You can find this code in the file javafxshapes/Rectanglesfx in Java

Drawing Quick Response Code in Java You can find this code in the file javafxshapes/Rectanglesfx
You can find this code in the file javafxshapes/Rectanglesfx
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stroke: ColorBLACK fill: ColorYELLOW } ] } }
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The rounded corners are actually quadrants of an ellipse whose dimensions are controlled by the arcWidth and arcHeight variablesThe relationship of the ellipse to rectangle s corners is illustrated in Figure 16-3, which shows the special case in which the ellipse is actually a circle
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arcHeight
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arcWidth
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Figure 16-3
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The arcWidth and arcHeight variables of the Rectangle class
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Note that you actually specify the horizontal and vertical diameters of the ellipse, not its radiiThis contrasts to the Ellipse class, which you ll see shortly, where you specify the radiuses Circles is a simple class that draws a circle with a given radius around a specified center point, using the variables listed in Table 16-3
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Circle
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Table 16-3 Variable
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centerX centery radius
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Variables of the Circle Class Type
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Number Number Number
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Access Default
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RW RW RW
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00 00 00
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Description
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The x coordinate of the center of the circle The y coordinate of the center of the circle The radius of the circle
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Shapes
You have already seen several examples of the use of this class, including Listing 14-4 and Figure 14-3 in 14 Ellipses The Ellipse class draws an ellipse with its major and minor axes parallel to the coordinate axes, as specified by the variables listed in Table 16-4You can apply a rotation transformation to create a rectangle with its axes at any required angle to those of the coordinate system
Table 16-4 Variable
centerX centerY radiusX radiusY
Variables of the Ellipse Class Type
Number Number Number Number
Access Default Description
RW RW RW RW
00 00 00 00
The x coordinate of the center of the ellipse The y coordinate of the center of the ellipse The horizontal radius of the ellipse The vertical radius of the ellipse
The code in Listing 16-3, which you will find in the file an ellipse with a horizontal major axisThe result of running this code is shown in Figure 16-4
javafxshapes/AnEllipsefx, draws
(centerX, centerY)
radiusY
radiusX
Figure 16-4 Listing 16-3 Drawing an Ellipse
The variables that define an ellipse
package javafxshapes; import javafxscenepaintColor;
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import javafxsceneScene; import javafxsceneshapeEllipse; import javafxstageStage;
Stage { title: "An Ellipse" scene: Scene { width: 200 height: 200 content: [ Ellipse { centerX: 100, centerY: 100 radiusX: 80, radiusY: 60 stroke: ColorBLACK fill: ColorYELLOW } ] } }
Polygons and Polylines Both polygons and polylines are constructed by drawing straight lines linking pairs of an ordered set of points, defined by the points variable, as described in Table 16-5 If the first and last point are not the same, a shape drawn using the Polygon class will be automatically closed by a line segment drawn between the first and last points, whereas a Polyline shape will remain open
Table 16-5 Variable
points
Variables of the Polygon and Polyline classes Type
Number[]
Access
Default
Empty
Description
Sequence of number pairs that represent the coordinates of the line ending points
The code in Listing 16-4, from the file javafxshapes/APolygonfx, creates a hexagon by specifying the locations of its vertices, giving the result shown in Figure 16-5
Listing 16-4 Drawing a Polygon
package javafxshapes; import javafxstageStage;
Shapes
import javafxsceneScene; import javafxsceneshapePolygon; import javafxscenepaintColor; Stage { title: "A Polygon" scene: Scene { width: 200 height: 200 content: [ Polygon { points: [ 100,10, 180,60, 180,130, 100,180, 20,130, 20,60] fill: ColorTRANSPARENT stroke: ColorBLACK } ] } }
Figure 16-5
A hexagon created using the Polygon class
The values in the points sequence are alternately the x and y coordinates of the vertices of the hexagonThey have been grouped together in Listing 16-4 so as to make it clear where each coordinate pair begins and ends It is an error, and nothing is drawn, if this sequence has an odd number of elements The Polygon and Polyline classes have the same application programming interface (API), so to create a Polyline with the same vertices as the Polygon shown in Listing 16-4, it is only necessary to change the classname:
Polyline { points: [ 100,10, 180,60, 180,130, 100,180, 20,130, 20,60] fill: ColorTRANSPARENT stroke: ColorBLACK }
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This code, which you will find in the file javafxshapes/APolylinefx, produces the shape shown in Figure 16-6As you can see, the Polyline class does not close the shape by joining its first and last points By default, all shapes are filled with solid black, which is not likely to be what you want when using the Polyline classTo draw only the outline, set the stroke to the required outline color and fill either to null or ColorTRANSPARENT
Figure 16-6