Schwartz 1 5 3 – Template Based Graphics Code Generator

4.3.1. Dynamically Created Static Local Pages from Python¶

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For the rest of this chapter, the example files will come from thewww directory under the main examples directory you unzipped. Iwill refer to example file there as 'example www files'.

I personally like is that with this CSS code generator I can easily create numerous graphic styles and immediately get their code or code of separate elements within seconds., EnjoyCSS gives access to a gallery with ready-made solutions from text effects to art and templates. Audirvana plus 2 5 1 3 download free. It is a powerful CSS online generator that I recommend to others!

Schwartz 1 5 3 – Template Based Graphics Code Generator Free

Make beautiful data visualizations with Canva's graph maker. Unlike other online graph makers, Canva isn't complicated or time-consuming. There's no learning curve – you'll get a beautiful graph or diagram in minutes, turning raw data into something that's both visual and easy to understand. Piktochart is an infographic maker that makes it easy to design high quality creative infographics. Choose from over 280 editable infographic templates. Schwartz 1.5.4 – Template-based graphics code generator. May 30, 2016 Schwartz is a developer tool that takes the pain out of writing complex graphics-drawing code. In brief, when a code generator receives a node start event from the graph traverser, the code generator will load all the templates in the template set that start with the node type. This makes the generators potentially a bit slower, but it allows for unlimited numbers of templates for a given node type.

As the overview indicated, dynamic web applications typicallyinvolve getting input from a web page form, processing the inputin a program on the server, and displaying output to a web page.Introducing all these new ideas at once could be a lot to absorb,so this sectionuses familiar keyboard input into a regular Python programand then, like in the final version,processes the input and produces the final web page output.

Follow this sequence of steps:

1. Open the example www file hello.html in your browser, to see whatit looks like.
2. Change your browser view - for instance go back to the previouspage you displayed.
3. Open the same hello.html file in Kompozer, if that works for you,or another editor that will show the html source, as discussed inHTML Source Markup.
4. If using Kompozer, switch to the Source view (clicking the Source tab).Sometimes you will want to copy HTML text into a Python program.For instance, I selected and copied the entire contents of thehello.html source view and pasted it into a multi-line string inthe Python program shown and discussed below.
5. Careful, note the change from past practice here: Start Pythonfrom inside the www directory. In Windows you may start Idle withthe IdleOnWindows shortcutthat I placed in the www directory, not the original exampledirectory.
6. Open the www example program helloWeb1.py in an Idleedit window.
7. Run it.

You should see a familiar web page appear in yourdefault browser (possibly not the one you have been using). Thisis obviously not a very necessary program, since you can selectthis page directly in your browser! Still, one step at a time: itillustrates several useful points. The program is copied below.Read it:

This program encapsulates two basic operations into the last twofunctions that will be used over and over. The first,strToFile, has nothing new, it just puts specified text in afile with a specified name. The second, browseLocal, does more.It takes specified text (presumably a web page), puts it in a file,and directly displays the file in your default web browser. It uses theopen function from the webbrowser module to start the newpage in your web browser.

The open function here requires the name of afile or URL. Since the page is automatically generated by the programfor one-time immediate viewing, it automatically usesthe same throwaway filename, tempBrowseLocal.htmlspecified as the default in the keyword parameter. If youreally want another specific, name you could pass it as a parameter.

In this particular program the text that goes in the file is justcopied from the literal string named contents in the program.

This is no advance over just opening the file in the browserdirectly! Still, it is a start towards the aim of creating webcontent dynamically.

An early example in this tutorial displayed the fixedHelloWorld!' to the screen. This was later modified inhello_you4.py to incorporate user input using the string formatmethod of Dictionaries and String Formatting,

Similarly, I can turn the web page contents into a format string,and insert user data. Load and run the www example programhelloWeb2.py.

The simple changes from helloWeb1.py are marked at thebeginning of the file and shown below. I modified the web page textto contain ‘Hello, {person}!' in place of ‘Hello, World!',making the string into a format string, which I renamed to themore appropriate pageTemplate. The changed initial portion withthe literal string and and the main program then becomes

Now the line

incorporaties the person's name into the contents for the web pagebefore saving it to a file and displaying it.

In this case, I stored the literal format string inside the Pythonprogram, but consider a different approach:

Load and run the www example program helloWeb3.py. It behavesexactly like helloWeb2.py, but is slightly different internally -it does not directly contain the web page template string. Insteadthe web page template string is read from the filehelloTemplate.html.

Below is the beginning of helloWeb3.py, showing the only newfunctions. The first, fileToStr, will be a standard functionused in the future. It is the inverse of strToFile.

The main program obtains the input. In this simple example, theinput is used directly, with little further processing. It isinserted into the web page, using the file helloTemplate.htmlas a format string.

Although helloTemplate.html is not intended to be viewed by theuser (being a template), you should open it in a browser or web editor(Kompozer or ..) to look at it. It is legal to create a web page in a webpage editor with expressions in braces embedded in it! If you lookin the source view in Kompozer or in a web source editor,you will see something similar tothe literal string in helloWeb2.py, except the lines are broken updifferently. (This makes no difference in the formatted result,since in html, all white space is considered the same.)

Back in the Normal mode in Kompozer, or in source mode for any html editor, add anextra line of text right after the line 'Hello, {person}!'.Then save the file again (under the samename). Run the program helloWeb3.py again, and see that youhave been able to change the appearance of the output withoutchanging the Python program itself. That is the aim of using thetemplate html page, allowing the web output formatting to bemanaged mostly independently from the Python program.

A more complicated but much more common situation is where theinput data is processed and transformed into results somehow, andthese results, often along with some of the original input, areembedded in the output web page that is produced.

As a simple example, load and run the www example programadditionWeb.py, which uses the template fileadditionTemplate.html.

The aim in the end of this chapter is to have user input come froma form on the web rather than the keyboard on a local machine, butin either case the input is still transformed into results and allembedded in a web page. To make parts easily reusable, I obtainthe input in a distinct place from where the input isprocessed. In keeping with the later situation with web forms,all input is of string type (using keyboard input for now).

Look at the program. You will see only a few new lines! Because ofthe modular design, most of the program is composed of recentstandard functions reused.

The only new code is at the beginning and is shown here:

The input is obtained (via input for now), and it is processedinto a web page string, and as a separate step it is displayed in alocal web page.

There are a few things to note:

• All input is strings. Before the numerical calculations, thedigit strings must be converted to integers.
• I do calculate (a very simple!) result and use it in the outputweb page.
• Although it is not in the Python code, an important part of theresult comes from the web page format string inadditionTemplate.html, which includes the needed variable names inbraces, {num1}, {num2}, and {total}. View it in your browseror in a web editor.

When you write your own code, you might modify additionWeb.py,or you can start from a stripped down skeleton in the example www folder,skeletonForWeb.py, with comments about whereto insert your special code.

We will examine the bottom part of the following diagram later.The top part outlines the flow of data from string input toweb page in your browser for a regular Python program likewhat we have been describing, with the processing outlined in themiddle line. The parts in the middle will be common to the laterclient/server program, that manges input and output with the bottom line,that we will discuss later.

Again, this last section was somewhat artificial. You are not in the endlikely to find such programs practical as end products. Howeversuch programs are reasonable to write and test and they include almost allthe code you will need for a more practical (but harder to debug)CGI program, coming next..

4.3.1.1. Quotient Web Exercise¶

* Save additionWeb.py or skeletonForWeb.pyasquotientWeb.py. Modify it todisplay the results of a division problem in a web page.As in the exercises in Chapter 1, display a full sentencelabeling the initial data and both the integer quotient and the remainder.You cantake your calculations from Quotient String Return Exercise.You shouldonly need to make Python changes to the processInput andmain functions. You will also need the HTML for the output pagedisplayed. Make a web page template file calledquotientTemplate.html and read it into your program.Turn in both quotientWeb.py and quotientTemplate.html.

• Matlab Tutorial

• MATLAB Advanced

• MATLAB Useful Resources

• Selected Reading

To plot the graph of a function, you need to take the following steps −

• Define x, by specifying the range of values for the variable x, for which the function is to be plotted

• Define the function, y = f(x)

• Call the plot command, as plot(x, y)

Following example would demonstrate the concept. Let us plot the simple function y = x for the range of values for x from 0 to 100, with an increment of 5.

Create a script file and type the following code −

When you run the file, MATLAB displays the following plot −

Let us take one more example to plot the function y = x². In this example, we will draw two graphs with the same function, but in second time, we will reduce the value of increment. Please note that as we decrease the increment, the graph becomes smoother.

Create a script file and type the following code −

When you run the file, MATLAB displays the following plot −

Change the code file a little, reduce the increment to 5 −

MATLAB draws a smoother graph −

Adding Title, Labels, Grid Lines and Scaling on the Graph

MATLAB allows you to add title, labels along the x-axis and y-axis, grid lines and also to adjust the axes to spruce up the graph.

• The xlabel and ylabel commands generate labels along x-axis and y-axis.

• The title command allows you to put a title on the graph.

• The grid on command allows you to put the grid lines on the graph.

• The axis equal command allows generating the plot with the same scale factors and the spaces on both axes.

• The axis square command generates a square plot.

Example

Create a script file and type the following code −

MATLAB generates the following graph −

Drawing Multiple Functions on the Same Graph

You can draw multiple graphs on the same plot. The following example demonstrates the concept −

Example

Create a script file and type the following code −

MATLAB generates the following graph −

Setting Colors on Graph

MATLAB provides eight basic color options for drawing graphs. The following table shows the colors and their codes −

Example

Let us draw the graph of two polynomials

• f(x) = 3x⁴ + 2x³+ 7x² + 2x + 9 and

• g(x) = 5x³ + 9x + 2

Create a script file and type the following code −

When you run the file, MATLAB generates the following graph −

Setting Axis Scales

The axis command allows you to set the axis scales. You can provide minimum and maximum values for x and y axes using the axis command in the following way −

The following example shows this −

Example

Create a script file and type the following code −

When you run the file, MATLAB generates the following graph −

Generating Sub-Plots

When you create an array of plots in the same figure, each of these plots is called a subplot. The subplot command is used for creating subplots.

Ommwriter free. Syntax for the command is −

Schwartz 1 5 3 – Template Based Graphics Code Generator Download

where, m and n are the number of rows and columns of the plot array and p specifies where to put a particular plot.

Each plot created with the subplot command can have its own characteristics. Following example demonstrates the concept −

Example

Let us generate two plots −

y = e^−1.5xsin(10x)

y = e^−2xsin(10x)

Create a script file and type the following code −

When you run the file, MATLAB generates the following graph −