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aiongg
6c9709e11f
A stop can name a colour swatch (spot, process, tint, [Paper]) next to its
display colour. swatch.create {gradient}, object.gradient, the Gradient panel
and IDML StopColor keep the reference; renames follow it, swatch edits refresh
the stop's colour and a deleted swatch leaves a plain colour. The field is
optional and omitted for plain stops, so saved documents load and save as
before.
37 lines
1.8 KiB
Rust
37 lines
1.8 KiB
Rust
//! A gradient between process colours shows the inks' blend, as InDesign shows it.
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use designcraft_color::swatch::Swatch;
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use designcraft_color::{Color, Gradient, GradientKind, GradientStop, SwatchValue};
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use designcraft_compose::Cache;
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use designcraft_doc::build::NewDocument;
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use designcraft_doc::{Document, Fill, Item, ItemId, Shape, SpreadRef, Stroke};
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use designcraft_geom::{Affine, Rect, shapes};
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use designcraft_render::{Placed, RenderOptions, Renderer};
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#[test]
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fn a_cmyk_gradient_is_c50_m50_halfway() {
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let mut d = Document::new(&NewDocument { width: 100.0, height: 20.0, facing_pages: false, ..Default::default() });
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let stop = |offset: f32, color: Color| GradientStop::new(offset, color);
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let gradient =
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Gradient { kind: GradientKind::Linear, stops: vec![stop(0.0, Color::cmyk(0.0, 1.0, 0.0, 0.0)), stop(1.0, Color::cmyk(1.0, 0.0, 0.0, 0.0))] };
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d.swatches.push(Swatch { name: "Magenta to Cyan".into(), value: SwatchValue::Gradient { gradient }, locked: false, named: true, hidden: false });
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let id = ItemId(d.alloc());
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let mut item = Item::new(id, d.default_layer(), Shape::Rectangle, shapes::rectangle(Rect::new(0.0, 0.0, 100.0, 20.0)));
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item.fill = Fill::swatch("Magenta to Cyan");
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item.stroke = Stroke::default();
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d.insert_item(SpreadRef::Doc(0), item, None).unwrap();
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let img = Renderer::new().render(
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&d,
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&Cache::new(),
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&[Placed { spread: SpreadRef::Doc(0), xf: Affine::IDENTITY }],
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100,
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20,
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Affine::IDENTITY,
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&RenderOptions { paper: false, background: Some([255; 4]), ..Default::default() },
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);
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let want = Color::cmyk(0.5, 0.5, 0.0, 0.0).to_rgba8(1.0);
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let got = img.pixel(50, 10);
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for ch in 0..3 {
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assert!(got[ch].abs_diff(want[ch]) <= 4, "halfway {got:?}, the inks' blend is {want:?}");
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}
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}
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