I am working on a Winform program, and I can't believe there isn't an easier way to accomplish what I'm trying.
Basically, I want to display an image that will always be 640x480. Then, I want to have another control on top of it that is nothing more than a selection area that the user can change its size & location inside that 640x480 area, and it will report back its pixel size & x/y location.
Short of drawing all of the lines by hand and adding grips by hand, I can't seem to find an easy way to do this. Am I overlooking something?
Basically, I want to display an image that will always be 640x480. Then, I want to have another control on top of it that is nothing more than a selection area that the user can change its size & location inside that 640x480 area, and it will report back its pixel size & x/y location.
Short of drawing all of the lines by hand and adding grips by hand, I can't seem to find an easy way to do this. Am I overlooking something?
2 Answers, 1 is accepted
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NOAH
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answered on 14 Jan 2014, 03:00 PM
Apparently what I'm looking for is referred to by Microsoft as a Rubber Band Rectangle... I still have not found a simple solution to use a control for this.
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Hi Noah,
Thank you for contacting us.
We do not have such a control in our suite so far. We do have a feature request for image editor control which seems to be related. If you find it useful, feel free to vote for it here: http://www.telerik.com/support/pits.aspx#/details/Issue=15947.
However, you can easily implement a custom control which can support the Rubber Band Selection. I have made a small example of such control. Here is the code for it:
You can drag it on a form, setup its BackgroudImage property and start making rectangles.
I hope this helps.
Regards,
George
Telerik
Thank you for contacting us.
We do not have such a control in our suite so far. We do have a feature request for image editor control which seems to be related. If you find it useful, feel free to vote for it here: http://www.telerik.com/support/pits.aspx#/details/Issue=15947.
However, you can easily implement a custom control which can support the Rubber Band Selection. I have made a small example of such control. Here is the code for it:
[Browsable(true)]public class RubberBandSelectionControl : RadControl{ private RubberBandSelectionElement rubberBandSelectionElement; protected override void CreateChildItems(RadElement parent) { this.rubberBandSelectionElement = new RubberBandSelectionElement(); parent.Children.Add(this.rubberBandSelectionElement); } protected override Size DefaultSize { get { return new Size(200, 300); } }}public class RubberBandSelectionElement : LightVisualElement{ private bool isMouseDown; private Point startingPoint; private Point currentPoint; protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); if (e.Button == MouseButtons.Left) { this.isMouseDown = true; this.startingPoint = Control.MousePosition; } } protected override void OnMouseUp(MouseEventArgs e) { base.OnMouseUp(e); this.isMouseDown = false; this.currentPoint = Point.Empty; } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (this.isMouseDown) { if (this.currentPoint != Point.Empty) { this.DrawRectangle(this.startingPoint, this.currentPoint); } this.currentPoint = Control.MousePosition; this.DrawRectangle(this.startingPoint, this.currentPoint); } } private void DrawRectangle(Point startingPoint, Point endingPoint) { Rectangle rect = new Rectangle(); if (startingPoint.X < endingPoint.X) { rect.X = startingPoint.X; rect.Width = endingPoint.X - startingPoint.X; } else { rect.X = endingPoint.X; rect.Width = startingPoint.X - endingPoint.X; } if (startingPoint.Y < endingPoint.Y) { rect.Y = startingPoint.Y; rect.Height = endingPoint.Y - startingPoint.Y; } else { rect.Y = endingPoint.Y; rect.Height = startingPoint.Y - endingPoint.Y; } ControlPaint.DrawReversibleFrame(rect, Color.Black, FrameStyle.Dashed); }}You can drag it on a form, setup its BackgroudImage property and start making rectangles.
I hope this helps.
Regards,
George
Telerik
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