package world

import "image/color"

// RenderStyle describes visual parameters for renderer passes.
// It is intentionally screen-space oriented (pixels), since the renderer
// already projects world coordinates into canvas pixels.
type RenderStyle struct {
	// PointRadiusPx is the screen-space radius for Point markers.
	PointRadiusPx float64

	// PointFill is the fill color for points.
	PointFill color.Color

	// CircleFill is the fill color for circles.
	CircleFill color.Color

	// LineStroke is the stroke color for lines.
	LineStroke color.Color

	// LineWidthPx is the stroke width for lines.
	LineWidthPx float64

	// LineDash is the dash pattern for lines. Empty => solid.
	LineDash []float64

	// LineDashOffset is the dash phase for lines.
	LineDashOffset float64
}

// DefaultRenderStyle returns the default style used when UI does not provide one.
// Defaults are intentionally simple and stable for testing.
func DefaultRenderStyle() RenderStyle {
	return RenderStyle{
		PointRadiusPx: 2.0,
		PointFill:     color.White,

		CircleFill: color.White,

		LineStroke:     color.White,
		LineWidthPx:    2.0,
		LineDash:       nil,
		LineDashOffset: 0,
	}
}

func DefaultIncrementalPolicy() IncrementalPolicy {
	return IncrementalPolicy{
		CoalesceUpdates:  false,
		AllowShiftOnly:   false,
		RenderBudgetMs:   0,
		MaxCatchUpAreaPx: 0,
	}
}