gui: fix #57

1 files changed, 17 insertions, 3 deletions

diff --git a/gui/fpgaviewwidget.cc b/gui/fpgaviewwidget.cc
index 84a74587..0bbf80e2 100644
--- a/gui/fpgaviewwidget.cc
+++ b/gui/fpgaviewwidget.cc
@@ -240,9 +240,10 @@ void FPGAViewWidget::populateQuadTree(RendererData *data, const DecalXY &decal,
             continue;
         }
 
+        bool res = true;
         if (el.type == GraphicElement::TYPE_BOX) {
             // Boxes are bounded by themselves.
-            data->qt->insert(PickQuadTree::BoundingBox(x + el.x1, y + el.y1, x + el.x2, y + el.y2), element);
+            res = data->qt->insert(PickQuadTree::BoundingBox(x + el.x1, y + el.y1, x + el.x2, y + el.y2), element);
         }
 
         if (el.type == GraphicElement::TYPE_LINE || el.type == GraphicElement::TYPE_ARROW) {
@@ -261,7 +262,11 @@ void FPGAViewWidget::populateQuadTree(RendererData *data, const DecalXY &decal,
             x1 += 0.01;
             y1 += 0.01;
 
-            data->qt->insert(PickQuadTree::BoundingBox(x0, y0, x1, y1), element);
+            res = data->qt->insert(PickQuadTree::BoundingBox(x0, y0, x1, y1), element);
+        }
+
+        if (!res) {
+            NPNR_ASSERT_FALSE("populateQuadTree: could not insert element");
         }
     }
 }
@@ -450,8 +455,17 @@ void FPGAViewWidget::renderLines(void)
         NPNR_ASSERT(data->bbGlobal.w() != 0);
         NPNR_ASSERT(data->bbGlobal.h() != 0);
 
+        // Enlarge the bounding box slightly for the picking - when we insert
+        // elements into it, we enlarge their bounding boxes slightly, so
+        // we need to give ourselves some sagery margin here.
+        auto bb = data->bbGlobal;
+        bb.setX0(bb.x0() - 1);
+        bb.setY0(bb.y0() - 1);
+        bb.setX1(bb.x1() + 1);
+        bb.setY1(bb.y1() + 1);
+
         // Populate picking quadtree.
-        data->qt = std::unique_ptr<PickQuadTree>(new PickQuadTree(data->bbGlobal));
+        data->qt = std::unique_ptr<PickQuadTree>(new PickQuadTree(bb));
         for (auto const &decal : belDecals) {
             populateQuadTree(data.get(), decal.first,
                              PickedElement::fromBel(decal.second, decal.first.x, decal.first.y));