Java oval shape
In the previous chapter, we have seen the basic application of JavaFX, where we learnt how to create an empty window and how to draw a line on an XY plane of JavaFX. In addition to the line, we can also draw several other 2D shapes. In general, a 2D shape is a geometrical figure that can be drawn on the XY plane, these include Line, Rectangle, Circle, etc.
Each of the above mentioned 2D shape is represented by a class and all these classes belongs to the package javafx. After instantiating the class, you need to set the properties for the shape using the setter methods.
For example, to draw a line you need to pass its x and y coordinates of the start point and end point of the line. Finally, you need to add the object of the shape to the group by passing it as a parameter of the constructor as shown below. A line is a geometrical structure joining two point. The Line class of the package javafx.
In general, a rectangle is a four-sided polygon that has two pairs of parallel and concurrent sides with all interior angles as right angles.
This class belongs to the package javafx.Java Polymorphism Example using Shapes Classes
In JavaFX, you can draw a rectangle either with sharp edges or with arched edges and The one with arched edges is known as a rounded rectangle.
A circle is a line forming a closed loop, every point on which is a fixed distance from a centre point. In JavaFX, a circle is represented by a class named Circle. An ellipse is defined by two points, each called a focus. If any point on the ellipse is taken, the sum of the distances to the focus points is constant. The size of the ellipse is determined by the sum of these two distances.
In JavaFX, an ellipse is represented by a class named Ellipse. A closed shape formed by a number of coplanar line segments connected end to end. In JavaFX, a polygon is represented by a class named Polygon.
A polyline is same a polygon except that a polyline is not closed in the end.
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Or, continuous line composed of one or more line segments. A cubic curve is a Bezier parametric curve in the XY plane is a curve of degree 3. A quadratic curve is a Bezier parametric curve in the XY plane is a curve of degree 2. An arc is part of a curve. In JavaFX, an arc is represented by a class named Arc. Such shapes are represented by the class named SVGPath. This class has a property named content of String datatype.
This represents the SVG Path encoded string, from which the image should be drawn. In the previous section, we have seen how to draw some simple predefined shapes by instantiating classes and setting respective parameters. But, just these predefined shapes are not sufficient to build complexer shapes other than the primitives provided by the javafx. For example, if you want to draw a graphical element as shown in the following diagram, you cannot rely on those simple shapes. To draw such complex structures JavaFX provides a class named Path.
Note : Answer has been updated to cover the scenario where background is an instance of ColorDrawable. Thanks Tyler Pfafffor pointing this out. However, you should use mutate on the drawables before modifying them if they are used elsewhere. By default, drawables loaded from XML share the same state. A simpler solution nowadays would be to use your shape as a background and then programmatically change its color via.
I've updated the answer to use PorterDuff. Here's the official documentation with more details on the different PorterDuff. Mode options that you have. Expanding on Vikram's answer, if you are coloring dynamic views, like recycler view items, etc Then you probably want to call mutate before you set the color. If you don't do this, any views that have a common drawable i. This question was answered a while back, but it can modernized by rewriting as a kotlin extension function.
My Kotlin extension function version based on answers above with Compat :. Learn more. Set android shape color programmatically Ask Question.
Asked 6 years, 8 months ago. Active 2 months ago. Viewed k times. I am editing to make the question simpler, hoping that helps towards an accurate answer.
Sky Kelsey Cote Mounyo Cote Mounyo What do you set this drawable to?
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The drawable is an oval and is the background of an ImageView. If this question as asked is too difficult, is there a way to draw multiple images onto a canvas and set the layered end product as the background of a view? You can achieve this by extending the View class, and using it as the base view in a layout that allows overlapping of widgets RelativeLayoutFrameLayout.
With the event handler class clickHandler I want to draw an oval on the button that I click the parameter of a clickHandler object. My following code hasn't worked though I don't know how to get rid of the null-value of variable g I'd appreciate any piece of advice.
Thank You a lot. In a class that creates the GUI - the game board full of buttons - I assign each button a new Action Listener - an instance of clickHandler this way:. About the Graphics object: it's best to keep it in it's paintComponent method, and to use it only there. It will always get passed in on a repaint, and if you save it for other moments, strange things can happen happy experimenting :.
Learn more. Drawing an oval on JButton when clicked Ask Question. Asked 7 years, 10 months ago. Active 7 years, 8 months ago. Viewed 6k times. BLUE ; this. Kit Kit 11 1 1 silver badge 3 3 bronze badges. I very much doubt a that the school project requires oval shaped buttons. Active Oldest Votes. Make your circle code there. A small Example : import java. BLUE ; g. Hidde Hidde 8, 7 7 gold badges 37 37 silver badges 62 62 bronze badges. Hey, Hidde, thanks, I'm not familiar with flags yet but I'll try to get the first two steps done.
A flag is just a variable you make in the extended JBitton class. You set that value on true or 1 or whatever you wantso that the paintComponent method knows that it has been clicked and needs a circle. Hidde : Pardon me, for my edit. Just couldn't stop myself from doing the hardwork of providing the SSCCE, for testing purpose :- If you think it shouldn't have to be there, please feel free to revert back and cancel my edits.
Added a point, regarding overriding getPreferredSize method, just like we override our paintComponent That's great, no worries :! This was a quick answer, I'm sure I have some code like this lying around somewhere, but you've just done it for me, thanks! Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password.Graphics; import java. Graphics2D; import java. Point; import java. MouseAdapter; import java. MouseEvent; import java.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Sure you can do that using Swing.
You may want to look into Java's Shape library for that. Check out Custom Painting Approaches for a couple of ideas. The DrawOnComponent is closer to what you want. It would need to be changed to add your custom shape objects to the list. GraphPanel is a simple example of an object drawing program that features moveable, resizable, colored nodes connected by edges. Java 2D is what you neede drawing graphics i. Learn more. How do I draw various shapes in Java? Which library should I use?
Asked 9 years, 3 months ago. Active 5 years ago. Viewed 63k times. I want to write a program which can draw any type of shape that I assign to it like Circle Square Rectangle Which library should I useand how do I go about it in Java? I am a python coderthus finding it difficult to cope with Java. Hick Hick Active Oldest Votes. Alternatively you can simply override the Component's paint method as shown below. I just want a box in which I will click mark on a particular type of image from a check boxand the image will appear.
If I click resetit will disappear and give me a black screen. If this is as simple as you've told, then overriding the paint method is more than enough. Its very straight forward. You will have to add a listener to the checkbox and write the logic in paint method to handle the condition on what to do when.
Custom painting is done by overriding the paintComponent method of a Swing component like JPanel. Also you should always invoke super. Read the section from the Swing tutorial on Custom Painting download.
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The Overflow Blog. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Technical site integration observational experiment live on Stack Overflow.In this part of the Java 2D tutorial, we create some basic and more advanced shapes. We fill shapes with solid colours, gradients, and textures.
In this example, we draw six basic shapes on the panel: a square, a rectangle, a rounded rectangle, an ellipse, an arc, and a circle. The fillRect method is used to draw both a rectangle and a square. The first two parameters are x, y coordinates of a shape to be drawn. The last two parameters are the width and the height of the shape. Here we create a rounded rectangle. The last two parameters are the horizontal and vertical diameters of the arc at the four corners.
The fillArc method fills a circular or elliptical arc covering the specified rectangle. An arc is a portion of the circumference of a circle. More complex shapes can be constructed with GeneralPath. Another way to create complex shapes is to compose areas.
Area stores and manipulates a resolution-independent description of an enclosed area of 2-dimensional space. It can be manipulated by addition, subtraction, intersection, and exclusiveOr operations. The Color class is used to work with colours in Java 2D. To fill rectangles with the current colour, we use the fillRect method. There is no need to create a copy of the Graphics2D class or to reset the value when we change the colour property of the graphics context. A new colour is created with the Color class.
The parameters of the constructor are the red, green, and blue parts of the new colour. The setColor method sets the graphics context's current colour to the specified colour value. All subsequent graphics operations use this colour value.
In computer graphics, gradient is a smooth blending of shades from light to dark or from one colour to another. In 2D drawing programs and paint programs, gradients are used to create colorful backgrounds and special effects as well as to simulate lights and shadows.
To work with gradients, we use the GradientPaint class.
By manipulating the colour values and the starting and ending points, we can get different results. A texture is a bitmap image applied to a shape. To work with textures in Java 2D, we use the TexturePaint class.
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To learn more about OOP, nhgrif challenged me to implement a Shape abstract class more details in code remarks below. Here is how I did it. Any and all advice appreciated!
I have a comment about the basic premise. The Shape should not be an abstract class, but an interface. It has no concrete implementations for any methods, and making it an abstract class makes it hard to inherit from other places too. Consider this instead:. The pi field on your Circle class should be private. There's no need to re-expose an already public constant in another way. I would avoid the 'unit' default constructors.
They don't help with anything. When would someone want to call new Triangle and not want to have the dimensions? Your classes are missing a toString method. These are useful for many reasons, especially debugging. You don't have a plan for out-of-bound dimensions. What will you do with negative, NaN, or infinite input? A nitpick on names: The dimensions of a rectangle should be width and height not width and length.
The constructor of Triangle should take descriptive parameter names, such as side1Length. You have more excuse to use a and b for private fields especially in this short, pure math codebut single-character names are generally frowned upon.
For extra credit, replace your main method with 3 unit tests 1 test class with 3 methods that can be easily run from the IDE. Though, there's no need for you to take up namespace or memory when you can directly use Math. For instance, your double area method's implementation could be:. I like that you use the abstract class to declare in your tests, doing that will afford you some flexibility in the future, just make sure you understand that when you rely on specific methods that only exist in a subclass you'd have to declare with that subclass.
In the comment you refer to the perimeter of the triangle, but in your code you don't use the actual perimeter. This is very small code duplication. Your code would be a bit more self-documenting if you would do:.