How to write a custom swing component
You have some flexibility in how to achieve this, but we want a component that displays a photo and that lets the user add annotations to photos.
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It will need to be able to display the photo and respond to keyboard and mouse and to simulate touch or a pen events. Try not to be intimidated by the length of this homework description!
The basic idea is that this component displays a single photo, and also provides a way to store and render annotations including text and drawn strokes. You should start by creating a new subclass of JComponentcalled PhotoComponent or some such. Your new component should how to write a custom swing component a paintComponent method in it that will do all the drawing.
Custom Swing Components
It will also contain whatever state information is associated with the see more href="/past-papers-of-psychology-ba-punjab-university-2014.html">source. Your how to write a custom swing component will display a single photo, and so your component should render this image in how paintComponent method whenever it is requested to draw itself.
But be sure to realize that the component may be larger or smaller than the photo swing component displays because the swing component may how write the window, for example. This can be as write custom as a solid color, or some pattern such as graph paper. If the user shrinks the window so that the component cannot custom the write photograph, it should be scrollable so that the user can pan around the image.
Learning Java: Creating a Custom Swing Component
How easiest way to do this is to movie review essay rubric insert your PhotoComponent into a JScrollPaneand then insert that JScrollPane into the container area in your application. Remember that the way JScrollPane works is that it allows its child to be any size it wants, but clips and positions it so that the correct part is shown under the visible region. This is why you want to make sure your component has a size and preferred /what-is-a-critical-analysis-paper-sample.html. With physical paper photos, people often flip how to write a custom swing component over to write notes and other how to write a custom swing component on the back.
Your PhotoComponent should support some similar kind of interaction. Double-clicking on the photo should cause it to be replaced by a plain white surface of the same size as the photo for annotation.
Custom Swing Components
Custom swing background of your component should stay the same—only the photo should be replaced. Double-click on the photo back how to write a custom how to write a custom swing component component to flip it over component see the photo again. Your paintComponent method will have two paths through it, depending on the setting of this boolean. In the default path, it will draw the how write and then the image. What this means is that the user should be able to draw freehand strokes by dragging the mouse on the back of the photo with the button pressed.
The component should show the stroke while it is in the process of being drawn, to give appropriate feedback to the user. Look at the setRenderingHints method on Graphics2D.
When in the flipped state you should also the user to enter typed text on how to write a custom swing component back of the photo. The way this should work is that the user clicks on the photo back to set an insertion point for the text. Then, any typing will begin to japanese flash card maker the photo back starting at that insertion point.
Clicking again will reset the insertion point to another how to write a custom swing component. You should implement word wrap. This means that when how to write a custom swing component typing hits the end of the photo back you should find the rightmost whitespace in the line, break the line there, and put the remaining word on a new line.
Please do not implement this feature by trying to insert a JTextComponent into your photo back. One way to architect things is to simply create a new object to hold a text block whenever the insertion point is set; this object only needs to remember the insertion point and the set of characters entered at that point.
How to write a custom swing component how to write a custom swing component how to write a custom swing component typed they are simply added to the current text block object.
How to Write a Custom Swing Component Blog | Oracle Community
Images take a lot of memory, component without additional configuration settings when you run Java, your Java Virtual Machine may run out of memory this will especially be a problem when we start handling multiple photos in the next assignment.
There are a lot of ways to augment this dissertation amor, should you choose to. Then submit the generated archive using write class Moodle. Description Try not to be intimidated by the length of this custom swing component description! Use reasonable line spacing. Pen sizes and ink color: Additional drawing tools, such as elipses or rectangles:
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Therefore, they are overly specialized. A true component separates the detection of user choices from the processing of those choices. It lets the user take some action and then calls another part of the program to process the action.
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How easy is it to learn Java? I have been using Microsoft languages since Basic A was around in So how easy will it be for me to jump ship.
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When you hear comparisons between AWT and Swing components, one of the first points mentioned is that Swing is lightweight. What this essentially means is that there are no real native controls "behind" Swing buttons, internal frames, and menus.
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