Implement "view → set to full scale" text window command.

CHANGELOG.md

@@ -11,6 +11,8 @@ New export/import features:
 Other new features:
   * New command for measuring total length of selected entities,
     "Analyze → Measure Perimeter".
+  * New link to match the on-screen size of the sketch with its actual size,
+    "view → set to full scale".
 
 2.2
 ---

res/win32/manifest.xml

@@ -6,6 +6,11 @@
     name="JonathanWesthues.3dCAD.SolveSpace"
     type="win32"
 />
+<application xmlns="urn:schemas-microsoft-com:asm.v3">
+  <windowsSettings>
+    <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
+  </windowsSettings>
+</application>
 <description>Parametric 3d CAD tool.</description>
 <dependency>
     <dependentAssembly>

src/platform/cocoamain.mm

@@ -1045,6 +1045,15 @@ void GetTextWindowSize(int *w, int *h) {
     *h = (int)size.height;
 }
 
+double GetScreenDpi() {
+    NSScreen *screen = [NSScreen mainScreen];
+    NSDictionary *description = [screen deviceDescription];
+    NSSize displayPixelSize = [[description objectForKey:NSDeviceSize] sizeValue];
+    CGSize displayPhysicalSize = CGDisplayScreenSize(
+                [[description objectForKey:@"NSScreenNumber"] unsignedIntValue]);
+    return (displayPixelSize.width / displayPhysicalSize.width) * 25.4f;
+}
+
 void InvalidateText(void) {
     NSSize size = [TWView convertSizeToBacking:[TWView frame].size];
     size.height = (SS.TW.top[SS.TW.rows - 1] + 1) * TextWindow::LINE_HEIGHT / 2;

src/platform/gtkmain.cpp

@@ -1420,6 +1420,10 @@ void GetTextWindowSize(int *w, int *h) {
     *h = allocation.get_height();
 }
 
+double GetScreenDpi() {
+    return Gdk::Screen::get_default()->get_resolution();
+}
+
 void InvalidateText(void) {
     TW->get_widget().queue_draw();
 }

src/platform/headless.cpp

@@ -96,6 +96,9 @@ void ScheduleLater() {
 void GetGraphicsWindowSize(int *w, int *h) {
     *w = *h = 600;
 }
+double GetScreenDpi() {
+    return 72;
+}
 
 void InvalidateGraphics() {
 }

src/platform/w32main.cpp

@@ -266,6 +266,13 @@ void SolveSpace::GetTextWindowSize(int *w, int *h)
     GetWindowSize(TextWnd, w, h);
 }
 
+double SolveSpace::GetScreenDpi() {
+    HDC hdc = GetDC(NULL);
+    double dpi = GetDeviceCaps(hdc, LOGPIXELSX);
+    ReleaseDC(NULL, hdc);
+    return dpi;
+}
+
 void SolveSpace::OpenWebsite(const char *url) {
     ShellExecuteW(GraphicsWnd, L"open", Widen(url).c_str(), NULL, NULL, SW_SHOWNORMAL);
 }

src/solvespace.h

@@ -264,6 +264,7 @@ void ToggleFullScreen();
 bool FullScreenIsActive();
 void GetGraphicsWindowSize(int *w, int *h);
 void GetTextWindowSize(int *w, int *h);
+double GetScreenDpi();
 int64_t GetMilliseconds();
 
 void dbp(const char *str, ...);

src/ui.h

@@ -457,6 +457,7 @@ public:
     static void ScreenChangeBackgroundImageScale(int link, uint32_t v);
     static void ScreenChangePasteTransformed(int link, uint32_t v);
     static void ScreenChangeViewScale(int link, uint32_t v);
+    static void ScreenChangeViewToFullScale(int link, uint32_t v);
     static void ScreenChangeViewOrigin(int link, uint32_t v);
     static void ScreenChangeViewProjection(int link, uint32_t v);
 

src/view.cpp

@@ -14,6 +14,8 @@ void TextWindow::ShowEditView() {
         SS.GW.scale * SS.MmPerUnit(),
         SS.UnitName(),
         &ScreenChangeViewScale);
+    Printf(false, "%Bd   %Fl%Ll%fset to full scale%E",
+        &ScreenChangeViewToFullScale);
     Printf(false, "");
 
     Printf(false, "%Bd %Ftorigin (maps to center of screen)%E");
@@ -42,6 +44,10 @@ void TextWindow::ScreenChangeViewScale(int link, uint32_t v) {
     SS.TW.ShowEditControl(3, ssprintf("%.3f", SS.GW.scale * SS.MmPerUnit()));
 }
 
+void TextWindow::ScreenChangeViewToFullScale(int link, uint32_t v) {
+    SS.GW.scale = GetScreenDpi() / 25.4;
+}
+
 void TextWindow::ScreenChangeViewOrigin(int link, uint32_t v) {
     std::string edit_value =
         ssprintf("%s, %s, %s",