progress at term deadline

Lab6/viewcontext.cpp

@@ -1,11 +1,72 @@
 // - ViewContext Class - 
 
+#include <cmath>
 #include "viewcontext.h"
 
-ViewContext::ViewContext(){
-    compMatrix = new Matrix(3,3);
+ViewContext::ViewContext(int width, int height){
+    compMatrix = new Matrix(4,4);
+    prevTransform = new Matrix(4,4);
 }
 
-void ViewContext::model_to_device(){
+void ViewContext::model_to_device(Matrix* coord){
+    (*coord) = (*compMatrix)*(*coord);
+}
 
-}
+void ViewContext::rotate(int deg){
+    // Store previous transform
+    *prevTransform = *compMatrix;
+    Matrix temp = Matrix::identity(4);
+    // Input transformation
+    temp[0][0] = cos(deg*M_PI/180);
+    temp[0][1] = sin(deg*M_PI/180);
+    temp[1][0] = -sin(deg*M_PI/180);
+    temp[1][0] = cos(deg*M_PI/180);
+    // Add transformation to comp matrix
+    *compMatrix = temp*(*compMatrix);
+}
+    
+    // Scaling - Around center of screen
+void ViewContext::scale(int mult){
+    // Store previous transform
+    *prevTransform = *compMatrix;
+    // Create identity matrix
+    Matrix temp = Matrix::identity(4);
+    // Input transformation
+    temp[0][0] = mult;
+    temp[1][1] = mult;
+    temp[2][2] = mult;
+    // Add transformation to comp matrix
+    *compMatrix = temp*(*compMatrix);
+}
+
+// Translation
+void ViewContext::translate(int dx, int dy, int dz){
+    // Store previous transform
+    *prevTransform = *compMatrix;
+    Matrix temp = Matrix::identity(4);
+    // Input transformation
+    temp[0][3] = dx;
+    temp[1][3] = dy;
+    temp[2][3] = dz;
+    // Add transformation to comp matrix
+    *compMatrix = temp*(*compMatrix);
+}
+// Reset
+void ViewContext::reset(){
+    *compMatrix = (Matrix::identity(4))*(*compMatrix);
+}
+
+// Undo
+void ViewContext::undo(Matrix* coord){
+    // Use temp to store current trans
+    Matrix temp = Matrix::identity(4);
+    
+    (*coord) = (*prevTransform)*(*coord);
+    *prevTransform = temp;
+
+}
+
+// Invert Colors
+// void ViewContext::invert(){
+
+// }