ui: basic map scroller

client/world/renderer_style.go

@@ -0,0 +1,54 @@
+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,
+	}
+}