Program Explanation Invocation of “strokePolygon” to draw a rectangle: The invocation of “strokePolygon” to draw a rectangle is given below: //Initializes "double" array for "x" coordinates private double[] x_Coord_values = {7, 27, 27, 7}; //Initializes "double" array for "y" coordinates private double[] y_Coord_values = {8, 8, 18, 18}; ........... ........... //Define "start" method @Override public void start(Stage primStage) throws Exception { /* Invocation of "strokePolygon" method with three arguments such as values of x and y coordinates and number of points */ gc.strokePolygon(x_Coord_values, y_Coord_values, x_Coord_values.length); } Explanation: From the above code snippet, First define the values for “x” and “y” coordinates in “double” array. Then invocating the method “strokePolygon” with three arguments “x_Coord_values”, “y_Coord_values” and “x_Coord_values.length”. Here “x_Coord_values” represents the array values of “x”. “y_Coord_values” represents the array values of “x”. “x_Coord_values.length” defines the number of points. Reasons for containing values in variables “x_Coord_values” and “y_Coord_values”: From the given question, the upper left is at the point (7, 8) which is defined by (x, y). Explanation: From the above diagram, the upper left point is considered as “P1”. Other corners are represented as “P2”, “P3” and “P4”. For point P1(x1, y1) = (7, 8) For point P2(x2, y2) = (20+x1, y1) = (27, 8) For point P3(x3, y3) = (x2, 10+y2) = (27, 18) For point P2(x4, y4) = (x1, 10+y1) = (7, 18) Hence the points of rectangle are given below: Therefore, from the above four points, the values of x coordinates is {7, 27, 27, 7} and the values of y coordinates is {8, 8, 18, 18} . Complete code: The complete code for drawing a rectangle using “strokePolygon” method is given below: //Import required package import javafx.application.Application; import javafx.scene.canvas.Canvas; import javafx.scene.Scene; import javafx.scene.Group; import javafx.stage.Stage; import javafx.scene.canvas.GraphicsContext; import javafx.scene.paint...

Java: An Introduction to Problem Solving and Programming (8th Edition)

8th Edition

ISBN: 9780134462035

Author: Walter Savitch

Publisher: PEARSON

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Chapter 7.6, Problem 34STQ

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Chapter 7.6, Problem 33STQ

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Java: An Introduction to Problem Solving and Programming (8th Edition)

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Chapter 7.6, Problem 34STQ

Solution Summary: The author explains the “strokePolygon” method, which is one method of “GraphicsCon”.

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