Add a button to hide construction entities.

Also, mark not just curves, but also points and normals derived from
construction requests as construction.

Also, don't always mark arc center point as construction just to
exclude it from chord tolerance bounding box calculation; instead,
special-case it there.

CHANGELOG.md

@@ -69,6 +69,7 @@ Other new features:
   * New command-line interface, for batch exporting and more.
   * The graphical interface now supports HiDPI screens on every OS.
   * New option to lock Z axis to be always vertical, like in SketchUp.
+  * New button to hide all construction entities.
   * New link to match the on-screen size of the sketch with its actual size,
     "view → set to full scale".
   * When zooming to fit, constraints are also considered.

res/CMakeLists.txt

@@ -208,6 +208,7 @@ add_resources(
     icons/graphics-window/trim.png
     icons/graphics-window/vert.png
     icons/text-window/constraint.png
+    icons/text-window/construction.png
     icons/text-window/edges.png
     icons/text-window/faces.png
     icons/text-window/occluded-visible.png

src/drawentity.cpp

@@ -158,6 +158,7 @@ bool Entity::IsVisible() const {
 
     if(IsPoint() && !SS.GW.showPoints) return false;
     if(IsNormal() && !SS.GW.showNormals) return false;
+    if(construction && !SS.GW.showConstruction) return false;
 
     if(!SS.GW.showWorkplanes) {
         if(IsWorkplane() && !h.isFromRequest()) {

src/graphicswin.cpp

@@ -380,6 +380,7 @@ void GraphicsWindow::Init() {
     showWorkplanes = false;
     showNormals = true;
     showPoints = true;
+    showConstruction = true;
     showConstraints = true;
     showShaded = true;
     showEdges = true;

src/request.cpp

@@ -145,12 +145,7 @@ void Request::Generate(IdList<Entity,hEntity> *entity,
         p.h = h.entity(i+((et != (Entity::Type)0) ? 1 : 0));
         p.group = group;
         p.style = style;
-        if(type == Request::Type::ARC_OF_CIRCLE && i == 0) {
-            // mark arc center point as construction, since it shouldn't be included
-            // in bounding box calculation
-            p.construction = true;
-        }
-
+        p.construction = e.construction;
         if(workplane.v == Entity::FREE_IN_3D.v) {
             p.type = Entity::Type::POINT_IN_3D;
             // params for x y z
@@ -172,6 +167,7 @@ void Request::Generate(IdList<Entity,hEntity> *entity,
         n.h = h.entity(32);
         n.group = group;
         n.style = style;
+        n.construction = e.construction;
         if(workplane.v == Entity::FREE_IN_3D.v) {
             n.type = Entity::Type::NORMAL_IN_3D;
             n.param[0] = AddParam(param, h.param(32+0));

src/solvespace.cpp

@@ -996,6 +996,14 @@ BBox Sketch::CalculateEntityBBox(bool includingInvisible) {
         if(e.construction) continue;
         if(!(includingInvisible || e.IsVisible())) continue;
 
+        // arc center point shouldn't be included in bounding box calculation
+        if(e.IsPoint() && e.h.isFromRequest()) {
+            Request *r = SK.GetRequest(e.h.request());
+            if(r->type == Request::Type::ARC_OF_CIRCLE && e.h.v == r->h.entity(1).v) {
+                continue;
+            }
+        }
+
         if(e.IsPoint()) {
             includePoint(e.PointGetNum());
             continue;

src/textwin.cpp

@@ -161,6 +161,8 @@ static ShowHideButton normalsButton =
     { &(SS.GW.showNormals),      "normal",        "normals"                         };
 static ShowHideButton pointsButton =
     { &(SS.GW.showPoints),       "point",         "points"                          };
+static ShowHideButton constructionButton =
+    { &(SS.GW.showConstruction), "construction",  "construction entities"           };
 static ShowHideButton constraintsButton =
     { &(SS.GW.showConstraints),  "constraint",    "constraints and dimensions"      };
 static FacesButton facesButton;
@@ -178,6 +180,7 @@ static Button *buttons[] = {
     &workplanesButton,
     &normalsButton,
     &pointsButton,
+    &constructionButton,
     &constraintsButton,
     &facesButton,
     &spacerButton,

src/ui.h

@@ -768,6 +768,7 @@ public:
     bool    showWorkplanes;
     bool    showNormals;
     bool    showPoints;
+    bool    showConstruction;
     bool    showConstraints;
     bool    showTextWindow;
     bool    showShaded;