ImageEn Forum

Profile Join Active Topics Forum FAQ

All Forums

ImageEn Library for Delphi, C++ and .Net

ImageEn and IEvolution Support Forum

[IEvolution] Rotating vectorial objects

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

View

UserName:

Password:

Format

Message

Emoji

Check here to include your profile signature.
Check here to subscribe to this topic.

T O P I C R E V I E W
Claus.Gerlach	Posted - Jul 24 2012 : 01:30:01 In our application we use your IEViewer-component to label significant parts of a picture by taking advantage of IEAnnotations object. More specifically, we use points (IEObjectEllipse) for that work. After all sometimes it's necessary to rotate the picture. This will be done by using an additional layer and the "EnableRotateLayers"-property. To put the points on the right place I calculated new coordinates of the objects via matrix tranformation for rotation. This worked fine with IEvolution 4.0.1 component. But with version 4.1.2 it doesn't work. It seems that after rotation you use a new coordinate system. Is there a builtin function where I can rotate objects over a free selectable rotation center and free selectable rotation angel? Or is there a method of anchoring objects to a layer, so rotation of layer means also rotation of objects? Best regards Claus Gerlach
5 L A T E S T R E P L I E S (Newest First)
Claus.Gerlach	Posted - Sep 06 2012 : 01:00:39 I solved the problem: Rotation of objects didn't fail because of code (posted here) for matrix transformation. It was a problem of the layers. Using the following code works with IEvolution 4.1.2: //Adjust position of annotations according to rotation angle of image private void btnRotateOK_Click(object sender, EventArgs e) { IELayer layer; //Original code: //ieViewerLeft.Image.LayersRemove(0); //layer = ieViewerLeft.Image.GetLayer(0); //New code: layer = ieViewerLeft.Image.GetLayer(1); int center_of_rotation_x = (int) (layer.RotateCenterX * ieViewerLeft.Image.Width); int center_of_rotation_y = (int) (layer.RotateCenterY * ieViewerLeft.Image.Height); double rotation_angle = layer.Rotate; //Calling a method, where the annotations are rotated via matrix-transformation rotateObjects(ieViewerLeft.Image.Annotations, center_of_rotation_x, center_of_rotation_y, rotation_angle); ieViewerLeft.EnableRotateLayers = false; //New code: ieViewerLeft.Image.LayersRemove(0); //some more code… } Best regards Claus Gerlach
Claus.Gerlach	Posted - Aug 16 2012 : 01:13:06 Hello, now I use this code without having a change in the result. It doesn't work, too: /// <summary> /// rotate objects over given rotation center and rotation angle /// </summary> /// <param name="objects"></param> /// <param name="drehpunkt_x"></param> /// <param name="drehpunkt_y"></param> /// <param name="drehwinkel_grad"></param> private void dreheObjekte(IEAnnotations objects, int drehpunkt_x, int drehpunkt_y, double drehwinkel_grad) { // transform rotation angle from degree to radians double winkel = drehwinkel_grad / 180 * Math.PI; for (int i = 0; i < objects.ObjectsCount; i++) { IEObject obj = objects.GetObjectFromIndex(i); IERect rect = obj.Rect; int width_alt = rect.Rectangle.Width; int height_alt = rect.Rectangle.Height; // moving coordinates in order to put rotation center to origin point rect.Left = rect.Left - drehpunkt_x; rect.Top = rect.Top - drehpunkt_y; // processing the matrix transformation int x_alt = rect.Left; int y_alt = rect.Top; rect.Left = (int)(x_alt * Math.Cos(winkel) + y_alt * Math.Sin(winkel)); rect.Top = (int)(-x_alt * Math.Sin(winkel) + y_alt * Math.Cos(winkel)); // moving coordinates back rect.Left = rect.Left + drehpunkt_x; rect.Top = rect.Top + drehpunkt_y; rect.Right = rect.Left + width_alt; rect.Bottom = rect.Top + height_alt; obj.Rect = rect; } }
fab	Posted - Jul 30 2012 : 13:03:49 Coordinate system has not been changed in 4.1.2. Instead of set obj.Left and obj.Top you could try to retrieve the object rect using obj.Rect, set top-left coordinates and re-set obj.Rect with the new rectangle: IERect objRect = obj.Rect; ...rotate objRect rectangle... obj.Rect = objRect;
Claus.Gerlach	Posted - Jul 26 2012 : 04:13:44 /// <summary> /// rotate objects over given rotation center and rotation angle /// </summary> /// <param name="objects"></param> /// <param name="drehpunkt_x"></param> /// <param name="drehpunkt_y"></param> /// <param name="drehwinkel_grad"></param> private void dreheObjekte(IEAnnotations objects, int drehpunkt_x, int drehpunkt_y, double drehwinkel_grad) { // transform rotation angle from degree to radians double winkel = drehwinkel_grad / 180 * Math.PI; for (int i = 0; i < objects.ObjectsCount; i++) { IEObject obj = objects.GetObjectFromIndex(i); // moving coordinates in order to put rotation center to origin point obj.Left = obj.Left - drehpunkt_x; obj.Top = obj.Top - drehpunkt_y; // processing the matrix transformation int x_alt = obj.Left; int y_alt = obj.Top; obj.Left = (int) (x_alt * Math.Cos(winkel) + y_alt * Math.Sin(winkel)); obj.Top = (int) (-x_alt * Math.Sin(winkel) + y_alt * Math.Cos(winkel)); // moving coordinates back obj.Left = obj.Left + drehpunkt_x; obj.Top = obj.Top + drehpunkt_y; } }
fab	Posted - Jul 26 2012 : 01:08:52 Please could you show the code used to rotate objects?