Add cubics, and tweak mouse handling code.

[git-p4: depot-paths = "//depot/solvespace/": change = 1689]

entity.cpp

@@ -321,6 +321,26 @@ void Entity::DrawOrGetDistance(int order) {
             break;
         }
 
+        case CUBIC: {
+            Vector p0 = SS.GetEntity(assoc[0])->PointGetCoords();
+            Vector p1 = SS.GetEntity(assoc[1])->PointGetCoords();
+            Vector p2 = SS.GetEntity(assoc[2])->PointGetCoords();
+            Vector p3 = SS.GetEntity(assoc[3])->PointGetCoords();
+            int i, n = 20;
+            Vector prev = p0;
+            for(i = 1; i <= n; i++) {
+                double t = ((double)i)/n;
+                Vector p =
+                    (p0.ScaledBy((1 - t)*(1 - t)*(1 - t))).Plus(
+                    (p1.ScaledBy(3*t*(1 - t)*(1 - t))).Plus(
+                    (p2.ScaledBy(3*t*t*(1 - t))).Plus(
+                    (p3.ScaledBy(t*t*t)))));
+                LineDrawOrGetDistanceOrEdge(prev, p);
+                prev = p;
+            }
+            break;
+        }
+
         default:
             oops();
     }

graphicswin.cpp

@@ -58,7 +58,7 @@ const GraphicsWindow::MenuEntry GraphicsWindow::menu[] = {
 { 1, "&Rectangle\tR",                       MNU_RECTANGLE,      'R',    mReq  },
 { 1, "&Circle\tC",                          0,                  'C',    mReq  },
 { 1, "&Arc of a Circle\tA",                 0,                  'A',    mReq  },
-{ 1, "&Cubic Segment\t3",                   0,                  '3',    mReq  },
+{ 1, "&Cubic Segment\t3",                   MNU_CUBIC,          '3',    mReq  },
 { 1, NULL,                                  0,                          NULL  },
 { 1, "Sym&bolic Variable\tB",               0,                  'B',    mReq  },
 { 1, "&Import From File...\tI",             0,                  'I',    mReq  },
@@ -320,6 +320,7 @@ void GraphicsWindow::MenuRequest(int id) {
             
         case MNU_DATUM_POINT: s = "click to place datum point"; goto c;
         case MNU_LINE_SEGMENT: s = "click first point of line segment"; goto c;
+        case MNU_CUBIC: s = "click first point of cubic segment"; goto c;
 c:
             SS.GW.pendingOperation = id;
             SS.GW.pendingDescription = s;
@@ -388,54 +389,56 @@ void GraphicsWindow::MouseMoved(double x, double y, bool leftDown,
         orig.mouse.y = y;
 
         InvalidateGraphics();
-    } else if(leftDown) {
+        return;
-        // We are left-dragging. This is often used to drag points, or
+    }
-        // constraint labels.
+   
+    // Enforce a bit of static friction before we start dragging.
     double dm = orig.mouse.DistanceTo(mp);
-        // Don't start a drag until we've moved some threshold distance from
+    if(leftDown && dm > 3 && pendingOperation == 0) {
-        // the mouse-down point, to avoid accidental drags.
-        double dmt = 3;
-        if(pendingOperation == 0) {
         if(hover.entity.v && 
            SS.GetEntity(hover.entity)->IsPoint() && 
            !SS.GetEntity(hover.entity)->PointIsFromReferences())
         {
-                if(dm > dmt) {
             // Start dragging this point.
             ClearSelection();
             pendingPoint = hover.entity;
             pendingOperation = DRAGGING_POINT;
-                }
         } else if(hover.constraint.v && 
                         SS.GetConstraint(hover.constraint)->HasLabel())
         {
-                if(dm > dmt) {
             ClearSelection();
             pendingConstraint = hover.constraint;
             pendingOperation = DRAGGING_CONSTRAINT;
         }
-            }
+    } else if(leftDown && pendingOperation == DRAGGING_CONSTRAINT) {
-        } else if(pendingOperation == DRAGGING_POINT ||
-                  pendingOperation == DRAGGING_NEW_POINT ||
-                  pendingOperation == DRAGGING_NEW_LINE_POINT)
-        {
-            UpdateDraggedEntity(pendingPoint, x, y);
-        } else if(pendingOperation == DRAGGING_CONSTRAINT) {
         Constraint *c = SS.constraint.FindById(pendingConstraint);
         UpdateDraggedPoint(&(c->disp.offset), x, y);
+    } else if(leftDown && pendingOperation == DRAGGING_POINT) {
+        UpdateDraggedEntity(pendingPoint, x, y);
+        HitTestMakeSelection(mp);
     }
-    } else {
+
     // No buttons pressed.
     if(pendingOperation == DRAGGING_NEW_POINT ||
        pendingOperation == DRAGGING_NEW_LINE_POINT)
     {
         UpdateDraggedEntity(pendingPoint, x, y);
         HitTestMakeSelection(mp);
-        } else {
+    } else if(pendingOperation == DRAGGING_NEW_CUBIC_POINT) {
+        UpdateDraggedEntity(pendingPoint, x, y);
+        HitTestMakeSelection(mp);
+
+        hRequest hr = pendingPoint.request();
+        Vector p0 = SS.GetEntity(hr.entity(1))->PointGetCoords();
+        Vector p3 = SS.GetEntity(hr.entity(4))->PointGetCoords();
+        Vector p1 = p0.ScaledBy(2.0/3).Plus(p3.ScaledBy(1.0/3));
+        SS.GetEntity(hr.entity(2))->PointForceTo(p1);
+        Vector p2 = p0.ScaledBy(1.0/3).Plus(p3.ScaledBy(2.0/3));
+        SS.GetEntity(hr.entity(3))->PointForceTo(p2);
+    } else if(!leftDown) {
         // Do our usual hit testing, for the selection.
         HitTestMakeSelection(mp);
     }
-    }
 }
 
 bool GraphicsWindow::Selection::Equals(Selection *b) {
@@ -556,6 +559,10 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
     v = v.Plus(projRight.ScaledBy(mx/scale));
     v = v.Plus(projUp.ScaledBy(my/scale));
 
+#define MAYBE_PLACE(p) \
+    if(hover.entity.v && SS.GetEntity((p))->IsPoint()) { \
+        Constraint::ConstrainCoincident(hover.entity, (p)); \
+    }
     hRequest hr;
     switch(pendingOperation) {
         case MNU_DATUM_POINT:
@@ -570,9 +577,7 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
         case MNU_LINE_SEGMENT:
             hr = AddRequest(Request::LINE_SEGMENT);
             SS.GetEntity(hr.entity(1))->PointForceTo(v);
-            if(hover.entity.v && SS.GetEntity(hover.entity)->IsPoint()) {
+            MAYBE_PLACE(hr.entity(1));
-                Constraint::ConstrainCoincident(hover.entity, hr.entity(1));
-            }
 
             ClearSelection(); hover.Clear();
 
@@ -582,12 +587,35 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
             SS.GetEntity(pendingPoint)->PointForceTo(v);
             break;
 
+        case MNU_CUBIC:
+            hr = AddRequest(Request::CUBIC);
+            SS.GetEntity(hr.entity(1))->PointForceTo(v);
+            SS.GetEntity(hr.entity(2))->PointForceTo(v);
+            SS.GetEntity(hr.entity(3))->PointForceTo(v);
+            SS.GetEntity(hr.entity(4))->PointForceTo(v);
+            MAYBE_PLACE(hr.entity(1));
+
+            ClearSelection(); hover.Clear();
+
+            pendingOperation = DRAGGING_NEW_CUBIC_POINT;
+            pendingPoint = hr.entity(4);
+            pendingDescription = "click to place next point of cubic";
+            break;
+
         case DRAGGING_NEW_POINT:
             // The MouseMoved event has already dragged it under the cursor.
             pendingOperation = 0;
             pendingPoint.v = 0;
             break;
 
+        case DRAGGING_NEW_CUBIC_POINT:
+            if(hover.entity.v && SS.GetEntity(hover.entity)->IsPoint()) {
+                Constraint::ConstrainCoincident(pendingPoint, hover.entity);
+            }
+            pendingOperation = 0;
+            pendingPoint.v = 0;
+            break;
+
         case DRAGGING_NEW_LINE_POINT: {
             if(hover.entity.v && SS.GetEntity(hover.entity)->IsPoint()) {
                 Constraint::ConstrainCoincident(pendingPoint, hover.entity);
@@ -614,6 +642,9 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
         case 0:
         default: {
             pendingOperation = 0;
+            pendingPoint.v = 0;
+            pendingConstraint.v = 0;
+            pendingDescription = NULL;
 
             if(hover.IsEmpty()) break;
 

sketch.cpp

@@ -80,6 +80,9 @@ void Request::Generate(IdList<Entity,hEntity> *entity,
 
         case Request::LINE_SEGMENT:
             et = Entity::LINE_SEGMENT;     points = 2; params = 0; goto c;
+
+        case Request::CUBIC:
+            et = Entity::CUBIC;            points = 4; params = 0; goto c;
 c: {
             // Generate the entity that's specific to this request.
             e.type = et;

sketch.h

@@ -106,6 +106,7 @@ public:
     static const int CSYS_2D                = 100;
     static const int DATUM_POINT            = 101;
     static const int LINE_SEGMENT           = 200;
+    static const int CUBIC                  = 300;
 
     int         type;
 
@@ -138,6 +139,7 @@ public:
     static const int POINT_IN_3D            = 2000;
     static const int POINT_IN_2D            = 2001;
     static const int LINE_SEGMENT           = 3000;
+    static const int CUBIC                  = 4000;
     int         type;
 
     bool        symbolic;

ui.h

@@ -98,6 +98,7 @@ public:
         MNU_DATUM_POINT,
         MNU_LINE_SEGMENT,
         MNU_RECTANGLE,
+        MNU_CUBIC,
         // Constrain
         MNU_DISTANCE_DIA,
         MNU_EQUAL,
@@ -154,7 +155,8 @@ public:
     static const int    DRAGGING_POINT              = 0x0f000000;
     static const int    DRAGGING_NEW_POINT          = 0x0f000001;
     static const int    DRAGGING_NEW_LINE_POINT     = 0x0f000002;
-    static const int    DRAGGING_CONSTRAINT      = 0x0f000003;
+    static const int    DRAGGING_NEW_CUBIC_POINT    = 0x0f000003;
+    static const int    DRAGGING_CONSTRAINT         = 0x0f000004;
     hEntity     pendingPoint;
     hConstraint pendingConstraint;
     int         pendingOperation;