I'm a bit of a Livecode newbie so I apologize if this is obvious. But I created a stack. Added fields, buttons, code etc. Then I drew and painted some images. Saved. When I reopened the stack, all my image work was gone! aqrrg. Happened twice. Why?
Make sure you add an image object before drawing. Adjust it to the size you need, then draw on the image object and it will be saved with your stack. If you fail to add an image object first, your drawing will disappear, not sure if this is a bug or not, but it isn't logical because you do see the drawing.
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I have been working on using Drag and Drop with JavaFX, and one thing I notice is that items are given lowered opacity compared to their actual images, as well as the larger the image the made "Faded/transparent" the image gets. I am working on am application that can drag fairly large items which end up almost invisible when dragging, which defeats the purpose of using a DragView Image in the first place, and makes this unusable for larger items (the way I'm using the DragView I want the images to be a certain size compared to the scene in which I'm dragging onto).
My application essentially has 2 Windows (Stages) where the data is in one Stage and I get the item from a list and drag it onto the scene. The DragView image is a representation of the object going onto the scene, so when I drop the DragView Image, it gets dropped exactly into place on the scene, so the DragView is important to my overall application.
Just a NOTE: There is also backing data in my transfer in order to recreate the box, as well as additional data that gets transferred with the Drag and Drop.
I tried looking at the FX DragView Internal code but didn't find anything that sets the Opacity or anything like that, so one of my assumptions of "it's built into the OS" is something I keep thinking about, as lowered opacity is something I remember being built in, and when trying it it does happen, but very very slight, and not as bad as what I'm experiencing (Also possible that since the icons are much smaller they don't run into the "larger image opacity issue."
I am running Windows 7 64-Bit for those who are wondering.
My question is, is it possible to change the opacity settings of the Drag and Drop ImageView either via JavaFX or possibly Native with using something along the lines of JNI?
I don't have any example code at the moment, but can add if someone is interested, but I'm sure for those who know about Drag and Drop ImageViews should already know about the opacity.
Thank you all.
First of all, keep in mind that I am a beginner in win32, so I am very likely to be missing the obvious.
I am working with Code::Blocks, C++, win32. I am making a program that:
would load an image from a file
would load some info from another file and draw it over the image.
The program would then draw additional stuff over the image later on. Also, I don't need this drawing to be actually incorporated into the image, the image only acts as a reference for the drawing.
I have managed to display the image in a child (static) window and I have successfully drawn the info onto the main window. When I wanted to combine the two so the drawing would go over the image, however, I got stuck - I didn't know what window to draw to and which message to process for the drawing. I have searched the Internet for any hints, examples, anything, but I found nothing. (This is probably because I didn't know exactly how to describe my problem.)
I have been trying different things over the past few days, like drawing to the static control with the image, and trying to paint to a transparent static control on top of the one for the image, but nothing worked.
If anyone could give me any hints, that would be great! Thanks!
Trap the WM_PAINT message for the window you want to draw. In the handler, add code draw the image (BitBlt function perhaps) first and then the drawing you want. You must also handle WM_ERASEBKGND message which is used to erase the background of the window when re-sizing etc.
Refer: WM_PAINT message, WM_ERASEBKGND message
I have built so far an application that allows the user to drag and drop images onto a NSImageView. However, I want to be able to move these images by simply clicking on any image and hold down the mouse button to move it's location.
How can I manipulate NSImageView to translate/scale after setting the images down? Is that possible? I've read about the NSAffineTransform, but it seems like that is moving the images before creating the image itself. I already have the images on the canvas, and simply want to click and hold the image and move it with my mouse. Please help anyone!
There are two sides to this.
NSImage is the model object, which you might want to display in different ways, save to disk/archive, etc. If you want to actually change the model (scaling, rotating, etc.), implying a permanent change, then you are going to probably want to look at NSAffineTransform, Quartz drawing, etc.
But you probably didn't mean that. Instead you probably are interested in NSImageView, which is a view object, displaying the contents of the NSImage model object using whatever display attributes are desired. If you only want to change how an image is displayed, not what the actual bytes in the image are, then you are going to manipulate the NSImageView at run-time. You can use NSAffineTransform here as well, but it's somewhat uncommon (and usually unnecessary).
The key thing to note that is the NSImageView inherits from NSView, so you have all its power at your disposal. Take a look at certain methods, such as:
-setFrameSize: - useful for changing the view size, and thus the image display scale
-setFrameOrigin: - useful for changing the view position, and thus the apparent image position
Note again that these have nothing to do with images per se, and apply to all Cocoa views. You may want to take a look at a book like Cocoa Programming for Mac OS X to get you past the basics. (You can then do more interesting things, like rotation, animation, etc.)
I have an NSMutableArray of jpg images and I want to be able to touch and, moving my finger from right to left, move through the array of images in order. I've been reading about UIScrollView, but I'm not sure if this accomplishes what I am looking for. It seems to me that UIScrollView is more used for viewing an object that is too large to be displayed entirely on the screen and you need to be able to move to see every part of the object. I need to move to an entirely new image, the next image in my array. What is the best way to go about this?
You certainly can use a UIScrollView for what you want. A scroll view can be used, as you noted, to scroll an area that is too large for the screen. However, you can also use it to scroll through "pages". This is really the best way to do what you want, short of rolling your won scroll view.
There is a property of UIScrollView, called pagingEnabled, which you'll want to set to YES. I suggest that you give it a try. Also, have a look at the UIScrollView documentation and the Scroll View programming guide. It will tell you all that you need to know about UIScrollViews. Also, remember that for proper memory management, you'll want to only load three images at any given time. See this answer that I wrote for more information on that, and on UIScrollViews in general.
I've been banging my head about this seemingly easy task and I could really use some help.
I have a wide Image loaded in the gui (using the designer..) and I want to be able to draw only a portion of it, a rectangle.
I need to be able to change this rectangle position over the large image, in order to draw a different part of the larger image at will. In this process the rect must maintain its size.
Using the Ui::MainWindow object I'm able to access the label holding the image and a solution that involves using this option is preferred (in order to keep up with the rest of the code I've already written )
Any solution will be much appreciated :)
Thanks,
Itamar
I would definitely (for ease of use) just place an empty label as placeholder in Designer.
Then implement the paintEvent for this label (delegate it to your own method). You'll have also have to look into QPainter, QPixMap, etc... Should be doable based on these hints and the documentation.
If you want more, I suggest you provide a small code snippet to work upon.
If you want to do this more or less purely through designer, you could put a QScrollArea where you want the portion of the image to appear. If you set the scroll area's scrollbar policy to be never shown, you can then manually change what part is visible via the scroll area widget. However, this would probably be more complex that creating a derived widget and reimplementing the paint function.