Title: See where a parabola and hyperbola intersect in C#

This example shows how to see where a parabola and hyperbola intersect. The previous four-part example "See where two ellipses intersect in C#" explains how to find the points of intersections between two conic sections. You can find that post's pieces here:

• See where two ellipses intersect in C#, Part 1
• See where two ellipses intersect in C#, Part 2
• See where two ellipses intersect in C#, Part 3
• See where two ellipses intersect in C#, Part 4

This example uses the techniques demonstrated by the earlier example to find the points of intersections between a parabola and a hyperbola. This example is similar to the previous one so see them for more information. The big difference in this example is that you cannot click and drag to select ellipses. Instead the program's Load event handler uses the following code to initialize the variables A1, B1, C1, D1, E1, and F1 to define a parabola, and A2, B2, C2, D2, E2, and F2 to define a hyperbola.

private void Form1_Load(object sender, EventArgs e) { this.DoubleBuffered = true; TangentX = 88; // A parabola. float dx = 50; float dy = 100; float sx = 10; float sy = 1; A1 = 0; B1 = 0; C1 = -sy * sy; D1 = sx; E1 = 2 * sy * dy; F1 = -sx * dx - dy * dy; // A hyperbola. dx = HyperbolaXmid; dy = 70; float a2 = 50; float b2 = 150; A2 = 1 / a2; B2 = 0; C2 = -1 / b2; D2 = -2 * dx / a2; E2 = 2 * dy / b2; F2 = (dx * dx / a2) - (dy * dy / b2) - 1; // Perform the calculations. PerformCalculations(); }

Download the example to experiment with it and to see additional details.