public void DrawFrame(RectangleF rect, float borderWidth, Color color)
{
float half = borderWidth / 2f;
// Outer rectangle
var p1 = new ColoredVertex(rect.Left - half, rect.Top - half, color);
var p2 = new ColoredVertex(rect.Right + half, rect.Top - half, color);
var p3 = new ColoredVertex(rect.Right + half, rect.Bottom + half, color);
var p4 = new ColoredVertex(rect.Left - half, rect.Bottom + half, color);
// Inner rectangle
var p5 = new ColoredVertex(rect.Left + half, rect.Top + half, color);
var p6 = new ColoredVertex(rect.Right - half, rect.Top + half, color);
var p7 = new ColoredVertex(rect.Right - half, rect.Bottom - half, color);
var p8 = new ColoredVertex(rect.Left + half, rect.Bottom - half, color);
ColoredVertex[] data = { p1, p5, p2, p6, p3, p7, p4, p8, p1, p5 };
device.SetTexture(0, null);
DrawColoredVertices(PrimitiveType.TriangleStrip, 8, data);
}
private void DrawColoredVertices(PrimitiveType type, int count, ColoredVertex[] data)
{
using (var declaration = new VertexDeclaration(device, ColoredVertex.VertexElements))
{
device.VertexDeclaration = declaration;
device.DrawUserPrimitives(type, count, data);
}
}