Pro Audio Equipment

By admin 　http://www.teamrisk.com/multi-pattern/

Question about cutting sewing pattern?

I have been getting some great advise from here, I just finished my first project (is a kid’s top) last weekend, and i have 2 questions hopefully to get some help:

Simple answer first: yes, you can easily adjust the length of a top. If it’s a straight cut, just add the desired amount to the bottom. If the cut isn’t straight, add the length at the waist. Cut your pattern there (all pieces that deal with that area) and tape some tissue paper in to make the whole thing the right length. (If it’s 2″ too short, add 2″ of tissue paper.) Some patterns even give lengthen/shorten lines. That will be two horizontal lines set very close. Cut between them.

For using a multi-size pattern again for a different size, get tissue paper and tape it together to make a piece as big as your pattern piece. (If it’s a kids’ pattern, just use a single sheet of tissue paper, of course.) Trace the size you want onto the tissue paper and cut that out instead. Transfer any applicable markings so you won’t get lost.

Cad Trion 6000 Multi-pattern Condenser Microphone $299.00

Audio-Technica AT2050 Multi-Pattern Condenser Mic -NEW! $229.00

RODE NT2A Multi Pattern 1″ Condenser Microphone $274.29

RODE NT2A Multi Pattern 1″ Condenser Microphone $274.29

Neumann U 87 AI Multi-pattern Microphone +K 67 capsule $3,249.00

Neumann Tlm 170 R Multi-pattern Microphone +K89 capsule $3,199.00

Studio Projects C3 Condenser Microphone – multi pattern $75.00

Audio Technica AT4047MP Multi-Pattern Condenser Mic NEW $699.00

Audio Technica AT4050 Multi-Pattern Condenser Mic- New! $499.00

Samson C03 Multi-Pattern Condenser Microphone $39.99

Blue Kiwi Large Diam Multi-Pattern Condenser Microphone $1,989.00

Sennheiser Mkh 800 Multi-pattern condenser Microphone $3,490.00

CAD TRION6000 MULTI-PATTERN CONDENSER MICROPHONE NEW $196.99

CAD TRION 8000 MULTI-PATTERN Tube Microphone BRAND NEW! $349.99

Condenser,Mic,Fender,GT57,Studio,FET,Multi-Pattern,New $480.00

CAD Trion 6000 Multi-pattern Condenser Microphone $299.00

SAMSON CL8 MULTI-PATTERN CONDENSER MICROPHONE $100.00

Audix CX212 Large Diaphragm Condenser Multi-Pattern $499.99

MXL 2010 Multi-Pattern Studio Condenser Mic Microphone $169.99

Blue Cactus Multi Pattern Tube Condenser Microphone $1,875.00

Blue Cactus Multi Pattern Tube Condenser Microphone B $1,899.00

Audio Technica AT4047MP Multi-pattern Condenser Mic $699.00

New MXL 2010 Multi-Pattern Studio Microphone Mic $169.95

CAD Trion 8000 Multi-Pattern Studio Tube Mic. New!!! $324.00

Blue Kiwi Large Diam Multi-Pattern Condenser Microphone $1,989.95

CAD Trion 6000 Multi-Pattern Condenser Studio Mic $199.99

CAD M179 Dual Diaphragm Multi-Pattern Condenser Mic $199.99

CAD TRION 8000 MULTI PATTERN CONDENSER TUBE MICROPHONE $399.99

CAD TRION 6000 MULTI PATTERN CONDENSER TUBE MICROPHONE $299.99

CAD EQUITEK E300 MULTI PATTERN CONDENSER MICROPHONE $299.99

Blue Kiwi Large Diam Multi-Pattern Condenser Microphone $1,989.95

NADY SCM-1000 MULTI-PATTERN CONDENSER MICROPHONE $65.00

CAD GXL3000 Multi Pattern Condenser Microphone $119.99

Neumann TLM170 multi-pattern large-Diaphragm Condenser $2,000.00

Karma: K-35 AFET Multi-Pattern Condenser Microphone $199.00

PELUSO 2247 SE AMERICAN TUBE MULTI PATTERN MICROPHONE!! $1,671.85

SAMSON C03 MULTI-PATTERN CONDENSER MICROPHONE $49.99

Blue*Snowball Yeti+HEADPHONE*USB Multi-Pattern Mic NEW $134.10

M-Audio Sputnik Large Multi-Pattern Tube Condenser Mic $699.00

Rode K2 Tube Multi Pattern Condenser Studio Microphone $495.00

Command Design Pattern

Command pattern is a separation of following paticipants to carry out some task:

Client – Who wants the task done (our program, like main(…) method)
Invoker - Who initiates a task
Receiver – Who listenes to the command and carries out the task.
Command - interface for execution between invoker and receiver.
ConcreteCommand – implementation of Command. Holds the parameters required to carry out the operation.

Now look at the code snippet below( taken from GOF http://www.dofactory.com/Patterns/PatternCommand.aspx)

// Command pattern — Real World example

using System;
using System.Collections;

namespace DoFactory.GangOfFour.Command.RealWorld
{

  // MainApp test application

  class MainApp
  {
    static void Main()
    {
      // Create user and let her compute
      User user = new User();

      user.Compute(’+', 100);
      user.Compute(’-', 50);
      user.Compute(’*', 10);
      user.Compute(’/', 2);

      // Undo 4 commands
      user.Undo(4);

      // Redo 3 commands
      user.Redo(3);

      // Wait for user
      Console.Read();
    }
  }

  // “Command”

  abstract class Command
  {
    public abstract void Execute();
    public abstract void UnExecute();
  }

  // “ConcreteCommand”

  class CalculatorCommand : Command
  {
    char @operator;
    int operand;
    Calculator calculator;

    // Constructor
    public CalculatorCommand(Calculator calculator,
      char @operator, int operand)
    {
      this.calculator = calculator;
      this.@operator = @operator;
      this.operand = operand;
    }

    public char Operator
    {
      set{ @operator = value; }
    }

    public int Operand
    {
      set{ operand = value; }
    }

    public override void Execute()
    {
      calculator.Operation(@operator, operand);
    }

    public override void UnExecute()
    {
      calculator.Operation(Undo(@operator), operand);
    }

    // Private helper function
    private char Undo(char @operator)
    {
      char undo;
      switch(@operator)
      {
        case ‘+’: undo = ‘-’; break;
        case ‘-’: undo = ‘+’; break;
        case ‘*’: undo = ‘/’; break;
        case ‘/’: undo = ‘*’; break;
        default : undo = ‘ ‘; break;
      }
      return undo;
    }
  }

  // “Receiver”

  class Calculator
  {
    private int curr = 0;

    public void Operation(char @operator, int operand)
    {
      switch(@operator)
      {
        case ‘+’: curr += operand; break;
        case ‘-’: curr -= operand; break;
        case ‘*’: curr *= operand; break;
        case ‘/’: curr /= operand; break;
      }
      Console.WriteLine(
        ”Current value = {0,3} (following {1} {2})”,
        curr, @operator, operand);
    }
  }

  // “Invoker”

  class User
  {
    // Initializers
    private Calculator calculator = new Calculator();
    private ArrayList commands = new ArrayList();

    private int current = 0;

    public void Redo(int levels)
    {
      Console.WriteLine(”n—- Redo {0} levels “, levels);
      // Perform redo operations
      for (int i = 0; i       {
        if (current         {
          Command command = commands[current++] as Command;
          command.Execute();
        }
      }
    }

    public void Undo(int levels)
    {
      Console.WriteLine(”n—- Undo {0} levels “, levels);
      // Perform undo operations
      for (int i = 0; i       {
        if (current > 0)
        {
          Command command = commands[--current] as Command;
          command.UnExecute();
        }
      }
    }

    public void Compute(char @operator, int operand)
    {
      // Create command operation and execute it
      Command command = new CalculatorCommand(
        calculator, @operator, operand);
      command.Execute();

      // Add command to undo list
      commands.Add(command);
      current++;
    }
  }
}

Here Main(…) is the client

Client asks User (Invoker) to carry out some task (Calculations by Compute(…) method)

   User knows about Calculator (Receiver) who will do the calculation and command which is an interface to call the required calculation operation (Execute or Unexecute).
   But what calculation is to be done is known to Client. Client asks (or issues commands) User to do some +, – , *, / operations.

User records these commands in an array and calls command.Execute or UnExecute. the implementation(CalculatorCommand) knows well how to do the opertaion.

* Now here comes the use of command. If there is need to undo upto some level, user has a record of what commands were issued. It will just call the receiver (CalculatorCommand) to carry out same commands in reverse.

 Uses for the Command pattern

Command objects are useful for implementing:

Multi-level undo:  If all user actions in a program are implemented as command objects, the program can keep a stack of the most recently executed commands. When the user wants to undo a command, the program simply pops the most recent command object and executes its undo() method.

Transactional behavior  Undo is perhaps even more essential when it’s called rollback and happens automatically when an operation fails partway through. Installers need this and so do databases. Command objects can also be used to implement two-phase commit.

Progress bars  Suppose a program has a sequence of commands that it executes in order. If each command object has a getEstimatedDuration() method, the program can easily estimate the total duration. It can show a progress bar that meaningfully reflects how close the program is to completing all the tasks.

Wizards  Often a wizard presents several pages of configuration for a single action that happens only when the user clicks the “Finish” button on the last page. In these cases, a natural way to separate user interface code from application code is to implement the wizard using a command object. The command object is created when the wizard is first displayed. Each wizard page stores its GUI changes in the command object, so the object is populated as the user progresses. “Finish” simply triggers a call to execute(). This way, the command class contains no user interface code.

GUI buttons and menu items  In Swing and Borland Delphi programming, an Action is a command object. In addition to the ability to perform the desired command, an Action may have an associated icon, keyboard shortcut, tooltip text, and so on. A toolbar button or menu item component may be completely initialized using only the Action object.

Thread pools  A typical, general-purpose thread pool class might have a public addTask() method that adds a work item to an internal queue of tasks waiting to be done. It maintains a pool of threads that execute commands from the queue. The items in the queue are command objects. Typically these objects implement a common interface such as java.lang.Runnable that allows the thread pool to execute the command even though the thread pool class itself was written without any knowledge of the specific tasks for which it would be used.

Macro recording  If all user actions are represented by command objects, a program can record a sequence of actions simply by keeping a list of the command objects as they are executed. It can then “play back” the same actions by executing the same command objects again in sequence. If the program embeds a scripting engine, each command object can implement a toScript() method, and user actions can then be easily recorded as scripts.

Networking  It is possible to send whole command objects across the network to be executed on the other machines, for example player actions in computer games.

Parallel Processing  Where the commands are written as tasks to a shared resource and executed by many threads in parallel (possibly on remote machines -this variant is often referred to as the Master/Worker pattern)

Mobile Code  Using languages such as Java where code can be streamed/slurped from one location to another via URLClassloaders and Codebases the commands can enable new behavior to be delivered to remote locations (EJB Command, Master Worker)

References:

GOF official site:
http://www.dofactory.com/Patterns/PatternCommand.aspx

Wikipidea
http://en.wikipedia.org/wiki/Command_pattern

About the Author

Software developer in India