Javafx canvas size

Can someone explain to me how I can avoid the performance decline of drawing on a Canvas, as it's size gets bigger? What's the reason for this?

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The same stroke on a Canvas is executed more and more slowly, as the size of the Canvas increases. It also seems that, despite "dirty-area" rendering techniques used by JavaFX, rendering of the scene becomes slower as the size of Nodes increases ex. This is remedied, when setCache true is applied. Which seems to be implied, as the documentation advises NOT to Cache, if the Node changes frequently.

Anyway, back to the question: Why is drawing on a Canvas becoming slower with size, although the same stroke, covering the same amount of areais executed? Apologies if I sound confusing or repeated myself, I am extremely tired. Thank You in advance, and good night. Create an sscce which reproduces the issue and log it against the Graphics component of the Runtime project in the JavaFX issue trackerthen link a reference to the ticket here. Include full environment details in your report - OS, Java version, video card make, model and version, resolutions used, hardware details, etc.

The following is simply a StackPane with a Canvas of size X This extreme size is just for emphasis purposes, as I don't know how powerful Your machine is.

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For art, most artists wouldn't go above Xwhere latency is already getting pretty ugly for my machine, with this issue. You will notice, that as You decrease the Canvas size in the code, drawing will become more and more smooth.

After some testing, it seems like the whole Canvas is redrawn, for every small modification done in some area on it. Even when the bulk of it is off-screen. That would imply that: a. Not just the area the stroke occurred in is redrawn, but the whole Canvas.

Not just the portion of the Canvas visible on the screen is redrawn, but the whole Canvas. Depth of my Knowledge: I am not a professional in Computer Graphics Programming, so those are my humble guesses. I am not trying to waste anyone's time or to troll anyone. A simple guide in the right direction would also be appreciated. Application; import javafx. EventHandler; import javafx.

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EventType; import javafx. Scene; import javafx. Canvas; import javafx. GraphicsContext; import javafx. MouseEvent; import javafx. StackPane; import javafx.I've been maintaining FX Experience for a really long time now, and I love hearing from people who enjoy my weekly links roundup.

Therefore, FX Experience will become read-only for new blog posts, but weekly posts will continue to be published on JonathanGiles. This is not the end - just a consolidation of my online presence to make my life a little easier!

I was hacking on a application today and wanted a dot grid in the background. Canvas by default has a fixed size so I wrapped it in a Pane to make it Resizable. Also if you ever need a grid, it could be applied to a normal line grid just as easily. So here is a little test app with a single node of my DotGrid. There really is not much too it, when the layout is applied to Pane check if size has changed and redraw the canvas.

In this case I have not set any preferred size for the DotGrid so it will be whatever size its parent wants it to be. If you need it to be a minimum size you could call setPrefSize or setMinSize in the constructor.

Just looked at your method, it has the advantage of being a single node but there is one issue with it. When it is resized it will draw twice at a minimum, when width and height are set. If you trigger draw off layout you will get at most one draw per frame. You could just override the layout method in your Canvas subclass.

javafx canvas size

You may need to call requestLayout from the width and height listeners. This solution are also usefull when your Canvas placed deep inside your scene graph, or in other words — Canvas have long chain of parent Nodes. This is more actual when you develop editor with the many standard controls and Canvas at center area of your app.

The problem with this grid is that once you resize the canvas the previous data of canvas i. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. Gluon offers industry-leading solutions for mobile and cloudas well as professional Java and JavaFX consultancy. FX Experience is maintained by Jonathan Giles. Test Application import javafx. Application; import javafx. Scene; import javafx.

Color; import javafx.JavaFX allows you to scale, translate, and rotate lines and shapes. Here are several methods of the Node class that are especially useful when working with shapes:. The setTranslateX and setTranslateY methods moves the 0, 0 point from the top-left corner to any arbitrary point. The setScaleX and setScaleY methods let you change the scale of a shape so that it appears smaller or larger. These methods can be used for any node in the scene graph, and any transformations you apply to one node are inherited by any children of that node.

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If you apply a transformation to the root node of a scene, the transformation effectively applies to the entire scene. For example, this figure shows the ShapeMaker program after its root node has been rotated and translated.

javafx canvas size

The only difference is the addition of the following three lines:. The first line rotates the root node 30 degrees. Then, the next two lines translate the root node pixels in both the x- and the y-axis. Scaling changes the relative size of the x- or the y-axis, which allows you to zoom in or out on a single shape or, if you scale the root node, the entire scene.

Doug Lowe has been writing computer programming books since the guys who invented Java were in high school. Lowe has written books on a wide variety of topics and is the bestselling author of more than 30 For Dummies books, including all editions of Java All-In-One For D ummies. About the Book Author Doug Lowe has been writing computer programming books since the guys who invented Java were in high school.Jakob Jenkov Last update: The JavaFX HBox component is a layout component which positions all its child nodes components in a horizontal row.

The Java HBox component is represented by the class javafx. HBox also has a constructor which takes a variable length list of components it should layout. Here is an example of how to do that:.

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This HBox example will layout the two Button instances next to each other in a horizontal row. For an HBox to be visible it must be added to the scene graph. This means adding it to a Scene object, or as child of a layout which is attached to a Scene object. Notice that the two Button controls are kept on the same horizontal row even if there is not enough space to show them in their fully preferred widths.

The buttons do not "wrap" down on the next line. In the earlier example the HBox positioned the nodes button controls right next to each other. You can make the HBox insert some space between its nested controls by providing the space in the HBox constructor. Here is an example of setting the space between nested controls in an HBox :. This example sets the spacing between the controls in the HBox layout component to You can also set the space between the nested controls using the setSpacing meethod, like this:.

You do so via the HBox setAlignment method. This example will make the HBox position its child nodes along the baseline vertically of the vertical line, and from the center of the line and out horizontally. You can specify whether a child node of an HBox should grow horizontally to fill any available space available inside the HBox.

You do so via the HBox setHgrow static method. You have to specify which child node the rule is set for. You do so by passing the child node as parameter to setHgrow. You also have to pass the horizontal expansion policy as parameter to setHgrow. Here is an example of telling that a child Button to expand horizontally if space is available inside the HBox:. The Priority class contains the following constants you can use to set the expansion policy:.

Please keep in mind that the HBox will only have extra horizontal space available if the HBox is wider than the sum of the preferred widths of its children. The default preferred height of an HBox is set to the same value as the largest preferred height of any of its child nodes. The JavaFX HBox fillHeight property can be used to tell the HBox control whether it should expand the height of its children to fill out the whole height of the HBox, or keep its children at their preferred heights.

The fillHeight property only affects child components which heights can actually change. For instance, a Button does not change its height by default. It's max height is set to its preferred height. However, you can override that by setting the max height of the Button, or any other component you want to nest inside the HBox, to a value different than its preferred value.

Application; import javafx. Scene; import javafx. Button; import javafx. HBox; import javafx.

javafx canvas size

Child Node Spacing In the earlier example the HBox positioned the nodes button controls right next to each other. You can also set the space between the nested controls using the setSpacing meethod, like this: hbox.

HBox Preferred Height The default preferred height of an HBox is set to the same value as the largest preferred height of any of its child nodes.You can create lines, rectangles, circles, and arcs in JavaFX.

You can easily modify the sizes, corners, and other attributes of shapes. Here are code listings and examples for each. The most basic type of shape is a line, created with the Line class. To create a line, you specify the x and y coordinates of the start and end of the line, as in this example:.

This code creates a line that goes from 0,0 to The grid lines in this figure were drawn by line shapes inside a for loop, like this:. The for loop iterates a variable i from 0 to in increments of On each iteration of the loop, two lines are created: a vertical line that uses the variable i as its x-axis and a horizontal line that uses the variable i as its y-axis.

javafx canvas size

The stroke color for each line is set to light gray, and the lines are then added to a Group object named group1. A rectangle requires an x, y starting point, a width, and a height. Here the rectangle starts at 50, Its width isand its height is Notice that the fill color is set to null so that the rectangle will be transparent.

You can create a rectangle with rounded corners by calling the setArcWidth and setArcheight methods. Here, the corners are rounded with an arc whose height and width are both For the third shape in the first row of the figure, arc width is set to 75 and the height to To create a circle, you use the Circle class, specifying the x- and y-coordinates of the center of the circle and the radius.

An ellipse is similar to a circle, but has two radii: one in the x-axis, the other in the y-axis. You specify both radii in the constructor. Another useful type of shape is an arc, which is a segment of an ellipse. To create an arc, you supply the parameters for the ellipse and then you supply the angle at which the arc begins: 0 is due east on a clock face.

Finally, you supply the length, which represents how much of the ellipse the arc spans and is also expressed in degrees. The important thing to know is that the arc travels counterclockwise from the starting point. JavaFX can create three types of arcs, which you can specify via the setType method:. CHORD: Means that you want to draw the arc and then connect the ends with a straight line to create a closed shape.

ROUND: Means that you want to use straight lines to connect the ends to the center of the ellipse, thereby creating a shape that looks like a piece of pie.

Doug Lowe has been writing computer programming books since the guys who invented Java were in high school. Lowe has written books on a wide variety of topics and is the bestselling author of more than 30 For Dummies books, including all editions of Java All-In-One For D ummies.

About the Book Author Doug Lowe has been writing computer programming books since the guys who invented Java were in high school.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

I am new to JavaFX and I encountered a problem resizing a canvas. I am trying to get the canvas size to fit exactly the contents I place into it. I tried resizing the canvas using setWidth and even setting the canvas on small size from the begining but nothing seems to help.

JavaFX Tutorial part2 How to set the size of program

We need to clarify on what you really want. If I understand correctly now what you want is that the window size itself isn't larger than the Canvas size. As jewelsea pointed out in the comments you can change the Canvas width and height.

In fact you are doing it already in your code. You clearly see that the Canvas has been resized. The problem you are facing is that the window can't be smaller. That's the white or here yellow space from the Scene, not from the Canvas. You could try setting the width to 1 and height to 1, but you'll still end up with this:. You could change the style using the initStyle method to get rid of the buttons.

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Canvas is an image that can be drawn on using a set of graphics commands provided by a GraphicsContext. A Canvas node is constructed with a width and height that specifies the size of the image into which the canvas drawing commands are rendered. All drawing operations are clipped to the bounds of that image. Your solution would be either to copy the canvas area to a new canvas with another size or don't use a canvas at all, instead use e.

But that all depends on your requirements. Learn more.Scott has been documenting JavaFX since its inception in Prior to that, he has contributed extensively to both the Java Tutorial and Java platform documentation.

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Send us feedback about this document. If you have questions about JavaFX, please go to the forum. Using this API involves creating a Canvas object, obtaining its GraphicsContextand invoking drawing operations to render your custom shapes on screen.

Lines, ovals, round rectangles, arcs, and polygons are all possible using methods of the GraphicsContext class.

As shown in Example 1the Canvas is instantiated with a width of and a height of Its GraphicsContext is then obtained with a call to canvas. After that, a number of basic drawing operations are carried out by invoking methods such as strokeLinefillOvalstrokeArcand fillPolygon.

The next example CanvasTest project tests more of the GraphicsContext methods by drawing a custom shape, along with some gradients and shadows. The final result appears as shown in Figure 2. The code for this example is organized so that each drawing operation is carried out in its own private method. This allows you to test out different features by simply invoking or commenting out the methods of interest.

Just keep in mind that in terms of learning the Canvas API, the code to focus on is the underlying calls to the Canvas or GraphicsContext objects. First, the position of the Canvas is set at coordinates 0,0. This is done by invoking the code in Example 2which applies a translation transformation to the underlying Canvas object.

You can pass in other values as parameters to move the Canvas to a new location.

JavaFX | Canvas Class

The values that you pass in will be forwarded to the setTranslateX and setTranslateY methods, and the Canvas will move accordingly.

Next, the primary shape which looks like the capital letter "D" is drawn on screen. This is done with a bezier curve, invoked through the bezierCurveTo method of the GraphicsContecxt object. You can experiment with this shape by changing the parameter values. The bezierCurveTo will stretch and pull the shape as you do.

After that, a red and yellow RadialGradient provides the circular pattern that appears in the background. Again, you can experiment with different values, or pass in different colors as you prefer. This code sets the stroke of the GraphicsContext to use the LinearGradientthen renders the pattern with gc.

And finally, the multi-colored drop shadow is provided invoking applyEffect on the GraphicContext object. As shown in Example 6this effect is applied by creating a DropShadow object with a specified color, which gets passed to the applyEffect method of the GraphicsContext object. In the following demo project CanvasDoodleTest a blue square appears on screen, which will slowly be erased as the user drags the mouse across its surface.