feat: primitive styling

client/world/renderer_draw_primitives.go

@@ -0,0 +1,87 @@
+package world
+
+// drawPointInTile draws point marker copies that intersect the tile.
+// lastStyle is already applied; it provides PointRadiusPx.
+func (w *World) drawPointInTile(drawer PrimitiveDrawer, plan RenderPlan, td TileDrawPlan, p Point, allowWrap bool, lastStyle Style) {
+	rPx := lastStyle.PointRadiusPx
+	if rPx <= 0 {
+		// Nothing visible.
+		return
+	}
+
+	// Convert screen radius to world-fixed conservatively.
+	rWorldFp := PixelSpanToWorldFixed(int(rPx+0.999999), plan.ZoomFp)
+
+	var shifts []wrapShift
+	if allowWrap {
+		shifts = pointWrapShifts(p, rWorldFp, w.W, w.H)
+	} else {
+		shifts = []wrapShift{{dx: 0, dy: 0}}
+	}
+
+	for _, s := range shifts {
+		if allowWrap && !pointCopyIntersectsTile(p, rWorldFp, s.dx, s.dy, td.Tile) {
+			continue
+		}
+
+		px := worldSpanFixedToCanvasPx((p.X+td.Tile.OffsetX+s.dx)-plan.WorldRect.minX, plan.ZoomFp)
+		py := worldSpanFixedToCanvasPx((p.Y+td.Tile.OffsetY+s.dy)-plan.WorldRect.minY, plan.ZoomFp)
+
+		drawer.AddPoint(float64(px), float64(py), rPx)
+
+		// For points we use Fill if fill is configured, otherwise Stroke if stroke is configured.
+		if lastStyle.FillColor != nil {
+			drawer.Fill()
+		} else if lastStyle.StrokeColor != nil {
+			drawer.Stroke()
+		}
+	}
+}
+
+func (w *World) drawCircleInTile(drawer PrimitiveDrawer, plan RenderPlan, td TileDrawPlan, c Circle, allowWrap bool, lastStyle Style) {
+	var shifts []wrapShift
+	if allowWrap {
+		shifts = circleWrapShifts(c, w.W, w.H)
+	} else {
+		shifts = []wrapShift{{dx: 0, dy: 0}}
+	}
+
+	rPx := worldSpanFixedToCanvasPx(c.Radius, plan.ZoomFp)
+
+	for _, s := range shifts {
+		if allowWrap && !circleCopyIntersectsTile(c, s.dx, s.dy, td.Tile, w.W, w.H) {
+			continue
+		}
+
+		cxPx := worldSpanFixedToCanvasPx((c.X+td.Tile.OffsetX+s.dx)-plan.WorldRect.minX, plan.ZoomFp)
+		cyPx := worldSpanFixedToCanvasPx((c.Y+td.Tile.OffsetY+s.dy)-plan.WorldRect.minY, plan.ZoomFp)
+
+		drawer.AddCircle(float64(cxPx), float64(cyPx), float64(rPx))
+
+		if lastStyle.FillColor != nil {
+			drawer.Fill()
+		} else if lastStyle.StrokeColor != nil {
+			drawer.Stroke()
+		}
+	}
+}
+
+func (w *World) drawLineInTile(drawer PrimitiveDrawer, plan RenderPlan, td TileDrawPlan, l Line, allowWrap bool) {
+	var segs []lineSeg
+	if allowWrap {
+		segs = torusShortestLineSegments(l, w.W, w.H)
+	} else {
+		segs = []lineSeg{{x1: l.X1, y1: l.Y1, x2: l.X2, y2: l.Y2}}
+	}
+
+	for _, s := range segs {
+		// Project into tile/canvas.
+		x1 := worldSpanFixedToCanvasPx((s.x1+td.Tile.OffsetX)-plan.WorldRect.minX, plan.ZoomFp)
+		y1 := worldSpanFixedToCanvasPx((s.y1+td.Tile.OffsetY)-plan.WorldRect.minY, plan.ZoomFp)
+		x2 := worldSpanFixedToCanvasPx((s.x2+td.Tile.OffsetX)-plan.WorldRect.minX, plan.ZoomFp)
+		y2 := worldSpanFixedToCanvasPx((s.y2+td.Tile.OffsetY)-plan.WorldRect.minY, plan.ZoomFp)
+
+		drawer.AddLine(float64(x1), float64(y1), float64(x2), float64(y2))
+		drawer.Stroke()
+	}
+}