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Arcs The Arc shape draws a portion of the outline of an ellipseThe variables that control the arc are listed in Table 16-6
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Table 16-6 Variable
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centerX centerY radiusX radiusY startAngle length type
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Variables of the Arc Class Type
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Number Number Number Number Number Number ArcType
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Access
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RW RW RW RW RW RW RW
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Default
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00 00 00 00 00 00 ArcType OPEN
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Description
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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 starting angle of the arc, in degrees The length of the arc, in degrees The arc type
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The code in Listing 16-5 (which you will find in the file javafxshapes/Arcsfx) draws three arcs that use each of the different arc types, giving the result shown in Figure 16-7
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length radiusY
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radiusX
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startAngle
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Figure 16-7
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Three elliptic arcs
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Listing 16-5
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Drawing Arcs
package javafxshapes; import import import import import javafxstageStage; javafxsceneScene; javafxsceneshapeArc; javafxsceneshapeArcType; javafxscenepaintColor;
Stage { title: "Arcs" scene: Scene { width: 200 height: 300 content: [ Arc { centerX: 100 centerY: 60 radiusX: 80 radiusY: 50 startAngle: 30 length: 120 type: ArcTypeOPEN fill: ColorTRANSPARENT stroke: ColorBLACK } Arc { centerX: 100 centerY: 160 radiusX: 80 radiusY: 50 startAngle: 30 length: 120
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type: ArcTypeCHORD fill: ColorTRANSPARENT stroke: ColorBLACK } Arc { centerX: 100 centerY: 260 radiusX: 80 radiusY: 50 startAngle: 30 length: 120 type: ArcTypeROUND fill: ColorTRANSPARENT stroke: ColorBLACK } ] } }
The radiusX and radiusY values determine the horizontal and vertical radiuses of the ellipse of which the arc is part of the outline If these values are equal, the arc is circular The startAngle variable determines the position on the ellipse at which the arc begins As shown on the bottom curve in Figure 16-7, this angle is measured from the 3 o clock position and is measured counterclockwise if the value is positive, as it is in all three cases in Listing 16-5, and clockwise if it is negativeThe length variable is the number of degrees through which the arc turnsAgain, this is counterclockwise if the value is positive and clockwise if it is negative The type variable specifies how the arc should be closedAn arc with type ArcTypeOPEN, which is used for the top arc in Figure 16-7, is not closed at all, one with type ArcTypeCLOSED is closed by drawing a straight line between its starting and ending points, while one with type ArcTypeROUND is closed by linking the ending points of the arc to its center to make a pie shape, as shown at the bottom of Figure 16-7 Quadratic Curves The QuadCurve class draws a quadratic Bezier curve, which is basically a parabolic shape drawn between two points that may or not be symmetrical about a line drawn at right angles to the line connecting those points If this sounds a little obscure, all will become clear when you see some examples If you want to read a more mathematical description of what a Bezier curve is, see the Wikipedia article at http://enwikipediaorg/wiki/ Bezier_curves A quadratic curve is defined by its starting and ending points and a third point, known as the control point, whose position relative to the starting and ending points determines the overall shape of the curveThe variables of this class, which define the locations of these three points, are listed in Table 16-7 The easiest way to see the effect of the control point is to run the code shown in Listing 16-6, which draws the starting and ending points and the control points as small
Shapes
Table 16-7 Variable
startX startY endX endY controlX controlY
Variables of the QuadCurve Class Type
Number Number Number Number Number Number
Access
RW RW RW RW RW RW
Default
00 00 00 00 00 00
Description
The x coordinate of the starting point of the curve The y coordinate of the starting point of the curve The x coordinate of the ending point of the curve The y coordinate of the ending point of the curve The x coordinate of the control point The y coordinate of the control point
circles, together with the corresponding quadratic curve (see lines 55 to 64)3 This code uses a variant of the NodeDragger class that you saw in 15, Node Variables and Events, to enable you to drag all three points around the sceneAs you do so, the coordinates of the starting and ending points are printed, and the shape of the curve is updated to reflect their current positions
Listing 16-6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20