Rotating and Flipping a bitmap

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I am converting a VB6 program to VB.NET. This program takes sign data from graphics programs and displays the sign in a picturebox and allow the user to select the different points around the Letters in the sign. I am drawing the sign but when I try and locate the points is where I am having a problem. Since the sign is drawn upside down and then flipped the points are not where I am clicking on the picture box. Can you provide any help so that when I click on a point on the letter the x and y are the same as what was loaded.

Thanks

Posted 21-Dec-13 10:15am

jmbooher

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BillWoodruff 21-Dec-13 19:04pm

Why not ... for the purpose of allowing the user to pick the points on the graphic content ... display the bitmap un-rotated, and un-flipped ?

jmbooher 25-Dec-13 9:50am

If I did that the sign would then be presented to the customer upside down. This is software that operates a machine and the customer needs to be able to select a starting and ending point for each letter in the sign.

3 solutions

Solution 2

First of all, please see my recent answer which should convince you not to use PictureBox: add elements on existing bitmap[^].

And to Solution 1 by Bill explains you what you can do with a bitmap. Of course, you can do a lot more. :-)

—SA

Posted 21-Dec-13 18:24pm

Sergey Alexandrovich Kryukov

Solution 3

To rotate Image use this code on a button_click event:

VB

pictureBox1 .Image.RotateFlip(RotateFlipType.Rotate90FlipNone)
pictureBox1.Refresh()

Posted 23-Dec-13 4:45am

Zahid Khan Kakar

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BillWoodruff · Accepted Answer · 2013-12-21T13:44:00

Assuming the image you have to work with is rotated on both x- and y- axes ... in other words, it's a "mirror image."

In C#: Button 'btnFlipXY, and PictureBox 'pbxImage on a Form. PictureBox 'SizeMode Property set to 'AutoSize

C#

// required
using System.Drawing;

// Click EventHandler for 'btnFlipXY
private void btnFlipXY_Click(object sender, EventArgs e)
{
   Bitmap theImage = pbxImage.Image as Bitmap;
   theImage.RotateFlip(RotateFlipType.RotateNoneFlipXY);
   pbxImage.Image = theImage;
}

Click the Button once and select the Points, and store the Points in whatever data-structure you've chosen. Click a second time, and the image is restored to its original orientation.

In VB.NET WinForms:

VB

Private Sub btnFlipXY_Click(sender As Object, e As EventArgs) Handles btnFlipXY.Click

    Dim theImage
    theImage = pbxImage.Image

    theImage.RotateFlip(RotateFlipType.RotateNoneFlipXY)
    pbxImage.Image = theImage

End Sub

This is the first time I have ever coded in VB, so I don't know why a conversion of the PictureBox.Image to Type 'Bitmap is not required in VB. A quick search on the web suggests this declaration would be better:

Dim theImage As New Bitmap(pbxImage.Image)