From f7f73bc900ad46d296780d5187daa74006ed1b4d Mon Sep 17 00:00:00 2001
From: Jonathan Westhues <jwesthues@cq.cx>
Date: Tue, 29 Sep 2009 04:31:07 -0800
Subject: [PATCH] Change the unregistered behavior: instead of limiting the
 number of constraints, print a message in anything that we export.

[git-p4: depot-paths = "//depot/solvespace/": change = 2038]
---
 constraint.cpp | 15 ---------------
 export.cpp     | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/constraint.cpp b/constraint.cpp
index 0fae97b..ee70440 100644
--- a/constraint.cpp
+++ b/constraint.cpp
@@ -103,21 +103,6 @@ void Constraint::ConstrainCoincident(hEntity ptA, hEntity ptB) {
 }
 
 void Constraint::MenuConstrain(int id) {
-    int nt = 0;
-    Constraint *ct;
-    for(ct = SK.constraint.First(); ct; ct = SK.constraint.NextAfter(ct)) {
-        if(ct->type != POINTS_COINCIDENT) nt++;
-    }
-    if(nt > 25) {
-        if((!SS.license.licensed) && SS.license.trialDaysRemaining <= 0) {
-            Error("The 90-day trial of SolveSpace has expired, and the light "
-                  "version does not support more than 25 constraints in a "
-                  "single file.\r\n\r\n"
-                  "Choose Help -> Website / Manual to purchase a license.");
-            return;
-        }
-    }
-
     Constraint c;
     ZERO(&c);
     c.group = SS.GW.activeGroup;
diff --git a/export.cpp b/export.cpp
index 998ff99..8a872b3 100644
--- a/export.cpp
+++ b/export.cpp
@@ -369,6 +369,12 @@ VectorFileWriter *VectorFileWriter::ForFile(char *filename) {
     return ret;
 }
 
+static void AddUnregMessageCallback(void *fndata, Vector a, Vector b)
+{
+    SEdgeList *sel = (SEdgeList *)fndata;
+    sel->AddEdge(a, b, Style::SELECTED);
+}
+
 void VectorFileWriter::Output(SEdgeList *sel, SBezierList *sbl, SMesh *sm) {
     STriangle *tr;
     SEdge *e;
@@ -415,6 +421,38 @@ void VectorFileWriter::Output(SEdgeList *sel, SBezierList *sbl, SMesh *sm) {
         ptMax.y = ptMin.y + (s*SS.exportCanvas.height);
     }
 
+    // If the demo period has expired and there's no license, then print
+    // a message in any exported file.
+    if((!SS.license.licensed) && (SS.license.trialDaysRemaining <= 0)) {
+        char *str = 
+            "eval / nonprofit use only -- buy at http://solvespace.com/";
+        double aspect = (glxStrWidth(str, 1) / glxStrHeight(1));
+        double w = ptMax.x - ptMin.x, h = ptMax.y - ptMin.y;
+        Vector u, v, t;
+        double th;
+        if(w > h) {
+            th = w / aspect;
+            u = Vector::From(1, 0, 0);
+            v = Vector::From(0, 1, 0);
+            t = Vector::From(ptMin.x + (w/2), ptMin.y - 1.5*th, 0);
+        } else {
+            th = h / aspect;
+            u = Vector::From( 0, 1, 0);
+            v = Vector::From(-1, 0, 0);
+            t = Vector::From(ptMax.x + 1.5*th, ptMin.y + (h/2) , 0);
+        }
+        glxWriteTextRefCenter(
+            str,
+            0.9 * th * SS.GW.scale,
+            t, u, v,
+            AddUnregMessageCallback, sel);
+        if(w > h) {
+            ptMin.y -= th*3;
+        } else {
+            ptMax.x += th*3;
+        }
+    }
+
     StartFile();
     if(sm && SS.exportShadedTriangles) {
         for(tr = sm->l.First(); tr; tr = sm->l.NextAfter(tr)) {