I'm totally new to foxpro...been playing with it over the weekend. I got an image control on my form, and I'm wondering how to zoom, pan, rotate, ect. Are these functions in the image control somewhere, & I'm just missing them...or is there a better image control out there I should be using?
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Images & Foxpro...
- Thread starter VVVA
- Start date
Mike Lewis
Programmer
Hi VVVA,
Welcome to Visual FoxPro, and to the forum.
The Image control is designed mainly just to display static images on a form. You can rotate the image by setting the control's RotateFlip property. You can also resize the control by changing its Height and Width. If the resized control is smaller than its contained image, the Stretch property says whether the image should be clipped or resized.
However, there is no way to pan or zoom an image using the Image control. If you want more than the basic features, you should use some alternative way of displaying images, such as an ActiveX control. The Kodak Imaging control might be one possibility.
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
Welcome to Visual FoxPro, and to the forum.
The Image control is designed mainly just to display static images on a form. You can rotate the image by setting the control's RotateFlip property. You can also resize the control by changing its Height and Width. If the resized control is smaller than its contained image, the Stretch property says whether the image should be clipped or resized.
However, there is no way to pan or zoom an image using the Image control. If you want more than the basic features, you should use some alternative way of displaying images, such as an ActiveX control. The Kodak Imaging control might be one possibility.
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
ChrisRChamberlain
Programmer
It's relatively simple to enable zooming in and out of an image control.Mike said:
You can use the .MouseWheel() event, cmdbuttons, the Microsoft Slider control, etc to effect this.
Set the .Stretch property of the Image control to 1, and proportionally increase or decrease the dimensions of the image control thus zooming in or out.
FAQ184-2483
Chris ![[pc2]](/data/assets/smilies/pc2.gif "[pc2] [pc2]")
PDFcommander.com
motrac.co.uk
ChrisRChamberlain
Programmer
VVVA
Another consideration - as the Image control only supports raster image types, you will need to control the maximum zoom level.
Depending on the actual image, this may be as low as 105/110% or as high as 115/120% of the original image size before the image visually degrades.
So the technique suggested will not be much use on say 16x16 pixel images, but will be effective on any image of a substantial size.
PDFcommander.com
motrac.co.uk
Another consideration - as the Image control only supports raster image types, you will need to control the maximum zoom level.
Depending on the actual image, this may be as low as 105/110% or as high as 115/120% of the original image size before the image visually degrades.
So the technique suggested will not be much use on say 16x16 pixel images, but will be effective on any image of a substantial size.
FAQ184-2483
Chris PDFcommander.com
motrac.co.uk
Mike Lewis
Programmer
Chris,
But that doesn't zoom the picture. It merely resizes it. If I understand this right, zooming means increasing or decreasing the size of an image within a given space. Or am I missing something?
Mike
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
But that doesn't zoom the picture. It merely resizes it. If I understand this right, zooming means increasing or decreasing the size of an image within a given space. Or am I missing something?
Mike
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
ChrisRChamberlain
Programmer
That's what exactly what the technique does.Mike said:
With respect, the question of whether or not it actually zooms the picture, becomes academic.
The given space can be a form or a container within a form - either way you're increasing or decreasing the size of an image within the form or container.
If you extend the technique you can develop apps that allow users to zoom, pan, rotate, crop and thus create new images, (saved by selective screen capture), from existing images using a simple combination of container and image control.
FAQ184-2483
Chris PDFcommander.com
motrac.co.uk
Mike Lewis
Programmer
Chris,
Fair comment. I was thinking that the desired behaviour would be to vary the size of the image within the boundaries of its container. But you're right that zooming also implies increasing or decreasing the container size.
Mike
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
Fair comment. I was thinking that the desired behaviour would be to vary the size of the image within the boundaries of its container. But you're right that zooming also implies increasing or decreasing the container size.
Mike
__________________________________
Mike Lewis (Edinburgh, Scotland)
My Visual FoxPro site: www.ml-consult.co.uk
Olaf Doschke
Programmer
You could also put the image control inside a container control, then increase the image control size, but clip it with the outer container. That also makes it possible to pan by positioning image.left and .top eg to negative values.
Bye, Olaf.
Bye, Olaf.
ChrisRChamberlain
Programmer
Olaf
I place a transparent shape over a container containing the image control on a form.
You can then use the right mouse to move/resize the container within the form or SHIFT + right mouse to move the image control within the container, the transparent shape 'passing on' the instructions to the underlying controls.
Once the user has resized the container to their liking, zoomed in or out of the image and/or moved the image control within the container, then selective screen capture will create a new resized cropped image derived from the original.
PDFcommander.com
motrac.co.uk
I place a transparent shape over a container containing the image control on a form.
You can then use the right mouse to move/resize the container within the form or SHIFT + right mouse to move the image control within the container, the transparent shape 'passing on' the instructions to the underlying controls.
Once the user has resized the container to their liking, zoomed in or out of the image and/or moved the image control within the container, then selective screen capture will create a new resized cropped image derived from the original.
FAQ184-2483
Chris PDFcommander.com
motrac.co.uk
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