✨ Introduce API to create graphics shapes

As a first step towards a more type-safe API, this commit introduces a
set of functions to create graphics shapes. Using these functions helps
to create shapes with less code and better tool support. One advantage
of using these functions is that they return the correct type without
having to specify it explicitly.

For example, the following line of code

```ts
let r1: Rect = { type: 'rect', x: 10, y: 10, width: 200, height: 50, fillColor: 'red' };
```

can now be replaced with:

```ts
let r1 = rect(10, 10, 200, 50, { fillColor: 'red' });
```

CHANGELOG.md

@@ -2,13 +2,22 @@
 
 ## [0.5.5] - Unreleased
 
+### Added
+
+- The functions `line()`, `rect()`, `circle()`, and `path()` to create
+  graphics shapes with less code and better tool support.
+
 ### Deprecated
 
 - `TextAttrs` in favor of `TextProps`.
 - `BlockAttrs` in favor of `BlockProps`.
 - `InfoAttrs` in favor of `InfoProps`.
 - `CustomInfoAttrs` in favor of `CustomInfoProps`.
 - `Text` in favor of `TextSpan`.
+- `LineOpts` in favor of `StrokeProps`.
+- `RectOpts` in favor of `RectProps`.
+- `CircleOpts` in favor of `CircleProps`.
+- `PathOpts` in favor of `PathProps`.
 
 ## [0.5.4] - 2024-02-25
 

src/api/graphics.ts

@@ -23,9 +23,25 @@ export type Line = {
    * The y coordinate of the end point of the line.
    */
   y2: number;
-} & LineOpts;
+} & LineProps;
 
-export type LineOpts = Omit<LineProps, 'lineJoin'> & TransformProps;
+export type LineProps = Omit<StrokeProps, 'lineJoin'> & TransformProps;
+
+/** @deprecated Use `LineProps` instead. */
+export type LineOpts = LineProps;
+
+/**
+ * Creates a line with the given coordinates and properties.
+ *
+ * @param x1 - The x coordinate of the start of the line.
+ * @param y1 - The y coordinate of the start of the line.
+ * @param x2 - The x coordinate of the end of the line.
+ * @param y2 - The y coordinate of the end of the line.
+ * @param props - Optional properties for the line.
+ */
+export function line(x1: number, y1: number, x2: number, y2: number, props?: LineProps): Line {
+  return { ...props, type: 'line', x1, y1, x2, y2 };
+}
 
 /**
  * A rectangle.
@@ -48,9 +64,25 @@ export type Rect = {
    * The height of the rectangle.
    */
   height: number;
-} & RectOpts;
+} & RectProps;
 
-export type RectOpts = Omit<LineProps, 'lineCap'> & FillProps & TransformProps;
+export type RectProps = Omit<StrokeProps, 'lineCap'> & FillProps & TransformProps;
+
+/** @deprecated Use `RectProps` instead. */
+export type RectOpts = RectProps;
+
+/**
+ * Creates a rectangle with the given coordinates and properties.
+ *
+ * @param x - The x coordinate of the top left corner of the rectangle.
+ * @param y - The y coordinate of the top left corner of the rectangle.
+ * @param width - The width of the rectangle.
+ * @param height - The height of the rectangle.
+ * @param props - Optional properties for the rectangle.
+ */
+export function rect(x: number, y: number, width: number, height: number, props?: RectProps): Rect {
+  return { ...props, type: 'rect', x, y, width, height };
+}
 
 /**
  * A circle.
@@ -69,9 +101,24 @@ export type Circle = {
    * The radius of the circle.
    */
   r: number;
-} & CircleOpts;
+} & CircleProps;
 
-export type CircleOpts = Omit<LineProps, 'lineCap' | 'lineJoin'> & FillProps & TransformProps;
+export type CircleProps = Omit<StrokeProps, 'lineCap' | 'lineJoin'> & FillProps & TransformProps;
+
+/** @deprecated Use `CircleProps` instead. */
+export type CircleOpts = CircleProps;
+
+/**
+ * Creates a circle with the given center, radius, and properties.
+ *
+ * @param cx - The x coordinate of the center of the circle.
+ * @param cy - The y coordinate of the center of the circle.
+ * @param r - The radius of the circle.
+ * @param props - Optional properties for the circle.
+ */
+export function circle(cx: number, cy: number, r: number, props?: CircleProps): Circle {
+  return { ...props, type: 'circle', cx, cy, r };
+}
 
 /**
  * An SVG path element.
@@ -82,9 +129,24 @@ export type Path = {
    * An SVG path. See https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d for details.
    */
   d: string;
-} & PathOpts;
+} & PathProps;
 
-export type PathOpts = LineProps & FillProps & TransformProps;
+export type PathProps = StrokeProps & FillProps & TransformProps;
+
+/** @deprecated Use `PathProps` instead. */
+export type PathOpts = PathProps;
+
+/**
+ * Creates a path with the given path data and properties.
+ *
+ * @param d - The path data. See
+ * https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/d for
+ * details.
+ * @param props - Optional properties for the path.
+ */
+export function path(d: string, props?: PathProps): Path {
+  return { ...props, type: 'path', d };
+}
 
 /**
  * A polyline, i.e. a line consisting of multiple segments.
@@ -102,12 +164,13 @@ export type Polyline = {
   closePath?: boolean;
 } & PolyLineOpts;
 
-export type PolyLineOpts = LineProps & FillProps & TransformProps;
+/** @deprecated  Use `Path` instead of `PolyLine`. */
+export type PolyLineOpts = StrokeProps & FillProps & TransformProps;
 
 export type LineCap = 'butt' | 'round' | 'square';
 export type LineJoin = 'miter' | 'round' | 'bevel';
 
-type LineProps = {
+type StrokeProps = {
   /**
    * The width of stroked lines in pt.
    */