@meta2d/core/src/diagrams/message.js

@meta2d/core: Powerful, Beautiful, Simple, Open - Web-Based 2D At Its Best .

export function message(pen, ctx) {
    const path = !ctx ? new Path2D() : ctx;
    const { x, y, width, height, ey } = pen.calculative.worldRect;
    path.moveTo(x, y);
    path.lineTo(x + width, y);
    path.lineTo(x + width, y + (height * 3) / 4);
    path.lineTo(x + (width * 8) / 16, y + (height * 3) / 4);
    path.lineTo(x + width / 4, ey);
    path.lineTo(x + (width * 5) / 16, y + (height * 3) / 4);
    path.lineTo(x, y + (height * 3) / 4);
    path.closePath();
    if (path instanceof Path2D)
        return path;
}
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