Added DrawableStrokeWidth.

src/drawables/drawable-stroke-width.ts

@@ -0,0 +1,24 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+// Licensed under the Apache License, Version 2.0.
+
+import { IDrawable } from './drawable';
+import { IDrawingWand } from './drawing-wand';
+
+/**
+ * Sets the width of the stroke used to draw object outlines.
+ */
+export class DrawableStrokeWidth implements IDrawable {
+    private readonly _width: number;
+
+    /**
+     * Initializes a new instance of the {@link DrawableStrokeWidth} class.
+     * @param width - The width.
+     */
+    constructor(width: number) {
+        this._width = width;
+    }
+
+    draw(wand: IDrawingWand): void {
+        wand.strokeWidth(this._width);
+    }
+}

src/drawables/drawing-wand.ts

@@ -32,6 +32,7 @@ export interface IDrawingWand extends IDisposable {
     rectangle(upperLeftX: number, upperLeftY: number, lowerRightX: number, lowerRightY: number): void;
     roundRectangle(upperLeftX: number, upperLeftY: number, lowerRightX: number, lowerRightY: number, cornerWidth: number, cornerHeight: number): void;
     strokeColor(value: IMagickColor): void;
+    strokeWidth(value: number): void
     text(x: number, y: number, value: string): void;
     textAlignment(value: TextAlignment): void;
     textAntialias(value: boolean): void;
@@ -134,6 +135,12 @@ export class DrawingWand extends NativeInstance implements IDrawingWand {
         });
     }
 
+    strokeWidth(value: number): void {
+        Exception.usePointer(exception => {
+            ImageMagick._api._DrawingWand_StrokeWidth(this._instance, value, exception);
+        });
+    }
+
     text(x: number, y: number, value: string): void {
         Exception.usePointer(exception => {
             _withString(value, valuePtr => {

tests/drawables/drawable-stroke-width.spec.ts

@@ -0,0 +1,28 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+// Licensed under the Apache License, Version 2.0.
+
+import { DrawableLine } from '@src/drawables/drawable-line';
+import { DrawableStrokeColor } from '@src/drawables/drawable-stroke-color';
+import { DrawableStrokeWidth } from '@src/drawables/drawable-stroke-width';
+import { MagickColors } from '@src/magick-colors';
+import { TestImages } from '@test/test-images';
+
+describe('DrawableStrokeWidth', () => {
+    it('should change the width of a line', () => {
+        TestImages.empty150x150Canvas.use((image) => {
+            const strokeColor = MagickColors.Green;
+
+            image.draw([
+                new DrawableStrokeColor(strokeColor),
+                new DrawableStrokeWidth(10),
+                new DrawableLine(10, 10, 40, 50)
+            ]);
+
+            expect(image).toHavePixelWithColor(9, 9, MagickColors.White);
+            expect(image).toHavePixelWithColor(10, 10, strokeColor);
+            expect(image).toHavePixelWithColor(6, 13, strokeColor);
+            expect(image).toHavePixelWithColor(44, 47, strokeColor);
+            expect(image).toHavePixelWithColor(40, 50, strokeColor);
+        });
+    });
+});