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Implement bounding box function for bezier-rs (#726) 

* Implement bounding box function for bezier-rs

* Fix eslint errors

Co-authored-by: Linda Zheng <linda-zheng@users.noreply.github.com>

* Rename bbox to bounding_box

* Address Keavon's comments

* Fix eslint issue

Co-authored-by: Hannah Li <hannahli2010@gmail.com>
Co-authored-by: Linda Zheng <linda-zheng@users.noreply.github.com>
This commit is contained in:
Linda Zheng 2022-07-27 22:27:50 -04:00 committed by Keavon Chambers
parent 4ebdd1abb1
commit c05c93c8a2
3 changed files with 46 additions and 8 deletions
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13
bezier-rs/docs/interactive-docs/src/App.vue
View File

@ -356,6 +356,19 @@ export default defineComponent({
}); });
}, },
}, },
{
name: "Bounding Box",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance): void => {
const context = getContextFromCanvas(canvas);
const bboxPoints: Point[] = JSON.parse(bezier.bounding_box());
const minPoint = bboxPoints[0];
const maxPoint = bboxPoints[1];
drawLine(context, minPoint, { x: minPoint.x, y: maxPoint.y }, COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, minPoint, { x: maxPoint.x, y: minPoint.y }, COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, maxPoint, { x: minPoint.x, y: maxPoint.y }, COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, maxPoint, { x: maxPoint.x, y: minPoint.y }, COLORS.NON_INTERACTIVE.STROKE_1);
},
},
], ],
subpathFeatures: [ subpathFeatures: [
{ {

21
bezier-rs/docs/interactive-docs/wasm/src/lib.rs
View File

@ -128,6 +128,16 @@ impl WasmBezier {
to_js_value(local_extrema) to_js_value(local_extrema)
} }
pub fn de_casteljau_points(&self, t: f64) -> JsValue {
let hull = self
.0
.de_casteljau_points(t)
.iter()
.map(|level| level.iter().map(|&point| Point { x: point.x, y: point.y }).collect::<Vec<Point>>())
.collect::<Vec<Vec<Point>>>();
to_js_value(hull)
}
pub fn rotate(&self, angle: f64) -> WasmBezier { pub fn rotate(&self, angle: f64) -> WasmBezier {
WasmBezier(self.0.rotate(angle)) WasmBezier(self.0.rotate(angle))
} }
@ -142,13 +152,8 @@ impl WasmBezier {
to_js_value(bezier_points) to_js_value(bezier_points)
} }
pub fn de_casteljau_points(&self, t: f64) -> JsValue { pub fn bounding_box(&self) -> JsValue {
let hull = self let bbox_points: [Point; 2] = self.0.bounding_box().map(|p| Point { x: p.x, y: p.y });
.0 to_js_value(bbox_points)
.de_casteljau_points(t)
.iter()
.map(|level| level.iter().map(|&point| Point { x: point.x, y: point.y }).collect::<Vec<Point>>())
.collect::<Vec<Vec<Point>>>();
to_js_value(hull)
} }
} }

20
bezier-rs/lib/src/lib.rs
View File

@ -773,6 +773,26 @@ impl Bezier {
}); });
result result
} }
/// Return the min and max corners that represent the bounding box of the curve.
pub fn bounding_box(&self) -> [DVec2; 2] {
// Start by taking min/max of endpoints.
let mut endpoints_min = self.start.min(self.end);
let mut endpoints_max = self.start.max(self.end);
// Iterate through extrema points.
let extrema = self.local_extrema();
for t_values in extrema {
for t in t_values {
let point = self.evaluate(t);
// Update bounding box if new min/max is found.
endpoints_min = endpoints_min.min(point);
endpoints_max = endpoints_max.max(point);
}
}
[endpoints_min, endpoints_max]
}
} }
#[cfg(test)] #[cfg(test)]