add aspect ratio getter

Author: nmwsharp

include/polyscope/view.h

@@ -91,6 +91,7 @@ void getCameraFrame(glm::vec3& lookDir, glm::vec3& upDir, glm::vec3& rightDir);
 glm::vec3 getUpVec();
 glm::vec3 getFrontVec();
 float getVerticalFieldOfViewDegrees();
+float getAspectRatioWidthOverHeight();
 
 // Set the camera extrinsics to look at a particular location
 void setViewToCamera(const CameraParameters& p);

src/view.cpp

@@ -633,6 +633,8 @@ void setVerticalFieldOfViewDegrees(float newVal) {
 
 float getVerticalFieldOfViewDegrees() { return view::fov; }
 
+float getAspectRatioWidthOverHeight() { return (float)bufferWidth / bufferHeight; }
+
 glm::mat4 getCameraPerspectiveMatrix() {
   double farClip = farClipRatio * state::lengthScale;
   double nearClip = nearClipRatio * state::lengthScale;