gopatterns/pkg/pattern/path/path.go

// Package path provides objects to define lines on a sewing pattern.
package path

import (
	"image/color"

	"git.wtrh.nl/patterns/gopatterns/pkg/pattern/point"
	"github.com/tdewolff/canvas"
)

// Path defines a set of straight lines through points.
type Path struct {
	points    []point.Point
	thickness float64
	color     color.RGBA
}

// NewPath returns a new [Path].
func NewPath(points ...point.Point) *Path {
	black := canvas.Black
	return &Path{points: points, color: black, thickness: 0.2}
}

// NewPathWithStyle returns a new [Path] with the specified thickness and color.
func NewPathWithStyle(thickness float64, color color.RGBA, points ...point.Point) Path {
	return Path{points: points, color: color, thickness: thickness}
}

// SetThickness updates the tickness of the line
func (p *Path) SetThickness(thickness float64) {
	p.thickness = thickness
}

// Draw the path to the provided [canvas.Canvas].
func (p *Path) Draw(c *canvas.Canvas) error {
	polyline := canvas.Polyline{}
	for _, next := range p.points {
		polyline.Add(next.Vector().Values())
	}

	c.RenderPath(polyline.ToPath(),
		canvas.Style{
			Fill:         canvas.Paint{},
			Stroke:       canvas.Paint{Color: p.color},
			StrokeWidth:  p.thickness,
			StrokeCapper: canvas.RoundCap,
			StrokeJoiner: canvas.BevelJoin,
			DashOffset:   0,
			Dashes:       nil,
			FillRule:     0,
		}, canvas.Identity)

	return nil
}