Fix stretching/squashing with non-square window

TODO.md

@@ -1,8 +1,8 @@
 # Before 1.0
 
 ## graphics
-- prevent stretching from window aspect ratio
 - smoothing
+- framerate counter
 
 ## docs
 - model format documentation

src/graphics.cpp

@@ -24,11 +24,14 @@
 GLuint shader;	//standard shader program used for all elements
 GLuint transUniform;	//location of the "transMatrix" transformation matrix uniform in the shader
 
+float windowAspectRatio;
+
 //parts of the model (see modelpart.hpp)
 Model* model;
 
 void display () {
 	glClear(GL_COLOR_BUFFER_BIT);
+	windowAspectRatio =  glutGet(GLUT_WINDOW_WIDTH) / (float)glutGet(GLUT_WINDOW_HEIGHT);
 
 	model->draw();
 

src/graphics.hpp

@@ -12,6 +12,7 @@
 #include <cv.hpp>
 
 extern GLuint transUniform;
+extern float windowAspectRatio;
 
 void initGraphics ();
 

src/modelpart.cpp

@@ -41,7 +41,8 @@ void ModelPart::setFollowTarget(std::string followTarget) {
 }
 
 void ModelPart::setTransform(glm::vec2 position, float rotation, float scale) {
-	transMatrix = glm::translate(glm::mat4(1.0f), glm::vec3(position.x, -position.y, 0.0f) + glm::vec3(posOffset, 0.0f));
+	transMatrix = glm::ortho(-windowAspectRatio, windowAspectRatio, -1.0f, 1.0f);
+	transMatrix = glm::translate(transMatrix, glm::vec3(position.x, -position.y, 0.0f) + glm::vec3(posOffset, 0.0f));
 	transMatrix = glm::rotate(transMatrix, rotation * rotFactor, glm::vec3(0.0f, 0.0f, 1.0f));
 	transMatrix = glm::scale(transMatrix, glm::vec3(1,1,1) + (scale - 1 + glm::vec3(scaleOffset, 0.0f)) * scaleFactor);
 	transMatrix = glm::translate(transMatrix, glm::vec3(-origin, 0.0f));