Variable in Java

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Table 16-9 Variable
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Elements fillRule
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Variables of the Path Class Type
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PathElement[] FillRule
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FillRule NON_ZERO
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The PathElements that make up the path Determines how the shape is filled
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The fillRule variable is used to determine whether a given point is to be regarded as inside or outside the shape when applying the fill color, if there is one In some cases, it is not obvious what should be properly regarded as the inside or outside of the shape For more details, see the Shape Filling section, later in this chapter There are eight different types of path element that can be combined to create a shape The PathElement class itself has only one public variable, as shown in Table 16-10
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Table 16-10 Variable
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Variables of the PathElement Class Type
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Description
Specifies whether coordinates in this element are absolute (true) or relative (false)
No matter how many elements it has, a path is only a single node and therefore has a single stroke and a single fill It is not possible to separately color individual elements MoveTo, Lines, and ClosePath The first element of a path must always be a MoveToThis class has only two public variables, x and y, both of type Number that set the starting point for the next element in the path There are three path elements that draw straight-line segments: LineTo, HLineTo, and VLineToThe most general of these is LineTo, which joins its implicit starting point to the point given by its x and y variablesThe HLineTo class draws a horizontal line from its starting point to a point with a given x coordinate, while the VLineTo class draws a vertical line to a given y coordinate Paths are not automatically closedYou can close a path by explicitly drawing a straight line from the ending point of the last element to the starting point of the first, but a more convenient way to do this is to use the ClosePath element, which uses the Path s memory of its first and most recent points to draw the line required to close the path The code in Listing 16-7, which is from file javafxshapes/StraightLinePathsfx, uses the MoveTo, HLine, LineTo, and ClosePath elements to build a path that looks like a five-pointed star, as shown in Figure 16-11
4 3 6
Figure 16-11 Listing 16-7
1 2 3 4
Using straight line path elements
Using Straight Line Path Elements to Draw a Five-Pointed Star
package javafxshapes; import javafxscenepaintColor; import javafxsceneScene;
Shapes
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
import import import import import import
javafxsceneshapeClosePath; javafxsceneshapeHLineTo; javafxsceneshapeLineTo; javafxsceneshapeMoveTo; javafxsceneshapePath; javafxstageStage;
Stage { title: "Straight Lines" scene: Scene { width: 200 height: 200 content: Path { fill: null stroke: ColorBLACK elements: [ MoveTo { x: 10 y: 60 } HLineTo { x: 180 absolute: false } LineTo { x: -150 y: 110 absolute: false } LineTo { x: 60 y: -160 absolute: false } LineTo { x: 80 y: 160 absolute: false } ClosePath {} ] } } }
// // // // // //
1 2 3 4 5 6
The Path node that draws this shape is created on lines 17 to 28The first element is a that moves the logical pen that will draw the shape to (10, 60) relative to the scene, which is the point labeled (1) in Figure 16-11The HLine element on line 22 moves the pen 180 pixels to the right, as shown by the horizontal line labeled (2) in the figure Notice that the absolute variable for this element, and all the following elements in this path, is set to false so that we can use relative coordinates this makes it possible to move the whole shape just by changing the x and y variables in the MoveTo element The next three elements, of type LineTo, create the diagonal lines labeled (3), (4), and (5) The last diagonal line, number (6) in Figure 16-11, is drawn by the ClosePath element on line 26 of Listing 16-7The starting and ending points of ClosePath are implicit, so there is no need to specify the location of point (1) to close the shape