create 2d barcode vb.net If horizontally, determine the resulting height and center the rectangle in the available space. in C#

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If horizontally, determine the resulting height and center the rectangle in the available space.
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If vertically, determine the resulting width and center the rectangle in the available space.
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Return the calculated result.
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Since this algorithm is a bit off-topic from Windows Forms development, we will not discuss it in much detail. This gives us a mechanism for scaling our image to the proper display size, and accounts for both horizontal and vertical images. The method returns a Rectangle object containing both a location and a size for the new image. That is, this method does not just provide the final size for our displayed image; it also provides the location where it should appear within the target rectangle. With this in hand, let s turn back to our MyPhotos application. To implement our Scale to Fit menu, we need to add the menu item itself, the menu-handling logic, and the appropriate drawing code. We will begin with the menu option.
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ADD SCALETOFIT MENU ITEM Action 7 In the MainForm.cs [Design] window, add a Scale To Fit menu to the top of the View menu..
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Value
menuScale &Scale to Fit
Add the menuImage_ChildClick method as the Click event handler for the menuScale menu item.
The handler is registered with the Click event associated with the menu.
The code generated by these steps is similar to the menu code generated in chapter 3 and elsewhere. In particular, note that the Index property settings for these menus are adjusted in the InitializeComponent method to reflect the insertion of the new item at the first location.
menuScale.Index = 0; menuStretch.Index = 1; menuActual.Index = 2;
Since the DisplayMode enumeration must match our menu, we need to update the values appropriately.
UPDATE DISPLAYMODE ENUMERATION Action 9 10 Locate the DisplayMode definition in the MainForm.cs source file. Add a ScaleToFit value and adjust the settings to match the Image submenu. Set the default value for the _selectedMode field to the new setting. Result
private enum DisplayMode { ScaleToFit = 0, StretchToFit = 1, ActualSize = 2 } private DisplayMode _selectedMode = DisplayMode.ScaleToFit;
We also need to check each place in the code where this enumerator is used. If you do a search, you will discover the _selectedMode field in menuImage_Popup, menuImage_ChildClick, and OnPaint. The popup event is not affected by this change, but the click handler requires a change to its switch block.
DRAWING AND SCROLLING
UPDATE MENUIMAGE_CHILDCLICK EVENT HANDLER Action 12 Locate the
menuImage_ChildClick method in
Result
protected void menuImage_ChildClick (object sender, System.EventArgs e) { . . . switch (_selectedMode) { default: case DisplayMode.ScaleToFit: // Scale image to fit display area this.Invalidate(); break; case DisplayMode.StretchToFit: . . . } . . . }
the MainForm.cs source file. 13 Add the new display mode to the switch statement, and make it the default.
The final change required to properly scale our image is in the OnPaint method. Here we simply draw the image into the Rectangle determined by our Photograph.ScaleToFit method.
UPDATE ONPAINT METHOD Action 14 Locate the OnPaint method in the MainForm.cs source file. Add the new display mode to the switch statement, and make it the default. Result
protected override void OnPaint(PaintEventArgs e) { . . . switch (_selectedMode) { default: case DisplayMode.ScaleToFit: // Preserve aspect ratio of image g.DrawImage(photo.Image, photo.ScaleToFit(DisplayRectangle)); break; case DisplayMode.StretchToFit: . . . } . . . }
There you have it. The Scale to Fit display mode is very similar to the Stretch to Fit display mode. Both fit the image into the display area, and both draw the image into a rectangle. The difference is the rectangle into which they draw. Compile your application to verify that the image scales properly. It may be a bit hard to determine if this is working properly since a window resize does not cause the image to be redrawn. Let s address this problem next.
IMAGE DRAWING
REPAINTING WHEN THE FORM IS RESIZED Now that we are drawing directly on the form, we need to redraw our image whenever the form is resized. The PictureBox control used in prior chapters handled this issue automatically for us. There is in fact a Resize event associated with controls. This event occurs when a control, including a Form object, is resized. Handling this event would allow us to invalidate the window whenever the display mode is ScaleToFit or StretchToFit. Since our MainForm class is derived from Form, we could even go directly to the protected OnResize method that raises this event. This would force our OnPaint method to be called and the window would update appropriately. A fine idea, but there is another way.
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