no-wrap option; pivoted exponential zoom

client/world/renderer_lines.go

@@ -2,15 +2,17 @@ package world
 
 // renderLinesStageB performs a full expanded-canvas redraw but renders ONLY Line primitives.
 // It uses the Stage A render plan: tiles + per-tile clip + per-tile candidates.
-func (w *World) renderLinesStageB(drawer PrimitiveDrawer, params RenderParams) error {
-	plan, err := w.buildRenderPlanStageA(params)
-	if err != nil {
-		return err
-	}
+// func (w *World) renderLinesStageB(drawer PrimitiveDrawer, params RenderParams) error {
+// 	plan, err := w.buildRenderPlanStageA(params)
+// 	if err != nil {
+// 		return err
+// 	}
 
-	drawLinesFromPlan(drawer, plan, w.W, w.H)
-	return nil
-}
+// 	allowWrap := params.Options == nil || !params.Options.DisableWrapScroll
+
+// 	drawLinesFromPlan(drawer, plan, w.W, w.H, allowWrap)
+// 	return nil
+// }
 
 // lineSeg is one canonical segment (endpoints in [0..W) x [0..H)) to be drawn.
 // It represents part of the torus-shortest polyline for a Line primitive after wrap splitting.
@@ -20,7 +22,7 @@ type lineSeg struct {
 }
 
 // drawLinesFromPlan executes a lines-only draw from an already built render plan.
-func drawLinesFromPlan(drawer PrimitiveDrawer, plan RenderPlan, worldW, worldH int) {
+func drawLinesFromPlan(drawer PrimitiveDrawer, plan RenderPlan, worldW, worldH int, allowWrap bool) {
 	for _, td := range plan.Tiles {
 		if td.ClipW <= 0 || td.ClipH <= 0 {
 			continue
@@ -42,7 +44,12 @@ func drawLinesFromPlan(drawer PrimitiveDrawer, plan RenderPlan, worldW, worldH i
 		// Collect segments that actually intersect this tile's canonical rect.
 		segsToDraw := make([]lineSeg, 0, len(lines))
 		for _, l := range lines {
-			segs := torusShortestLineSegments(l, worldW, worldH)
+			var segs []lineSeg
+			if allowWrap {
+				segs = torusShortestLineSegments(l, worldW, worldH)
+			} else {
+				segs = []lineSeg{{x1: l.X1, y1: l.Y1, x2: l.X2, y2: l.Y2}}
+			}
 			for _, s := range segs {
 				if segmentIntersectsRect(s, td.Tile.Rect) {
 					segsToDraw = append(segsToDraw, s)