Add routines to draw a vector font (public domain Hershey Simplex

font, not bad). Use that to label the planes now.

[git-p4: depot-paths = "//depot/solvespace/": change = 1660]

Makefile

@@ -15,6 +15,7 @@ SSOBJS   = $(OBJDIR)\solvespace.obj \
            $(OBJDIR)\util.obj \
            $(OBJDIR)\entity.obj \
            $(OBJDIR)\sketch.obj \
+           $(OBJDIR)\glhelper.obj \
 
 
 LIBS = user32.lib gdi32.lib comctl32.lib advapi32.lib opengl32.lib glu32.lib

dsc.h

@@ -27,8 +27,6 @@ public:
     static Vector RotationU(double a, double b, double c, double d);
     static Vector RotationV(double a, double b, double c, double d);
 };
-void glVertex3v(Vector u);
-
 
 class Point2d {
 public:

entity.cpp

@@ -1,5 +1,12 @@
 #include "solvespace.h"
 
+void Entity::LineDrawHitTest(Vector a, Vector b) {
+    glBegin(GL_LINE_STRIP);
+        glxVertex3v(a);
+        glxVertex3v(b);
+    glEnd();
+}
+
 void Entity::Draw(void) {
     switch(type) {
         case CSYS_2D: {
@@ -17,15 +24,27 @@ void Entity::Draw(void) {
 
             double s = (min(SS.GW.width, SS.GW.height))*0.4;
 
-            u = u.ScaledBy(s);
+            Vector pp = (p.Plus(u)).Plus(v);
-            v = v.ScaledBy(s);
+            Vector pm = (p.Plus(u)).Minus(v);
+            Vector mm = (p.Minus(u)).Minus(v);
+            Vector mp = (p.Minus(u)).Plus(v);
+            pp = pp.ScaledBy(s);
+            pm = pm.ScaledBy(s);
+            mm = mm.ScaledBy(s);
+            mp = mp.ScaledBy(s);
+
+            LineDrawHitTest(pp, pm);
+            LineDrawHitTest(pm, mm);
+            LineDrawHitTest(mm, mp);
+            LineDrawHitTest(mp, pp);
+
+            Request *r = SS.request.FindById(this->request());
+            glPushMatrix();
+                glxTranslatev(mm);
+                glxOntoCsys(u, v);
+                glxWriteText(r->name.str);
+            glPopMatrix();
 
-            Vector r;
-            glBegin(GL_LINE_LOOP);
-                r = p; r = r.Minus(v); r = r.Minus(u); glVertex3v(r);
-                r = p; r = r.Plus(v);  r = r.Minus(u); glVertex3v(r);
-                r = p; r = r.Plus(v);  r = r.Plus(u);  glVertex3v(r);
-                r = p; r = r.Minus(v); r = r.Plus(u);  glVertex3v(r);
             glEnd();
             break;
         }

glhelper.cpp

@@ -0,0 +1,56 @@
+#include "solvespace.h"
+
+// A public-domain Hershey vector font ("Simplex").
+#include "font.table"
+
+void glxWriteText(char *str)
+{
+    double scale = 0.7/SS.GW.scale;
+    int xo = 5;
+    int yo = 5;
+    
+    for(; *str; str++) {
+        int c = *str;
+        if(c < 32 || c > 126) c = 32;
+
+        c -= 32;
+
+        glBegin(GL_LINE_STRIP);
+        int j;
+        for(j = 0; j < Font[c].points; j++) {
+            int x = Font[c].coord[j*2];
+            int y = Font[c].coord[j*2+1];
+
+            if(x == PEN_UP && y == PEN_UP) {
+                glEnd();
+                glBegin(GL_LINE_STRIP);
+            } else {
+                glVertex3d((xo + x)*scale, (yo + y)*scale, 0);
+            }
+        }
+        glEnd();
+
+        xo += Font[c].width;
+    }
+}
+
+void glxVertex3v(Vector u)
+{
+    glVertex3f((GLfloat)u.x, (GLfloat)u.y, (GLfloat)u.z);
+}
+
+void glxTranslatev(Vector u)
+{
+    glTranslated((GLdouble)u.x, (GLdouble)u.y, (GLdouble)u.z);
+}
+
+void glxOntoCsys(Vector u, Vector v)
+{
+    double mat[16];
+    Vector n = u.Cross(v);
+    MakeMatrix(mat,     u.x, v.x, n.x, 0,
+                        u.y, v.y, n.y, 0,
+                        u.z, v.z, n.z, 0,
+                        0,   0,   0,   1);
+    glMultMatrixd(mat);
+}

graphicswin.cpp

@@ -76,13 +76,14 @@ void GraphicsWindow::MouseMoved(double x, double y, bool leftDown,
             projDown = orig.projDown.RotatedAbout(orig.projRight, s*dy);
 
             NormalizeProjectionVectors();
-
-            orig.projRight = projRight;
-            orig.projDown = projDown;
-            orig.mouse.x = x;
-            orig.mouse.y = y;
         }
 
+        orig.projRight = projRight;
+        orig.projDown = projDown;
+        orig.offset = offset;
+        orig.mouse.x = x;
+        orig.mouse.y = y;
+
         Invalidate();
     }
 }
@@ -142,7 +143,11 @@ void GraphicsWindow::Paint(int w, int h) {
                     0,              0,              0,              1);
     glMultMatrixd(mat);
 
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_BLEND);
+    glEnable(GL_LINE_SMOOTH);
     glEnable(GL_DEPTH_TEST); 
+    glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
 
     glClearIndex((GLfloat)0);
     glClearDepth(1.0); 

sketch.h

@@ -97,11 +97,14 @@ public:
 
     Expr        *expr[16];
 
+    inline hRequest request(void)
+        { hRequest r; r.v = (this->h.v >> 11); return r; }
     inline hParam param(int i)
         { hParam r; r.v = ((this->h.v) << 8) | i; return r; }
     inline hPoint point(int i)
         { hPoint r; r.v = ((this->h.v) << 8) | i; return r; }
 
+    void LineDrawHitTest(Vector a, Vector b);
     void Draw(void);
 };
 

solvespace.cpp

@@ -36,15 +36,15 @@ void SolveSpace::Init(void) {
     r.type = Request::CSYS_2D;
     r.group = Group::HGROUP_REFERENCES;
 
-    r.name.strcpy("__xy_plane");
+    r.name.strcpy("#xy-plane");
     r.h = Request::HREQUEST_REFERENCE_XY;
     request.Add(&r);
 
-    r.name.strcpy("__yz_plane");
+    r.name.strcpy("#yz-plane");
     r.h = Request::HREQUEST_REFERENCE_YZ;
     request.Add(&r);
 
-    r.name.strcpy("__zx_plane");
+    r.name.strcpy("#zx-plane");
     r.h = Request::HREQUEST_REFERENCE_ZX;
     request.Add(&r);
 
@@ -69,8 +69,8 @@ void SolveSpace::Solve(void) {
         double a, b, c, d;
     } Quat[] = {
         { Request::HREQUEST_REFERENCE_XY, 1,    0,    0,    0, },
-        { Request::HREQUEST_REFERENCE_YZ, 0.5,  0.5,  0.5,  0.5, },
+        { Request::HREQUEST_REFERENCE_YZ, 0.5, -0.5, -0.5, -0.5, },
-        { Request::HREQUEST_REFERENCE_ZX, 0.5, -0.5, -0.5, -0.5, },
+        { Request::HREQUEST_REFERENCE_ZX, 0.5,  0.5,  0.5,  0.5, },
     };
     for(i = 0; i < 3; i++) {
         hEntity he;

solvespace.h

@@ -27,8 +27,14 @@ class Expr;
 #include "sketch.h"
 #include "expr.h"
 
+// From the platform-specific code.
 void Invalidate(void);
 
+// Utility functions that are provided in the platform-independent code.
+void glxVertex3v(Vector u);
+void glxWriteText(char *str);
+void glxTranslatev(Vector u);
+void glxOntoCsys(Vector u, Vector v);
 
 
 #define arraylen(x) (sizeof((x))/sizeof((x)[0]))

util.cpp

@@ -160,7 +160,4 @@ Vector Vector::ScaledBy(double v) {
     return r;
 }
 
-void glVertex3v(Vector u)
+
-{
-    glVertex3f((GLfloat)u.x, (GLfloat)u.y, (GLfloat)u.z);
-}

win32/w32main.cpp

@@ -247,7 +247,7 @@ static HGLRC CreateGlContext(HDC hdc)
     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL |  
                         PFD_DOUBLEBUFFER; 
     pfd.dwLayerMask = PFD_MAIN_PLANE; 
-    pfd.iPixelType = PFD_TYPE_COLORINDEX; 
+    pfd.iPixelType = PFD_TYPE_RGBA; 
     pfd.cColorBits = 8; 
     pfd.cDepthBits = 16; 
     pfd.cAccumBits = 0;