Allow using m (in addition to mm and inch) as base unit.

CHANGELOG.md

@@ -45,12 +45,13 @@ New rendering features:
   * The "Show/hide outlines" button is now independent from "Show/hide edges".
 
 New measurement/analysis features:
+  * New choice for base unit, meters.
   * New command for measuring total length of selected entities,
     "Analyze → Measure Perimeter".
   * New command for measuring center of mass, with live updates as the sketch
     changes, "Analyze → Center of Mass".
   * New option for displaying areas of closed contours.
-  * When selecting a point and a line, projected distance to to current
+  * When selecting a point and a line, projected distance to current
     workplane is displayed.
 
 Other new features:

src/graphicswin.cpp

@@ -75,13 +75,14 @@ const GraphicsWindow::MenuEntry GraphicsWindow::menu[] = {
 { 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
 { 1, N_("Show Snap &Grid"),             Command::SHOW_GRID,        '>',     TC, mView },
 { 1, N_("Use &Perspective Projection"), Command::PERSPECTIVE_PROJ, '`',    TC, mView },
+{ 1, N_("Dimension &Units"),            Command::NONE,             0,       TN, NULL  },
+{ 2, N_("Dimensions in &Inches"),       Command::UNITS_INCHES,     0,       TR, mView },
+{ 2, N_("Dimensions in &Millimeters"),  Command::UNITS_MM,         0,       TR, mView },
+{ 2, N_("Dimensions in M&eters"),       Command::UNITS_METERS,     0,       TR, mView },
 { 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
 { 1, N_("Show &Toolbar"),               Command::SHOW_TOOLBAR,     0,       TC, mView },
 { 1, N_("Show Property Bro&wser"),      Command::SHOW_TEXT_WND,    '\t',    TC, mView },
 { 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
-{ 1, N_("Dimensions in &Inches"),       Command::UNITS_INCHES,     0,       TR, mView },
-{ 1, N_("Dimensions in &Millimeters"),  Command::UNITS_MM,         0,       TR, mView },
-{ 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
 { 1, N_("&Full Screen"),                Command::FULL_SCREEN,      C|F(11), TC, mView },
 
 { 0, N_("&New Group"),                  Command::NONE,             0,       TN, NULL  },
@@ -605,6 +606,12 @@ void GraphicsWindow::MenuView(Command id) {
             SS.GW.EnsureValidActives();
             break;
 
+        case Command::UNITS_METERS:
+            SS.viewUnits = Unit::METERS;
+            SS.ScheduleShowTW();
+            SS.GW.EnsureValidActives();
+            break;
+
         case Command::FULL_SCREEN:
             ToggleFullScreen();
             SS.GW.EnsureValidActives();
@@ -671,12 +678,14 @@ void GraphicsWindow::EnsureValidActives() {
     switch(SS.viewUnits) {
         case Unit::MM:
         case Unit::INCHES:
+        case Unit::METERS:
             break;
         default:
             SS.viewUnits = Unit::MM;
             break;
     }
     RadioMenuByCmd(Command::UNITS_MM, SS.viewUnits == Unit::MM);
+    RadioMenuByCmd(Command::UNITS_METERS, SS.viewUnits == Unit::METERS);
     RadioMenuByCmd(Command::UNITS_INCHES, SS.viewUnits == Unit::INCHES);
 
     ShowTextWindow(SS.GW.showTextWindow);

src/solvespace.cpp

@@ -250,25 +250,29 @@ void SolveSpaceUI::DoLater() {
 }
 
 double SolveSpaceUI::MmPerUnit() {
-    if(viewUnits == Unit::INCHES) {
-        return 25.4;
-    } else {
-        return 1.0;
+    switch(viewUnits) {
+        case Unit::INCHES: return 25.4;
+        case Unit::METERS: return 1000.0;
+        case Unit::MM: return 1.0;
     }
+    return 1.0;
 }
 const char *SolveSpaceUI::UnitName() {
-    if(viewUnits == Unit::INCHES) {
-        return "inch";
-    } else {
-        return "mm";
+    switch(viewUnits) {
+        case Unit::INCHES: return "inch";
+        case Unit::METERS: return "m";
+        case Unit::MM: return "mm";
     }
+    return "";
 }
+
 std::string SolveSpaceUI::MmToString(double v) {
-    if(viewUnits == Unit::INCHES) {
-        return ssprintf("%.*f", afterDecimalInch, v/25.4);
-    } else {
-        return ssprintf("%.*f", afterDecimalMm, v);
+    switch(viewUnits) {
+        case Unit::INCHES: return ssprintf("%.*f", afterDecimalInch, v / 25.4);
+        case Unit::METERS: return ssprintf("%.*f", afterDecimalMm, v / 1000.0);
+        case Unit::MM: return ssprintf("%.*f", afterDecimalMm, v);
     }
+    return "";
 }
 double SolveSpaceUI::ExprToMm(Expr *e) {
     return (e->Eval()) * MmPerUnit();

src/solvespace.h

@@ -151,7 +151,8 @@ DialogChoice LocateImportedFileYesNoCancel(const Platform::Path &filename,
 
 enum class Unit : uint32_t {
     MM = 0,
-    INCHES
+    INCHES,
+    METERS
 };
 
 struct FileFilter;

src/ui.h

@@ -146,6 +146,7 @@ enum class Command : uint32_t {
     SHOW_TEXT_WND,
     UNITS_INCHES,
     UNITS_MM,
+    UNITS_METERS,
     FULL_SCREEN,
     // Edit
     UNDO,