diff options
| -rw-r--r-- | pugl/pugl.h | 4 | ||||
| -rw-r--r-- | pugl/pugl_win.c | 45 | ||||
| -rw-r--r-- | test/pugl_test.c | 2 |
3 files changed, 50 insertions, 1 deletions
diff --git a/pugl/pugl.h b/pugl/pugl.h index 59d26fe..3e0578e 100644 --- a/pugl/pugl.h +++ b/pugl/pugl.h @@ -457,6 +457,10 @@ puglInitWindowMinSize(PuglView* view, int width, int height); The x and y values here represent a ratio of width to height. To set a fixed aspect ratio, set the minimum and maximum values to the same ratio. + + Note that setting different minimum and maximum constraints does not + currenty work on MacOS (the minimum is used), so only setting a fixed aspect + ratio works properly across all platforms. */ PUGL_API void puglInitWindowAspectRatio(PuglView* view, diff --git a/pugl/pugl_win.c b/pugl/pugl_win.c index 1c93ea6..b691295 100644 --- a/pugl/pugl_win.c +++ b/pugl/pugl_win.c @@ -634,6 +634,45 @@ stopFlashing(PuglView* view) } } +static void +constrainAspect(const PuglView* const view, + RECT* const size, + const WPARAM wParam) +{ + const float minAspect = view->min_aspect_x / (float)view->min_aspect_y; + const float maxAspect = view->max_aspect_x / (float)view->max_aspect_y; + const int w = size->right - size->left; + const int h = size->bottom - size->top; + const float a = w / (float)h; + + switch (wParam) { + case WMSZ_TOP: + size->top = (a < minAspect ? (LONG)(size->bottom - w * minAspect) : + a > maxAspect ? (LONG)(size->bottom - w * maxAspect) : + size->top); + break; + case WMSZ_TOPRIGHT: + case WMSZ_RIGHT: + case WMSZ_BOTTOMRIGHT: + size->right = (a < minAspect ? (LONG)(size->left + h * minAspect) : + a > maxAspect ? (LONG)(size->left + h * maxAspect) : + size->right); + break; + case WMSZ_BOTTOM: + size->bottom = (a < minAspect ? (LONG)(size->top + w * minAspect) : + a > maxAspect ? (LONG)(size->top + w * maxAspect) : + size->bottom); + break; + case WMSZ_BOTTOMLEFT: + case WMSZ_LEFT: + case WMSZ_TOPLEFT: + size->left = (a < minAspect ? (LONG)(size->right - h * minAspect) : + a > maxAspect ? (LONG)(size->right - h * maxAspect) : + size->left); + break; + } +} + static LRESULT handleMessage(PuglView* view, UINT message, WPARAM wParam, LPARAM lParam) { @@ -661,6 +700,12 @@ handleMessage(PuglView* view, UINT message, WPARAM wParam, LPARAM lParam) RDW_INVALIDATE|RDW_ALLCHILDREN|RDW_INTERNALPAINT| RDW_UPDATENOW); break; + case WM_SIZING: + if (view->min_aspect_x) { + constrainAspect(view, (RECT*)lParam, wParam); + return TRUE; + } + break; case WM_ENTERSIZEMOVE: view->impl->resizing = true; SetTimer(view->impl->hwnd, diff --git a/test/pugl_test.c b/test/pugl_test.c index a609027..f011962 100644 --- a/test/pugl_test.c +++ b/test/pugl_test.c @@ -170,7 +170,7 @@ main(int argc, char** argv) puglInitWindowClass(view, "PuglTest"); puglInitWindowSize(view, 512, 512); puglInitWindowMinSize(view, 256, 256); - puglInitWindowAspectRatio(view, 1, 1, 1, 1); + puglInitWindowAspectRatio(view, 1, 1, 16, 9); puglInitResizable(view, resizable); puglInitWindowHint(view, PUGL_SAMPLES, samples); |