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Bezier-rs: continue converting demos from canvas to SVG (#779)

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* Convert constructor to use svg

* Convert the through_points functions to svg

* Convert length, lut, derivative, and tangent from canvas to svg

* Fixed bug when t1 == t2 in split

* Converted split and trim to use svg representation, and swapped slider options default to use quadratic options

* Convert normal and curvature to use svg representation in bezier-rs-demos

* Convert the project function to use svg representation in bezier-rs-demos

* Convert the local_extrema, bbox, and inflections to use svgs

* Add text offset constants

* Fix typo

Co-authored-by: Robert Nadal <Robnadal44@gmail.com>
Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Hannah Li 2022-09-27 17:37:30 -07:00 • committed by Keavon Chambers
parent e9cd792635
commit 55f6d13daf
8 changed files with 358 additions and 243 deletions
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11
libraries/bezier-rs/src/bezier/transform.rs
View file

@ -1,4 +1,5 @@
use super::*;
use crate::utils::f64_compare;
use glam::DMat2;
use std::f64::consts::PI;
@ -41,12 +42,20 @@ impl Bezier {
/// Returns the Bezier curve representing the sub-curve starting at the point corresponding to `t1` and ending at the point corresponding to `t2`.
pub fn trim(&self, t1: f64, t2: f64) -> Bezier {
if f64_compare(t1, t2, MAX_ABSOLUTE_DIFFERENCE) {
let point = self.evaluate(t1);
return match self.handles {
BezierHandles::Linear => Bezier::from_linear_dvec2(point, point),
BezierHandles::Quadratic { handle: _ } => Bezier::from_quadratic_dvec2(point, point, point),
BezierHandles::Cubic { handle_start: _, handle_end: _ } => Bezier::from_cubic_dvec2(point, point, point, point),
};
}
// Depending on the order of `t1` and `t2`, determine which half of the split we need to keep
let t1_split_side = if t1 <= t2 { 1 } else { 0 };
let t2_split_side = if t1 <= t2 { 0 } else { 1 };
let bezier_starting_at_t1 = self.split(t1)[t1_split_side];
// Adjust the ratio `t2` to its corresponding value on the new curve that was split on `t1`
let adjusted_t2 = if t1 < t2 || (t1 == t2 && t1 == 0.) {
let adjusted_t2 = if t1 < t2 || t1 == 0. {
// Case where we took the split from t1 to the end
// Also cover the `t1` == t2 case where there would otherwise be a divide by 0
(t2 - t1) / (1. - t1)

313
website/other/bezier-rs-demos/src/App.vue
View file

@ -4,7 +4,7 @@
<p>This is the interactive documentation for the <b>bezier-rs</b> library. Click and drag on the endpoints of the example curves to visualize the various Bezier utilities and functions.</p>
<h2>Beziers</h2>
<div v-for="(feature, index) in bezierFeatures" :key="index">
<BezierExamplePane :name="feature.name" :callback="feature.callback" :exampleOptions="feature.exampleOptions" />
<BezierExamplePane :name="feature.name" :callback="feature.callback" :exampleOptions="feature.exampleOptions" :triggerOnMouseMove="feature.triggerOnMouseMove" />
</div>
<div v-for="(feature, index) in features" :key="index">
<ExamplePane
@ -27,7 +27,7 @@
import { defineComponent, markRaw } from "vue";
import { WasmBezier } from "@/../wasm/pkg";
import { drawBezier, drawBezierHelper, drawCircle, drawCircleSector, drawCurve, drawLine, drawPoint, drawText, getContextFromCanvas, COLORS } from "@/utils/drawing";
import { drawBezier, drawCircleSector, drawCurve, drawLine, drawPoint, getContextFromCanvas, COLORS } from "@/utils/drawing";
import { BezierCurveType, CircleSector, Point, WasmBezierInstance, WasmSubpathInstance } from "@/utils/types";
import BezierExamplePane from "@/components/BezierExamplePane.vue";
@ -43,8 +43,6 @@ const tSliderOptions = {
variable: "t",
};
const SCALE_UNIT_VECTOR_FACTOR = 50;
export default defineComponent({
data() {
return {
@ -108,240 +106,169 @@ export default defineComponent({
},
},
},
],
features: [
{
name: "Length",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance): void => {
drawText(getContextFromCanvas(canvas), `Length: ${bezier.length().toFixed(2)}`, 5, canvas.height - 7);
},
callback: (bezier: WasmBezierInstance, _: Record<string, number>): string => bezier.length(),
},
{
name: "Evaluate",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const point = JSON.parse(bezier.evaluate(options.t));
drawPoint(getContextFromCanvas(canvas), point, 4, COLORS.NON_INTERACTIVE.STROKE_1);
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.evaluate(options.t),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [tSliderOptions],
},
},
template: markRaw(SliderExample),
templateOptions: { sliders: [tSliderOptions] },
},
{
name: "Lookup Table",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const lookupPoints: Point[] = JSON.parse(bezier.compute_lookup_table(options.steps));
lookupPoints.forEach((point, index) => {
if (index !== 0 && index !== lookupPoints.length - 1) {
drawPoint(getContextFromCanvas(canvas), point, 3, COLORS.NON_INTERACTIVE.STROKE_1);
}
});
},
template: markRaw(SliderExample),
templateOptions: {
sliders: [
{
min: 2,
max: 15,
step: 1,
default: 5,
variable: "steps",
},
],
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.compute_lookup_table(options.steps),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [
{
min: 2,
max: 15,
step: 1,
default: 5,
variable: "steps",
},
],
},
},
},
{
name: "Derivative",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance): void => {
const context = getContextFromCanvas(canvas);
const derivativeBezier = bezier.derivative();
if (derivativeBezier) {
const points: Point[] = JSON.parse(derivativeBezier.get_points());
if (points.length === 2) {
drawLine(context, points[0], points[1], COLORS.NON_INTERACTIVE.STROKE_1);
} else {
drawBezier(context, points, null, { curveStrokeColor: COLORS.NON_INTERACTIVE.STROKE_1, radius: 3.5 });
}
}
},
curveDegrees: new Set([BezierCurveType.Quadratic, BezierCurveType.Cubic]),
customPoints: {
[BezierCurveType.Quadratic]: [
[30, 40],
[110, 50],
[120, 130],
],
[BezierCurveType.Cubic]: [
[50, 50],
[60, 100],
[100, 140],
[140, 150],
],
callback: (bezier: WasmBezierInstance, _: Record<string, number>): string => bezier.derivative(),
exampleOptions: {
[BezierCurveType.Linear]: {
disabled: true,
},
[BezierCurveType.Quadratic]: {
customPoints: [
[30, 40],
[110, 50],
[120, 130],
],
},
[BezierCurveType.Cubic]: {
customPoints: [
[50, 50],
[60, 100],
[100, 140],
[140, 150],
],
},
},
},
{
name: "Tangent",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const context = getContextFromCanvas(canvas);
const intersection = JSON.parse(bezier.evaluate(options.t));
const tangent = JSON.parse(bezier.tangent(options.t));
const tangentEnd = {
x: intersection.x + tangent.x * SCALE_UNIT_VECTOR_FACTOR,
y: intersection.y + tangent.y * SCALE_UNIT_VECTOR_FACTOR,
};
drawPoint(context, intersection, 3, COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, intersection, tangentEnd, COLORS.NON_INTERACTIVE.STROKE_1);
drawPoint(context, tangentEnd, 3, COLORS.NON_INTERACTIVE.STROKE_1);
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.tangent(options.t),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [tSliderOptions],
},
},
template: markRaw(SliderExample),
templateOptions: { sliders: [tSliderOptions] },
},
{
name: "Normal",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const context = getContextFromCanvas(canvas);
const intersection = JSON.parse(bezier.evaluate(options.t));
const normal = JSON.parse(bezier.normal(options.t));
const normalEnd = {
x: intersection.x + normal.x * SCALE_UNIT_VECTOR_FACTOR,
y: intersection.y + normal.y * SCALE_UNIT_VECTOR_FACTOR,
};
drawPoint(context, intersection, 3, COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, intersection, normalEnd, COLORS.NON_INTERACTIVE.STROKE_1);
drawPoint(context, normalEnd, 3, COLORS.NON_INTERACTIVE.STROKE_1);
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.normal(options.t),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [tSliderOptions],
},
},
template: markRaw(SliderExample),
templateOptions: { sliders: [tSliderOptions] },
},
{
name: "Curvature",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const context = getContextFromCanvas(canvas);
const point = JSON.parse(bezier.evaluate(options.t));
const normal = JSON.parse(bezier.normal(options.t));
const curvature = bezier.curvature(options.t);
const radius = 1 / curvature;
const curvatureCenter = { x: point.x + normal.x * radius, y: point.y + normal.y * radius };
drawCircle(context, curvatureCenter, Math.abs(radius), COLORS.NON_INTERACTIVE.STROKE_1);
drawLine(context, point, curvatureCenter, COLORS.NON_INTERACTIVE.STROKE_1);
drawPoint(context, point, 3, COLORS.NON_INTERACTIVE.STROKE_1);
drawPoint(context, curvatureCenter, 3, COLORS.NON_INTERACTIVE.STROKE_1);
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.curvature(options.t),
exampleOptions: {
[BezierCurveType.Linear]: {
disabled: true,
},
[BezierCurveType.Quadratic]: {
sliderOptions: [tSliderOptions],
},
},
curveDegrees: new Set([BezierCurveType.Quadratic, BezierCurveType.Cubic]),
template: markRaw(SliderExample),
templateOptions: { sliders: [tSliderOptions] },
},
{
name: "Split",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const context = getContextFromCanvas(canvas);
const bezierPairPoints = JSON.parse(bezier.split(options.t));
drawBezier(context, bezierPairPoints[0], null, { curveStrokeColor: COLORS.NON_INTERACTIVE.STROKE_2, radius: 3.5 });
drawBezier(context, bezierPairPoints[1], null, { curveStrokeColor: COLORS.NON_INTERACTIVE.STROKE_1, radius: 3.5 });
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.split(options.t),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [tSliderOptions],
},
},
template: markRaw(SliderExample),
templateOptions: { sliders: [tSliderOptions] },
},
{
name: "Trim",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
const context = getContextFromCanvas(canvas);
const trimmedBezier = bezier.trim(options.t1, options.t2);
drawBezierHelper(context, trimmedBezier, { curveStrokeColor: COLORS.NON_INTERACTIVE.STROKE_1, radius: 3.5 });
},
template: markRaw(SliderExample),
templateOptions: {
sliders: [
{
variable: "t1",
min: 0,
max: 1,
step: 0.01,
default: 0.25,
},
{
variable: "t2",
min: 0,
max: 1,
step: 0.01,
default: 0.75,
},
],
callback: (bezier: WasmBezierInstance, options: Record<string, number>): string => bezier.trim(options.t1, options.t2),
exampleOptions: {
[BezierCurveType.Quadratic]: {
sliderOptions: [
{
variable: "t1",
min: 0,
max: 1,
step: 0.01,
default: 0.25,
},
{
variable: "t2",
min: 0,
max: 1,
step: 0.01,
default: 0.75,
},
],
},
},
},
{
name: "Project",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>, mouseLocation?: Point): void => {
if (mouseLocation != null) {
const context = getContextFromCanvas(canvas);
const t = bezier.project(mouseLocation.x, mouseLocation.y);
const closestPoint = JSON.parse(bezier.evaluate(t));
drawLine(context, mouseLocation, closestPoint, COLORS.NON_INTERACTIVE.STROKE_1);
}
},
callback: (bezier: WasmBezierInstance, _: Record<string, number>, mouseLocation: Point): string =>
mouseLocation ? bezier.project(mouseLocation.x, mouseLocation.y) : bezier.to_svg(),
triggerOnMouseMove: true,
},
{
name: "Local Extrema",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance): void => {
const context = getContextFromCanvas(canvas);
const dimensionColors = ["red", "green"];
const extrema: number[][] = JSON.parse(bezier.local_extrema());
extrema.forEach((tValues, index) => {
tValues.forEach((t) => {
const point: Point = JSON.parse(bezier.evaluate(t));
drawPoint(context, point, 4, dimensionColors[index]);
});
});
drawText(getContextFromCanvas(canvas), "X extrema", 5, canvas.height - 20, dimensionColors[0]);
drawText(getContextFromCanvas(canvas), "Y extrema", 5, canvas.height - 5, dimensionColors[1]);
},
customPoints: {
[BezierCurveType.Quadratic]: [
[40, 40],
[160, 30],
[110, 150],
],
[BezierCurveType.Cubic]: [
[160, 180],
[170, 10],
[30, 90],
[180, 160],
],
callback: (bezier: WasmBezierInstance, _: Record<string, number>): string => bezier.local_extrema(),
exampleOptions: {
[BezierCurveType.Quadratic]: {
customPoints: [
[40, 40],
[160, 30],
[110, 150],
],
},
[BezierCurveType.Cubic]: {
customPoints: [
[160, 180],
[170, 10],
[30, 90],
[180, 160],
],
},
},
},
{
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);
},
callback: (bezier: WasmBezierInstance, _: Record<string, number>): string => bezier.bounding_box(),
},
{
name: "Inflections",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance): void => {
const context = getContextFromCanvas(canvas);
const inflections: number[] = JSON.parse(bezier.inflections());
inflections.forEach((t) => {
const point = JSON.parse(bezier.evaluate(t));
drawPoint(context, point, 4, COLORS.NON_INTERACTIVE.STROKE_1);
});
callback: (bezier: WasmBezierInstance, _: Record<string, number>): string => bezier.inflections(),
exampleOptions: {
[BezierCurveType.Linear]: {
disabled: true,
},
[BezierCurveType.Quadratic]: {
disabled: true,
},
},
curveDegrees: new Set([BezierCurveType.Cubic]),
},
],
features: [
{
name: "De Casteljau Points",
callback: (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>): void => {
@ -398,7 +325,7 @@ export default defineComponent({
drawLine(context, line[0], line[1], COLORS.NON_INTERACTIVE.STROKE_1);
const intersections: Float64Array = bezier.intersect_line_segment(mappedLine);
intersections.forEach((t: number) => {
const p = JSON.parse(bezier.evaluate(t));
const p = JSON.parse(bezier.evaluate_value(t));
drawPoint(context, p, 3, COLORS.NON_INTERACTIVE.STROKE_2);
});
},
@ -416,7 +343,7 @@ export default defineComponent({
drawCurve(context, points, COLORS.NON_INTERACTIVE.STROKE_1, 1);
const intersections: Float64Array = bezier.intersect_quadratic_segment(mappedPoints, options.error);
intersections.forEach((t: number) => {
const p = JSON.parse(bezier.evaluate(t));
const p = JSON.parse(bezier.evaluate_value(t));
drawPoint(context, p, 3, COLORS.NON_INTERACTIVE.STROKE_2);
});
},
@ -447,7 +374,7 @@ export default defineComponent({
drawCurve(context, points, COLORS.NON_INTERACTIVE.STROKE_1, 1);
const intersections: Float64Array = bezier.intersect_cubic_segment(mappedPoints, options.error);
intersections.forEach((t: number) => {
const p = JSON.parse(bezier.evaluate(t));
const p = JSON.parse(bezier.evaluate_value(t));
drawPoint(context, p, 3, COLORS.NON_INTERACTIVE.STROKE_2);
});
},
@ -470,7 +397,7 @@ export default defineComponent({
const context = getContextFromCanvas(canvas);
const intersections: number[][] = JSON.parse(bezier.intersect_self(options.error));
intersections.forEach((tValues: number[]) => {
const p = JSON.parse(bezier.evaluate(tValues[0]));
const p = JSON.parse(bezier.evaluate_value(tValues[0]));
drawPoint(context, p, 3, COLORS.NON_INTERACTIVE.STROKE_2);
});
},

6
website/other/bezier-rs-demos/src/components/BezierExample.vue
View file

@ -41,6 +41,10 @@ export default defineComponent({
type: Object as PropType<Array<SliderOption>>,
default: () => ({}),
},
triggerOnMouseMove: {
type: Boolean,
default: false,
},
},
data() {
const curveType = getCurveType(this.points.length);
@ -81,6 +85,8 @@ export default defineComponent({
this.bezier[this.manipulatorKeys[this.activeIndex]](mx, my);
this.mutablePoints[this.activeIndex] = [mx, my];
this.bezierSVG = this.callback(this.bezier, this.sliderData);
} else if (this.triggerOnMouseMove) {
this.bezierSVG = this.callback(this.bezier, this.sliderData, { x: mx, y: my });
}
},
getSliderValue: (sliderValue: number, sliderUnit?: string | string[]) => (Array.isArray(sliderUnit) ? sliderUnit[sliderValue] : sliderUnit),

22
website/other/bezier-rs-demos/src/components/BezierExamplePane.vue
View file

@ -3,7 +3,14 @@
<h3 class="example-pane-header">{{ name }}</h3>
<div class="example-row">
<div v-for="(example, index) in examples" :key="index">
<BezierExample v-if="!example.disabled" :title="example.title" :points="example.points" :callback="callback" :sliderOptions="example.sliderOptions" />
<BezierExample
v-if="!example.disabled"
:title="example.title"
:points="example.points"
:callback="callback"
:sliderOptions="example.sliderOptions"
:triggerOnMouseMove="triggerOnMouseMove"
/>
</div>
</div>
</div>
@ -12,7 +19,7 @@
<script lang="ts">
import { defineComponent, PropType } from "vue";
import { BezierCallback, BezierCurveType, ExampleOptions } from "@/utils/types";
import { BezierCallback, BezierCurveType, ExampleOptions, SliderOption } from "@/utils/types";
import BezierExample from "@/components/BezierExample.vue";
@ -27,6 +34,10 @@ export default defineComponent({
type: Object as PropType<ExampleOptions>,
default: () => ({}),
},
triggerOnMouseMove: {
type: Boolean,
default: false,
},
},
data() {
const exampleDefaults = {
@ -53,15 +64,18 @@ export default defineComponent({
},
};
// Use quadratic slider options as a default if sliders are not provided for the other curve types.
const defaultSliderOptions: SliderOption[] = this.exampleOptions[BezierCurveType.Quadratic]?.sliderOptions || [];
return {
examples: Object.values(BezierCurveType).map((curveType) => {
examples: Object.values(BezierCurveType).map((curveType: BezierCurveType) => {
const givenData = this.exampleOptions[curveType];
const defaultData = exampleDefaults[curveType];
return {
title: curveType,
disabled: givenData?.disabled || false,
points: givenData?.customPoints || defaultData.points,
sliderOptions: givenData?.sliderOptions || [],
sliderOptions: givenData?.sliderOptions || defaultSliderOptions,
};
}),
};

7
website/other/bezier-rs-demos/src/utils/drawing.ts
View file

@ -1,4 +1,4 @@
import { BezierStyleConfig, CircleSector, Point, WasmBezierInstance } from "@/utils/types";
import { BezierStyleConfig, CircleSector, Point } from "@/utils/types";
const HANDLE_RADIUS_FACTOR = 2 / 3;
const DEFAULT_ENDPOINT_RADIUS = 5;
@ -95,11 +95,6 @@ export const drawCircleSector = (ctx: CanvasRenderingContext2D, circleSector: Ci
ctx.fill();
};
export const drawBezierHelper = (ctx: CanvasRenderingContext2D, bezier: WasmBezierInstance, bezierStyleConfig: Partial<BezierStyleConfig> = {}): void => {
const points = JSON.parse(bezier.get_points());
drawBezier(ctx, points, null, bezierStyleConfig);
};
export const drawBezier = (ctx: CanvasRenderingContext2D, points: Point[], dragIndex: number | null = null, bezierStyleConfig: Partial<BezierStyleConfig> = {}): void => {
const styleConfig: BezierStyleConfig = {
curveStrokeColor: COLORS.INTERACTIVE.STROKE_1,

2
website/other/bezier-rs-demos/src/utils/types.ts
View file

@ -15,7 +15,7 @@ export enum BezierCurveType {
}
export type Callback = (canvas: HTMLCanvasElement, bezier: WasmBezierInstance, options: Record<string, number>, mouseLocation?: Point) => void;
export type BezierCallback = (bezier: WasmBezierInstance, options: Record<string, number>) => string;
export type BezierCallback = (bezier: WasmBezierInstance, options: Record<string, number>, mouseLocation?: Point) => string;
export type SubpathCallback = (subpath: WasmSubpathInstance) => string;
export type ExampleOptions = {

220
website/other/bezier-rs-demos/wasm/src/bezier.rs
View file

@ -27,6 +27,8 @@ pub enum WasmMaximizeArcs {
Off, // 2
}
const SCALE_UNIT_VECTOR_FACTOR: f64 = 50.;
/// Wrapper of the `Bezier` struct to be used in JS.
#[wasm_bindgen]
#[derive(Clone)]
@ -127,7 +129,7 @@ impl WasmBezier {
to_js_value(points)
}
pub fn to_svg(&self) -> String {
fn get_bezier_path(&self) -> String {
let mut bezier = String::new();
self.0.to_svg(
&mut bezier,
@ -136,75 +138,219 @@ impl WasmBezier {
HANDLE_ATTRIBUTES.to_string(),
HANDLE_LINE_ATTRIBUTES.to_string(),
);
wrap_svg_tag(bezier)
bezier
}
pub fn length(&self) -> f64 {
self.0.length(None)
pub fn to_svg(&self) -> String {
wrap_svg_tag(self.get_bezier_path())
}
pub fn length(&self) -> String {
let bezier = self.get_bezier_path();
wrap_svg_tag(format!("{bezier}{}", draw_text(format!("Length: {:.2}", self.0.length(None)), TEXT_OFFSET_X, TEXT_OFFSET_Y, BLACK)))
}
/// The wrapped return type is `Point`.
pub fn evaluate(&self, t: f64) -> JsValue {
pub fn evaluate_value(&self, t: f64) -> JsValue {
let point: Point = vec_to_point(&self.0.evaluate(t));
to_js_value(point)
}
/// The wrapped return type is `Vec<Point>`.
pub fn compute_lookup_table(&self, steps: usize) -> JsValue {
pub fn evaluate(&self, t: f64) -> String {
let bezier = self.get_bezier_path();
let point = &self.0.evaluate(t);
let content = format!("{bezier}{}", draw_circle(point.x, point.y, 4., RED, 1.5, WHITE));
wrap_svg_tag(content)
}
pub fn compute_lookup_table(&self, steps: usize) -> String {
let bezier = self.get_bezier_path();
let table_values: Vec<Point> = self.0.compute_lookup_table(Some(steps)).iter().map(vec_to_point).collect();
to_js_value(table_values)
let circles: String = table_values
.iter()
.map(|point| draw_circle(point.x, point.y, 3., RED, 1.5, WHITE))
.fold("".to_string(), |acc, circle| acc + &circle);
let content = format!("{bezier}{circles}");
wrap_svg_tag(content)
}
pub fn derivative(&self) -> Option<WasmBezier> {
self.0.derivative().map(WasmBezier)
pub fn derivative(&self) -> String {
let bezier = self.get_bezier_path();
let derivative = self.0.derivative();
if derivative.is_none() {
return bezier;
}
let mut derivative_svg_path = String::new();
derivative.unwrap().to_svg(
&mut derivative_svg_path,
CURVE_ATTRIBUTES.to_string().replace(BLACK, RED),
ANCHOR_ATTRIBUTES.to_string().replace(BLACK, RED),
HANDLE_ATTRIBUTES.to_string().replace(GRAY, RED),
HANDLE_LINE_ATTRIBUTES.to_string().replace(GRAY, RED),
);
let content = format!("{bezier}{derivative_svg_path}");
wrap_svg_tag(content)
}
/// The wrapped return type is `Point`.
pub fn tangent(&self, t: f64) -> JsValue {
let tangent_point: Point = vec_to_point(&self.0.tangent(t));
to_js_value(tangent_point)
pub fn tangent(&self, t: f64) -> String {
let bezier = self.get_bezier_path();
let tangent_point = self.0.tangent(t);
let intersection_point = self.0.evaluate(t);
let tangent_end = intersection_point + tangent_point * SCALE_UNIT_VECTOR_FACTOR;
let content = format!(
"{bezier}{}{}{}",
draw_circle(intersection_point.x, intersection_point.y, 3., RED, 1., WHITE),
draw_line(intersection_point.x, intersection_point.y, tangent_end.x, tangent_end.y, RED, 1.),
draw_circle(tangent_end.x, tangent_end.y, 3., RED, 1., WHITE),
);
wrap_svg_tag(content)
}
/// The wrapped return type is `Point`.
pub fn normal(&self, t: f64) -> JsValue {
let normal_point: Point = vec_to_point(&self.0.normal(t));
to_js_value(normal_point)
pub fn normal(&self, t: f64) -> String {
let bezier = self.get_bezier_path();
let normal_point = self.0.normal(t);
let intersection_point = self.0.evaluate(t);
let normal_end = intersection_point + normal_point * SCALE_UNIT_VECTOR_FACTOR;
let content = format!(
"{bezier}{}{}{}",
draw_line(intersection_point.x, intersection_point.y, normal_end.x, normal_end.y, RED, 1.),
draw_circle(intersection_point.x, intersection_point.y, 3., RED, 1., WHITE),
draw_circle(normal_end.x, normal_end.y, 3., RED, 1., WHITE),
);
wrap_svg_tag(content)
}
pub fn curvature(&self, t: f64) -> f64 {
self.0.curvature(t)
pub fn curvature(&self, t: f64) -> String {
let bezier = self.get_bezier_path();
let radius = 1. / self.0.curvature(t);
let normal_point = self.0.normal(t);
let intersection_point = self.0.evaluate(t);
let curvature_center = intersection_point + normal_point * radius;
let content = format!(
"{bezier}{}{}{}{}",
draw_circle(curvature_center.x, curvature_center.y, radius.abs(), RED, 1., NONE),
draw_line(intersection_point.x, intersection_point.y, curvature_center.x, curvature_center.y, RED, 1.),
draw_circle(intersection_point.x, intersection_point.y, 3., RED, 1., WHITE),
draw_circle(curvature_center.x, curvature_center.y, 3., RED, 1., WHITE),
);
wrap_svg_tag(content)
}
/// The wrapped return type is `[Vec<Point>; 2]`.
pub fn split(&self, t: f64) -> JsValue {
let bezier_points: [Vec<Point>; 2] = self.0.split(t).map(bezier_to_points);
to_js_value(bezier_points)
pub fn split(&self, t: f64) -> String {
let beziers: [Bezier; 2] = self.0.split(t);
let mut original_bezier_svg = String::new();
self.0.to_svg(
&mut original_bezier_svg,
CURVE_ATTRIBUTES.to_string().replace(BLACK, WHITE),
ANCHOR_ATTRIBUTES.to_string().replace(BLACK, WHITE),
HANDLE_ATTRIBUTES.to_string(),
HANDLE_LINE_ATTRIBUTES.to_string(),
);
let mut bezier_svg_1 = String::new();
beziers[0].to_svg(
&mut bezier_svg_1,
CURVE_ATTRIBUTES.to_string().replace(BLACK, ORANGE),
ANCHOR_ATTRIBUTES.to_string().replace(BLACK, ORANGE),
HANDLE_ATTRIBUTES.to_string().replace(GRAY, ORANGE),
HANDLE_LINE_ATTRIBUTES.to_string().replace(GRAY, ORANGE),
);
let mut bezier_svg_2 = String::new();
beziers[1].to_svg(
&mut bezier_svg_2,
CURVE_ATTRIBUTES.to_string().replace(BLACK, RED),
ANCHOR_ATTRIBUTES.to_string().replace(BLACK, RED),
HANDLE_ATTRIBUTES.to_string().replace(GRAY, RED),
HANDLE_LINE_ATTRIBUTES.to_string().replace(GRAY, RED),
);
wrap_svg_tag(format!("{original_bezier_svg}{bezier_svg_1}{bezier_svg_2}"))
}
pub fn trim(&self, t1: f64, t2: f64) -> WasmBezier {
WasmBezier(self.0.trim(t1, t2))
pub fn trim(&self, t1: f64, t2: f64) -> String {
let trimmed_bezier = self.0.trim(t1, t2);
let mut trimmed_bezier_svg = String::new();
trimmed_bezier.to_svg(
&mut trimmed_bezier_svg,
CURVE_ATTRIBUTES.to_string().replace(BLACK, RED),
ANCHOR_ATTRIBUTES.to_string().replace(BLACK, RED),
HANDLE_ATTRIBUTES.to_string().replace(GRAY, RED),
HANDLE_LINE_ATTRIBUTES.to_string().replace(GRAY, RED),
);
wrap_svg_tag(format!("{}{trimmed_bezier_svg}", self.get_bezier_path()))
}
pub fn project(&self, x: f64, y: f64) -> f64 {
self.0.project(DVec2::new(x, y), ProjectionOptions::default())
pub fn project(&self, x: f64, y: f64) -> String {
let projected_t_value = self.0.project(DVec2::new(x, y), ProjectionOptions::default());
let projected_point = self.0.evaluate(projected_t_value);
let bezier = self.get_bezier_path();
let content = format!("{bezier}{}", draw_line(projected_point.x, projected_point.y, x, y, RED, 1.),);
wrap_svg_tag(content)
}
/// The wrapped return type is `[Vec<f64>; 2]`.
pub fn local_extrema(&self) -> JsValue {
pub fn local_extrema(&self) -> String {
let local_extrema: [Vec<f64>; 2] = self.0.local_extrema();
to_js_value(local_extrema)
let bezier = self.get_bezier_path();
let circles: String = local_extrema
.iter()
.zip([RED, GREEN])
.flat_map(|(t_value_list, color)| {
t_value_list.iter().map(|&t_value| {
let point = self.0.evaluate(t_value);
draw_circle(point.x, point.y, 3., color, 1.5, WHITE)
})
})
.fold("".to_string(), |acc, circle| acc + &circle);
let content = format!(
"{bezier}{circles}{}{}",
draw_text("X extrema".to_string(), TEXT_OFFSET_X, TEXT_OFFSET_Y - 20., RED),
draw_text("Y extrema".to_string(), TEXT_OFFSET_X, TEXT_OFFSET_Y, GREEN),
);
wrap_svg_tag(content)
}
/// The wrapped return type is `[Point; 2]`.
pub fn bounding_box(&self) -> JsValue {
let bbox_points: [Point; 2] = self.0.bounding_box().map(|p| Point { x: p.x, y: p.y });
to_js_value(bbox_points)
pub fn bounding_box(&self) -> String {
let [bbox_min_corner, bbox_max_corner] = self.0.bounding_box();
let bezier = self.get_bezier_path();
let content = format!(
"{bezier}<rect x={} y ={} width=\"{}\" height=\"{}\" style=\"fill:{NONE};stroke:{RED};stroke-width:1\" />",
bbox_min_corner.x,
bbox_min_corner.y,
bbox_max_corner.x - bbox_min_corner.x,
bbox_max_corner.y - bbox_min_corner.y,
);
wrap_svg_tag(content)
}
/// The wrapped return type is `Vec<f64>`.
pub fn inflections(&self) -> JsValue {
pub fn inflections(&self) -> String {
let inflections: Vec<f64> = self.0.inflections();
to_js_value(inflections)
let bezier = self.get_bezier_path();
let circles: String = inflections
.iter()
.map(|&t_value| {
let point = self.0.evaluate(t_value);
draw_circle(point.x, point.y, 3., RED, 1.5, WHITE)
})
.fold("".to_string(), |acc, circle| acc + &circle);
let content = format!("{bezier}{circles}");
wrap_svg_tag(content)
}
/// The wrapped return type is `Vec<Vec<Point>>`.

20
website/other/bezier-rs-demos/wasm/src/svg_drawing.rs
View file

@ -4,8 +4,12 @@ pub const SVG_CLOSE_TAG: &str = "</svg>";
// Stylistic constants
pub const BLACK: &str = "black";
pub const WHITE: &str = "white";
pub const GRAY: &str = "gray";
pub const RED: &str = "red";
pub const ORANGE: &str = "orange";
pub const GREEN: &str = "green";
pub const NONE: &str = "none";
// Default attributes
pub const CURVE_ATTRIBUTES: &str = "stroke=\"black\" stroke-width=\"2\" fill=\"none\"";
@ -13,7 +17,21 @@ pub const HANDLE_LINE_ATTRIBUTES: &str = "stroke=\"gray\" stroke-width=\"1\" fil
pub const ANCHOR_ATTRIBUTES: &str = "r=\"4\" stroke=\"black\" stroke-width=\"2\" fill=\"white\"";
pub const HANDLE_ATTRIBUTES: &str = "r=\"3\" stroke=\"gray\" stroke-width=\"1.5\" fill=\"white\"";
/// Helper function to create an SVG text entitty.
// Text constants
pub const TEXT_OFFSET_X: f64 = 5.;
pub const TEXT_OFFSET_Y: f64 = 193.;
/// Helper function to create an SVG text entity.
pub fn draw_text(text: String, x_pos: f64, y_pos: f64, fill: &str) -> String {
format!(r#"<text x="{x_pos}" y="{y_pos}" fill="{fill}">{text}</text>"#)
}
/// Helper function to create an SVG circle entity.
pub fn draw_circle(x_pos: f64, y_pos: f64, radius: f64, stroke: &str, stroke_width: f64, fill: &str) -> String {
format!(r#"<circle cx="{x_pos}" cy="{y_pos}" r="{radius}" stroke="{stroke}" stroke-width="{stroke_width}" fill="{fill}"/>"#)
}
/// Helper function to create an SVG circle entity.
pub fn draw_line(start_x: f64, start_y: f64, end_x: f64, end_y: f64, stroke: &str, stroke_width: f64) -> String {
format!(r#"<line x1="{start_x}" y1="{start_y}" x2="{end_x}" y2="{end_y}" stroke="{stroke}" stroke-width="{stroke_width}"/>"#)
}