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Learn how to scale images and how to rotate and translate images using the AffineTransform class.

Revised: Mon Apr 04 09:24:13 CDT 2016

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Table of contents

Preface

This module is one of a series of modules designed to teach you about Object-Oriented Programming (OOP) using Java.

The program described in this module requires the use of the Guzdial-Ericson multimedia class library. You will find download, installation, and usageinstructions for the library at Java OOP: The Guzdial-Ericson Multimedia Class Library .

Viewing tip

I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the Figures and Listings while you are reading about them.

Figures

Listings

  • Listing 1 . The driver class named Prob01.
  • Listing 2 . Beginning of the class named Prob01Runner.
  • Listing 3 . The run method.
  • Listing 4 . Beginning of the method named rotatePicture.
  • Listing 5 . Compute the dimensions of the new Picture object.
  • Listing 6 . Prepare the translation transform.
  • Listing 7 . Concatenate the transforms.
  • Listing 8 . Instantiate the new Picture object .
  • Listing 9 . Perform the concatenated transform.
  • Listing 10 . Complete program listing.

Preview

In this module, you will learn how to scale images and how to rotate and translate images using the AffineTransform class.

Program specifications

Write a program named Prob01 that uses the class definition shown in Listing 1 and Ericson's media library along with the image file named Prob01.jpg (see Figure 1 ) to produce the output images shown in Figure 2 and Figure 3 .

Figure 1 - Input file named Prob01.jpg.

Image of a beach scene.

Figure 2 - First output image.

Image of the beach scene in a PictureExplorer object.

Figure 3 - Second output image.

Scaled and rotated version of the beach scene.

Scale and rotate

The image from the file named Prob01.jpg must be scaled and then rotated 30 degrees clockwise. A scale factor of 0.95 must be applied to thehorizontal and a scale factor of 0.9 must be applied to the vertical.

New classes

You may define new classes as necessary to cause your program to behave as required, but you may not modify the class definition for the class named Prob01 shown in Listing 1 .

Required output text

In addition to the two output images mentioned above, your program must display your name and the other line of text shown in Figure 4 on the command-line screen.

Figure 4 - Required output text.
Display your name here. Picture, filename None height 360 width 394

General background information

Writing the code from scratch to rotate an image can be a daunting task. However, the task is made much easier through the use of the standard AffineTransform class, which is included in the standard Java library.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
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John Reply
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
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Can you compute that for me. Ty
Jude
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David
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what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
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Adjanou
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Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
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Maurice Reply
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Maurice
answer
Magreth
progressive wave
Magreth
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Mohammed
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Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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