A “DoubleSizePicture” program Program plan: In the file “ Picture.java ”, import necessary packages, and create a class “ Picture”, Declare necessary variables. Define the constructor to construct a blank picture. Define a method “getWidth()” to get the width of this picture. Define a method “getHeight()” to get the height of this picture. Define a method “load()” to load a picture from a given source. Define a method “reload()” to reload the picture. Define a method “pick()” to display a file chooser for picking a picture. Define a method “move()” to move the picture by the given amount in x and y direction. Define a method “scale()” to scale the picture to a new size. If the new size is smaller than the old size, the remainder is filled with transparent pixels. If it is larger, it is clipped. Define a method “border()” to add a black border to the image. Define a method “getColorAt()” to get the color of a pixel. Define a method “setColorAt()” to set the color of a pixel. Define a method “setImage()” to set the image. In the file “ DoubleSizePicture.java ”, create a class “ DoubleSizePicture”, Define the “main()” method, Construct a blank picture and load image. Call the method “load()” to load the picture. Compute the center position. Call the method “move()” to shift the picture left and up to clip off the left and top quarter of the original. Compute the updated width and height Call the method “scale()” to scale the picture to half size.

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Chapter 2, Problem 17PE

Program Plan Intro

A “DoubleSizePicture” program

Program plan:

In the file “Picture.java”, import necessary packages, and create a class “Picture”,

Declare necessary variables.

Define the constructor to construct a blank picture.

Define a method “getWidth()” to get the width of this picture.

Define a method “getHeight()” to get the height of this picture.

Define a method “load()” to load a picture from a given source.

Define a method “reload()” to reload the picture.

Define a method “pick()” to display a file chooser for picking a picture.

Define a method “move()” to move the picture by the given amount in x and y direction.

Define a method “scale()” to scale the picture to a new size. If the new size is smaller than the old size, the remainder is filled with transparent pixels. If it is larger, it is clipped.

Define a method “border()” to add a black border to the image.

Define a method “getColorAt()” to get the color of a pixel.

Define a method “setColorAt()” to set the color of a pixel.

Define a method “setImage()” to set the image.

In the file “DoubleSizePicture.java”, create a class “DoubleSizePicture”,

Define the “main()” method,

Construct a blank picture and load image.

Call the method “load()” to load the picture.

Compute the center position.

Call the method “move()” to shift the picture left and up to clip off the left and top quarter of the original.

Compute the updated width and height

Call the method “scale()” to scale the picture to half size.

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