Graphics.TransformPoints Method (CoordinateSpace, CoordinateSpace, PointF[])
Transforms an array of points from one coordinate space to another using the current world and page transformations of this Graphics.
Assembly: System.Drawing (in System.Drawing.dll)
public void TransformPoints( CoordinateSpace destSpace, CoordinateSpace srcSpace, PointF[] pts )
Parameters
- destSpace
-
Type:
System.Drawing.Drawing2D.CoordinateSpace
Member of the CoordinateSpace enumeration that specifies the destination coordinate space.
- srcSpace
-
Type:
System.Drawing.Drawing2D.CoordinateSpace
Member of the CoordinateSpace enumeration that specifies the source coordinate space.
- pts
-
Type:
System.Drawing.PointF[]
Array of PointF structures that represent the points to transform.
The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. The code performs the following actions:
Creates two points and draws a blue line between them.
Sets the world transform to translate by amounts 40 in the x direction and 30 in the y direction.
Transforms the points from world coordinates (World) to page coordinates (Page).
Resets the world transformation to the identity and draws a red line between the transformed points.
The result is a blue line and a translated red line below it.
private void TransformPointsPointF(PaintEventArgs e) { // Create array of two points. PointF[] points = { new PointF(0.0F, 0.0F), new PointF(100.0F, 50.0F) }; // Draw line connecting two untransformed points. e.Graphics.DrawLine(new Pen(Color.Blue, 3), points[0], points[1]); // Set world transformation of Graphics object to translate. e.Graphics.TranslateTransform(40.0F, 30.0F); // Transform points in array from world to page coordinates. e.Graphics.TransformPoints(CoordinateSpace.Page, CoordinateSpace.World, points); // Reset world transformation. e.Graphics.ResetTransform(); // Draw line that connects transformed points. e.Graphics.DrawLine(new Pen(Color.Red, 3), points[0], points[1]); }
Available since 1.1