/// <summary>
/// Draws the different types of shapes.
/// </summary>
private void DrawStaticShapes(BitmapBuffer writeableBmp)
{
// Wrap updates in a GetContext call, to prevent invalidation and nested locking/unlocking during this block
using (writeableBmp.GetBitmapContext())
{
// Init some size vars
int w = writeableBmp.PixelWidth - 2;
int h = writeableBmp.PixelHeight - 2;
int w3rd = w / 3;
int h3rd = h / 3;
int w6th = w3rd >> 1;
int h6th = h3rd >> 1;
// Clear
writeableBmp.Clear();
// Draw some points
for (int i = 0; i < 200; i++)
{
writeableBmp.SetPixel(rand.Next(w3rd), rand.Next(h3rd), GetRandomColor());
}
// Draw Standard shapes
writeableBmp.DrawLine(rand.Next(w3rd, w3rd * 2), rand.Next(h3rd), rand.Next(w3rd, w3rd * 2), rand.Next(h3rd),
GetRandomColor());
writeableBmp.DrawTriangle(rand.Next(w3rd * 2, w - w6th), rand.Next(h6th), rand.Next(w3rd * 2, w),
rand.Next(h6th, h3rd), rand.Next(w - w6th, w), rand.Next(h3rd),
GetRandomColor());
writeableBmp.DrawQuad(rand.Next(0, w6th), rand.Next(h3rd, h3rd + h6th), rand.Next(w6th, w3rd),
rand.Next(h3rd, h3rd + h6th), rand.Next(w6th, w3rd),
rand.Next(h3rd + h6th, 2 * h3rd), rand.Next(0, w6th), rand.Next(h3rd + h6th, 2 * h3rd),
GetRandomColor());
writeableBmp.DrawRectangle(rand.Next(w3rd, w3rd + w6th), rand.Next(h3rd, h3rd + h6th),
rand.Next(w3rd + w6th, w3rd * 2), rand.Next(h3rd + h6th, 2 * h3rd),
GetRandomColor());
// Random polyline
int[] p = new int[rand.Next(7, 10) * 2];
for (int j = 0; j < p.Length; j += 2)
{
p[j] = rand.Next(w3rd * 2, w);
p[j + 1] = rand.Next(h3rd, 2 * h3rd);
}
writeableBmp.DrawPolyline(p, GetRandomColor());
// Random closed polyline
p = new int[rand.Next(6, 9) * 2];
for (int j = 0; j < p.Length - 2; j += 2)
{
p[j] = rand.Next(w3rd);
p[j + 1] = rand.Next(2 * h3rd, h);
}
p[p.Length - 2] = p[0];
p[p.Length - 1] = p[1];
writeableBmp.DrawPolyline(p, GetRandomColor());
// Ellipses
writeableBmp.DrawEllipse(rand.Next(w3rd, w3rd + w6th), rand.Next(h3rd * 2, h - h6th),
rand.Next(w3rd + w6th, w3rd * 2), rand.Next(h - h6th, h), GetRandomColor());
writeableBmp.DrawEllipseCentered(w - w6th, h - h6th, w6th >> 1, h6th >> 1, GetRandomColor());
// Draw Grid
writeableBmp.DrawLine(0, h3rd, w, h3rd, Colors.Black);
writeableBmp.DrawLine(0, 2 * h3rd, w, 2 * h3rd, Colors.Black);
writeableBmp.DrawLine(w3rd, 0, w3rd, h, Colors.Black);
writeableBmp.DrawLine(2 * w3rd, 0, 2 * w3rd, h, Colors.Black);
// Invalidates on exit of using block
}
}
/// <summary>
/// Draws a quad.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="x1">The x-coordinate of the 1st point.</param>
/// <param name="y1">The y-coordinate of the 1st point.</param>
/// <param name="x2">The x-coordinate of the 2nd point.</param>
/// <param name="y2">The y-coordinate of the 2nd point.</param>
/// <param name="x3">The x-coordinate of the 3rd point.</param>
/// <param name="y3">The y-coordinate of the 3rd point.</param>
/// <param name="x4">The x-coordinate of the 4th point.</param>
/// <param name="y4">The y-coordinate of the 4th point.</param>
/// <param name="color">The color.</param>
public static void DrawQuad(this BitmapBuffer bmp, int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4, ColorInt color)
{
bmp.DrawQuad(x1, y1, x2, y2, x3, y3, x4, y4, color.ToPreMultAlphaColor());
}