Plotting data

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Java1468-plotting engineering and scientific data using java

1 Table of contents

7 The Graph01Demo program

8 Using the plotting program with your data

9 The Graph01 program

10 Discussion and sample code

11 Testing the plotting program

12 Using the plotting program

13 Plotting your data using Graph01

14 Modifying plotting parameters

15 The plotting parameters

16 The labels on the axes

17 Keep the pixels in mind

18 The interface named GraphIntfc01

19 Implementing graphintfc01

20 The method named getnmbr

21 The methods named f1, f2, f3, f4, and f5

22 One plotting area per method

23 How does it work?

24 Doesn't know and doesn't care

25 Computed "on the fly"

26 Returned from an array

27 From a disk file, a database, the internet, etc.

28 It is up to you

29 The class named Graph01Demo

30 Defining data-generator classes

31 The number of functions to plot

32 The method named f1

33 The method named f2

34 The method named f3

35 The method named f4

36 The method named f5

37 The end of the class definition

38 The class named Dsp002

39 A DSP example

40 White random noise

41 A convolution filter

42 The convolution filter output

43 Time-domain vs. frequency-domain

44 Frequency spectrum analysis

45 The white noise spectrum

46 The filtered noise spectrum

47 Two spectral peaks are visible

48 What does the symmetry mean?

49 An ambiguity in the spectrum analysis

50 Let's see some code

51 Different from the previous example class

52 Basic operation of the program

53 Beginning of the class named Dsp002

54 Create data arrays

55 Beginning of the constructor

56 The random noise generator seed

57 Create the convolution operator

58 Apply the convolution operator

59 Compute spectrum of each of two traces

60 All results have been computed and saved

61 The getNmbr method

62 The method named f1

63 Convert incoming parameter to an index

64 Stay within array bounds

65 Methods f2 through f5

66 The class named Convolve01

67 The discrete Fourier transform (dft)

68 Two plotting programs

69 The program named Graph01

70 Some general comments

71 Separate plotting areas

72 A noarg constructor is required

73 Some methods may not be called

74 The visual appearance

75 A test class

76 Usage instructions

77 Plotting parameters

78 A new object

79 Requires java sdk 1.4 or later

80 Will discuss in fragments

81 The class named Graph01

82 Beginning of the class named GUI

83 Beginning of the constructor for the GUI class

84 Array to hold Canvas objects

85 Routine GUI construction code

86 The Canvas objects

87 More routine construction code

88 Force a repaint

89 End of the constructor

90 Re-plotting the data

91 A new object of the target class

92 The remainder of the event handler

93 Beginning of the class named MyCanvas

94 Floating data vs. pixels

95 A simple constructor

96 Beginning of the overridden paint method

97 Get old coordinate values

98 The initial y-coordinate value

99 Plot the points

100 The drawAxes method

101 Drawing tic marks

102 The getTheX and getTheY methods

103 The test class named junk

104 The program named Graph02

105 Run the program

107 Complete program listings

108 Miscellaneous

Java1489-plotting 3d surfaces using java

1 Table of contents

6 General Discussion

7 Displaying 3D data can be fairly difficult

8 Different approaches are available

9 A 3D plotting program

10 Grayscale plot

11 A calibration scale

12 Color Shift plot

13 More information is conveyed

14 The lowest elevations are obvious in the color shift plot

15 Four minor peaks are obvious in the color shift plot

16 The highest elevation is obvious in the color shift plot

17 Quantitative estimates are possible

18 Color Contour plot

19 Similar to a contour map

20 More minor peaks

21 The design of this program

22 Good quantitative elevation information is available

23 The elevations of the minor peaks

24 The lowest elevations

25 The elevation of the valleys

26 A logarithmic conversion

27 Flattens the plot

28 More sample output

29 Six different formats

30 Isolates the location of the minima

31 The log of the surface is flatter

32 Multiple plotting formats are useful

33 Extremely easy to use

34 Multiple plots

45 Display = 3, 4, and 5

46 A calibration scale

47 Normalization

48 For display value of 0 or 3

49 For display value of 1 or 4

50 For a display value of 2 or 5

51 The main method

52 A 3D parabola

53 The calibration scale

54 The images are stacked

55 With and without axes

56 A window listener

58 The program named ImgMod29

59 The main method

60 Local variables

61 The array for the surface elevation data

62 The blocksize parameter

63 A 3D parabolic surface

64 Display six surface images

65 Just instantiate an object

66 The parameters

67 Instantiate six separate objects

68 The ImgMod29 class

69 Establish display format for log conversion

70 The three basic types

71 Copy the input elevation data

72 Convert to log data if required

73 New to j2se 5.0

74 Normalize the surface elevation data

75 The method named scaleTheSurfaceData

76 Create an appropriate pair of Canvas objects

77 The interesting code

78 Add the Canvas objects to the Frame

79 Call the pack method and set the title

80 Register an anonymous WindowListener object

81 Six different inner classes

82 Subclasses of the canvas class

83 The getCenter method

84 Even or odd is very important

85 Grayscale plot format

86 The constructor

87 Overridden paint method for CanvasType0surface class

88 Purpose of overridden paint method

89 Instantiate a Color object

90 Set colors and draw squares

91 Paint a colored square

92 Draw the optional red axes

93 Beginning of the class named CanvasType0scale

94 How it works

95 The overridden paint method

96 Color Shift plot format

97 Beginning of the class named CanvasType1surface

98 Overridden paint Method

99 Set white and black for max and min values

100 Elevations other than the extreme ends

101 Processing the lowest range

102 Scale the elevation values

103 The color aqua

104 Processing the other three ranges

105 Gradient from aqua to green

106 Gradient from green to yellow

107 Gradient from yellow to red

108 A homework assignment

109 The rest of the overridden paint method

110 The class named CanvasType1scale

111 Color Contour plot format

112 The color palette

113 The getcolorpalette method

114 Rearrange and add new colors

115 The CanvasType2surface class

116 Quantize the elevation levels

117 Set the color value

118 The class named CanvasType2scale

119 Run the program

121 Complete program listing

122 Miscellaneous

Java1492-plotting large quantities of data using java

1 Table of contents

7 Sample output for PlotALot01 class

8 Usage information

9 Plotting format

10 On to the next page

11 Nearly unlimited plotting capacity

12 Millions of data values plotted

13 Two sample pages

14 Two overloaded constructors

15 Can change default plotting parameters

16 Control over the plotting parameters

17 Default plotting parameters in Figure 1

18 Explanation of terms

19 Location of the stack of plots

20 Sample output for PlotALot02 class

21 Superimposed data

22 Same data, different sign

23 Plotting parameters were controlled

24 Larger ovals

25 Horizontal scaling was greater

26 Sample output for PlotALot03 class

27 Same data, two colors

28 The plotting parameters

29 Sample output for PlotALot04 class

30 Same data, three colors

31 The plotting parameters

32 Sample programs

33 The class named PlotALot01

34 Purpose of the class

35 Usage information

36 Different plotting objects

37 Can plot a large number of data values

38 Multiple page objects

39 A stack of page objects

40 Multiple traces on each page object

41 Two overloaded constructors

42 Constructor parameters

43 Two plotting objects for test purposes

44 The data to be plotted

45 Transition from trace to trace on the same page

46 Transition from page to page

47 Proper locations for awt frame under winxp

48 Information about plotting parameters

49 Overloaded plotdata method

50 A windowlistener for program termination

51 J2se 5.0 is required

52 Let's see some code!

53 Beginning of the class named PlotALot01

54 Instantiate two plotting objects

55 Feed the plotting object titled "A"

56 White random noise

57 Plot the data

58 Feed and plot the object titled "B"

59 The three steps

60 Some instance variables

61 The first overloaded constructor

62 Save the parameter values

63 The exception

64 A temporary Page object

65 Display some information

66 Terminate on negative value for sampspacing

67 Dispose of the temporary Page object

68 Compute and display the remaining plotting parameters

69 Terminate on zero traces per page

70 Instantiate first usable Page object

71 The other overloaded constructor

72 The default plotting parameter values

73 The feedData method

74 Scaling of data to be plotted

75 Is the page full?

76 Save the data value for plotting later

77 The MyCanvas class, a preview

78 Call the putdata method to store the data value

79 The plotData method

80 Two overloaded versions

81 Specify the location of the stack

82 Make certain that the last page is visible

83 Make all pages invisible

84 Make the pages visible in reverse order

85 Set the location of the stack

86 The other overloaded version of the plotData method

87 The Page class

88 Potentially many page objects...

89 The constructor for the page class

90 An anonymous terminator for the Page class

91 The putData method of the Page class

92 The MyCanvas class

93 The overridden paint method

94 Draw the horizontal axes

95 Plot the points

96 A vertical offset

97 Draw an oval

98 Is positive vertical up or down?

99 Connect the points with straight lines

100 End of the PlotALot01 class

101 The class named PlotALot02

102 Designed for two-channel data

103 Three steps to use the class

104 A stack of page objects

105 Testing with the main method

106 Some data is not random

107 The class named PlotALot02 and the main method

108 Two data values are required

109 The feedData method

110 The putData method

111 The MyCanvas class

112 The overridden paint method

113 Setting the drawing color

114 New code in the overridden paint method

115 End of class plotalot02

116 The class named PlotALot03

117 Two-channel data on alternating axes

118 Three steps for using the class

119 A stack of page objects

120 Alternating axes

121 Testing with the main method

122 Some data is not random

123 Modified constructor code

124 The overridden paint method

125 Some code was deleted for brevity

126 End of class plotalot03

127 The class named PlotALot04

128 Three steps for using the class

129 A stack of page objects

130 Testing with the main method

131 Run the programs

133 Complete program listings

134 Miscellaneous

Source: OpenStax, Digital signal processing - dsp. OpenStax CNX. Jan 06, 2016 Download for free at https://legacy.cnx.org/content/col11642/1.38

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