo(args); break;
case NSVG.Command.BezierTo: nvg.bezierTo(args); break;
}
});
});
});
The easiest way to use it is to rasterize a SVG to a [arsd.color.TrueColorImage], and from there you can work with it
same as any other memory image. For example, to turn a SVG into a png:
NSVGrasterizer rast = nsvgCreateRasterizer();
// Allocate memory for image
ubyte* img = malloc(w*h*4);
// Rasterize
rasterize(rast, image, 0, 0, 1, img, w, h, w*4);
// Delete
image.kill();
---
To turn a SVG into a png:
---
import arsd.svg;
import arsd.png;
@ -107,6 +79,104 @@
}
---
You can also dig into the individual commands of the svg without rasterizing it.
Note that this is fairly complicated - svgs have a lot of settings, and even this
example only does the basics.
---
import core.stdc.stdio;
import core.stdc.stdlib;
import arsd.svg;
import arsd.nanovega;
void main() {
// we'll create a NanoVega window to display the image
int w = 800;
int h = 600;
auto window = new NVGWindow(w, h, "SVG Test");
// Load the file and can look at its info
NSVG* image = nsvgParseFromFile("/home/me/svgs/arsd.svg", "px", 96);
printf("size: %f x %f\n", image.width, image.height);
// and then use the data when the window asks us to redraw
// note that is is far from complete; svgs can have shapes, clips, caps, joins...
// we're only doing the bare minimum here.
window.redrawNVGScene = delegate(nvg) {
// clear the screen with white so we can see the images on top of it
nvg.beginPath();
nvg.fillColor = NVGColor.white;
nvg.rect(0, 0, window.width, window.height);
nvg.fill();
nvg.closePath();
image.forEachShape((in ref NSVG.Shape shape) {
if (!shape.visible) return;
nvg.beginPath();
// load the stroke
nvg.strokeWidth = shape.strokeWidth;
debug import std.stdio;
final switch(shape.stroke.type) {
case NSVG.PaintType.None:
// no stroke
break;
case NSVG.PaintType.Color:
with(shape.stroke)
nvg.strokeColor = NVGColor(r, g, b, a);
debug writefln("%08x", shape.fill.color);
break;
case NSVG.PaintType.LinearGradient:
case NSVG.PaintType.RadialGradient:
// FIXME: set the nvg stroke paint to shape.stroke.gradient
}
// load the fill
final switch(shape.fill.type) {
case NSVG.PaintType.None:
// no fill set
break;
case NSVG.PaintType.Color:
with(shape.fill)
nvg.fillColor = NVGColor(r, g, b, a);
break;
case NSVG.PaintType.LinearGradient:
case NSVG.PaintType.RadialGradient:
// FIXME: set the nvg fill paint to shape.stroke.gradient
}
shape.forEachPath((in ref NSVG.Path path) {
// this will issue final `LineTo` for closed pathes
path.forEachCommand!true(delegate (NSVG.Command cmd, const(float)[] args) nothrow @trusted @nogc {
debug writeln(cmd, args);
final switch (cmd) {
case NSVG.Command.MoveTo: nvg.moveTo(args); break;
case NSVG.Command.LineTo: nvg.lineTo(args); break;
case NSVG.Command.QuadTo: nvg.quadTo(args); break;
case NSVG.Command.BezierTo: nvg.bezierTo(args); break;
}
});
});
nvg.fill();
nvg.stroke();
nvg.closePath();
});
};
window.eventLoop(0);
// Delete the image
image.kill();
}
---
TODO: maybe merge https://github.com/memononen/nanosvg/pull/94 too
*/
module arsd.svg;