/// <summary>
/// Sets scroll and zoom to center the given rectangle in the client area with a given scale</summary>
/// <param name="adapter">Adapter managing transform</param>
/// <param name="scale">Scale</param>
/// <param name="itemBounds">Rectangle to frame, in client coordinates</param>
/// <param name="clientBounds">Client area</param>
public static void ZoomAboutCenter(this ITransformAdapter adapter, Point scale, Rect itemBounds, Rect clientBounds)
{
if (adapter == null || !adapter.Transform.HasInverse)
{
return;
}
Rect worldBounds = MathUtil.InverseTransform(adapter.Transform, itemBounds);
if (adapter.UniformScale)
{
scale.X = scale.Y = Math.Min(scale.X, scale.Y);
}
scale = TransformAdapters.ConstrainScale(adapter, scale);
// calculate translation needed to put bounds center at center of view
Point worldBoundsCenter = new Point(
worldBounds.X + worldBounds.Width / 2,
worldBounds.Y + worldBounds.Height / 2);
Point translation = new Point(
clientBounds.Width / 2 - worldBoundsCenter.X * scale.X,
clientBounds.Height / 2 - worldBoundsCenter.Y * scale.Y);
adapter.SetTransform(scale.X, scale.Y, translation.X, translation.Y);
}
/// <summary>
/// Sets scroll and zoom so that the largest axis of the given rectangle almost
/// fills the client area</summary>
/// <param name="adapter">Adapter managing transform</param>
/// <param name="itemBounds">Rectangle to frame, in client coordinates</param>
/// <param name="clientBounds">Client area</param>
public static void Frame(this ITransformAdapter adapter, Rect itemBounds, Rect clientBounds)
{
if (adapter == null || itemBounds.IsEmpty || !adapter.Transform.HasInverse)
{
return;
}
Rect worldBounds = MathUtil.InverseTransform(adapter.Transform, itemBounds);
// calculate scale so bounding rectangle (in world coordinates) fills client
// rectangle with some margin around the edges
const double MarginScale = 0.86;
Point scale = new Point(
Math.Abs(clientBounds.Width / worldBounds.Width) * MarginScale,
Math.Abs(clientBounds.Height / worldBounds.Height) * MarginScale);
if (adapter.UniformScale)
{
scale.X = scale.Y = Math.Min(scale.X, scale.Y);
}
scale = TransformAdapters.ConstrainScale(adapter, scale);
// calculate translation needed to put bounds center at center of view
Point worldBoundsCenter = new Point(
worldBounds.X + worldBounds.Width / 2,
worldBounds.Y + worldBounds.Height / 2);
Point translation = new Point(
clientBounds.Width / 2 - worldBoundsCenter.X * scale.X,
clientBounds.Height / 2 - worldBoundsCenter.Y * scale.Y);
adapter.SetTransform(scale.X, scale.Y, translation.X, translation.Y);
}
/// <summary>
/// Sets scroll and zoom so that the largest axis of the given rectangle almost
/// fills the client area</summary>
/// <param name="adapter">Adapter managing transform</param>
/// <param name="bounds">Rectangle to frame, in Windows client coordinates</param>
public static void Frame(this ITransformAdapter adapter, RectangleF bounds)
{
if (bounds.IsEmpty)
{
return;
}
RectangleF worldBounds = GdiUtil.InverseTransform(adapter.Transform, bounds);
// calculate scale so bounding rectangle (in world coordinates) fills client
// rectangle with some margin around the edges
RectangleF clientRect = adapter.AdaptedControl.ClientRectangle;
const float MarginScale = 0.86f;
PointF scale = new PointF(
Math.Abs(clientRect.Width / worldBounds.Width) * MarginScale,
Math.Abs(clientRect.Height / worldBounds.Height) * MarginScale);
if (adapter.UniformScale)
{
scale.X = scale.Y = Math.Min(scale.X, scale.Y);
}
scale = adapter.ConstrainScale(scale);
// calculate translation needed to put bounds center at center of view
PointF worldBoundsCenter = new PointF(
worldBounds.X + worldBounds.Width / 2,
worldBounds.Y + worldBounds.Height / 2);
PointF translation = new PointF(
clientRect.Width / 2 - worldBoundsCenter.X * scale.X,
clientRect.Height / 2 - worldBoundsCenter.Y * scale.Y);
adapter.SetTransform(
scale.X,
scale.Y,
translation.X,
translation.Y);
}
/// <summary>
/// Sets the transform to the given matrix; rotation and skew are ignored</summary>
/// <param name="transformAdapter">Adapter managing transform</param>
/// <param name="transform">Transformation matrix</param>
public static void SetTransform(this ITransformAdapter transformAdapter, Matrix transform)
{
transformAdapter.SetTransform(transform.M11, transform.M22, transform.OffsetX, transform.OffsetY);
}
/// <summary>
/// Sets the transform to the given matrix; rotation and skew are
/// ignored</summary>
/// <param name="transformAdapter">Adapter managing transform</param>
/// <param name="transform">Transformation matrix, from world to Window client coordinates</param>
public static void SetTransform(this ITransformAdapter transformAdapter, Matrix transform)
{
float[] m = transform.Elements;
transformAdapter.SetTransform(m[0], m[3], m[4], m[5]);
}
