README-en.md edited online with Bitbucket

README-en.md

@@ -142,28 +142,28 @@ To plot a curve that is described by parametric equations, we compute the $$x$$
 
 3. The file `main.cpp` (in Sources) contains the function `main()` where you will be adding code. Open this file and study the code.  
 
-        QApplication a(argc, argv);
-        XYPlotWindow wLine;
-        XYPlotWindow wCircle;
-        XYPlotWindow wHeart;
-        XYPlotWindow wButterfly;
-
-        double y = 0.00;
-        double x = 0.00;
-        double increment = 0.01;
+        	QApplication a(argc, argv);
+        	XYPlotWindow wLine;
+        	XYPlotWindow wCircle;
+        	XYPlotWindow wHeart;
+        	XYPlotWindow wButterfly;
+
+        	double y = 0.00;
+        	double x = 0.00;
+        	double increment = 0.01;
     
-        for (double t = 0; t < 2*M_PI; t = t + increment) {
-            // parametric equations
-            x = t;
-            y = t;
-
-            // add x and y as a point in the graph
-            wLine.AddPointToGraph(x,y);
-        }
-
-        // After all the points have been added, plot and show the graph
-        wLine.Plot();
-        wLine.show();
+        	for (double t = 0; t < 2*M_PI; t = t + increment) {
+            	// parametric equations
+            	x = t;
+            	y = t;
+
+            	// add x and y as a point in the graph
+            	wLine.AddPointToGraph(x,y);
+        	}
+
+        	// After all the points have been added, plot and show the graph
+        	wLine.Plot();
+        	wLine.show();
     
     The line  `XYPlotWindow wLine;` creates the object `wLine`, that is the window that will show the plot of a graph, in this case the graph of a segment. Look at the `for` loop. In this cycle several values for $$t$$ are generated and a value for $$x$$ and $$y$$ is computed for each $$t$$. Each ordered pair $$(x,y)$$ is added to the graph of the segment by the method `AddPointToGraph(x,y)`.  After the cycle, there is a call to the  method  `Plot()`, to "draw" the points on the graph, and to the method `show()`, to show the plot. The *methods* are functions that allow us to work with the data of an object. Note that each of the methods is written after `wLine`, and followed by a period. In a future laboratory experience you will learn more about objects and practice how to create them and invoke their methods.