# SOME DESCRIPTIVE TITLE # Copyright (C) YEAR Free Software Foundation, Inc. # This file is distributed under the same license as the PACKAGE package. # FIRST AUTHOR , YEAR. # # msgid "" msgstr "" "Project-Id-Version: PACKAGE VERSION\n" "POT-Creation-Date: 2013-11-11 09:56+0100\n" "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" "Last-Translator: FULL NAME \n" "Language-Team: LANGUAGE \n" "Language: \n" "MIME-Version: 1.0\n" "Content-Type: text/plain; charset=UTF-8\n" "Content-Transfer-Encoding: 8bit\n" #. type: One-char language identifier #: train702.languagecode:1 #, no-wrap msgid "E" msgstr "R" #. type: Title-text #: train702/scene.txt:1 #, no-wrap msgid "train702:Remote control #4" msgstr "train702:Дистанционное управление #4" #. type: Resume-text #: train702/scene.txt:2 #, no-wrap msgid "train702:Remote control a bot without using an information exchange post by defining a class for the orders." msgstr "train702:Дистанционное управление ботом без использования поста обменом информацией, используя только статичные классы для заявок." #. type: ScriptName-text #: train702/scene.txt:3 #, no-wrap msgid "train702:Remote4" msgstr "train702:Remote4" #. type: \b; header #: train702-help/tremote4.txt:1 #, no-wrap msgid "Exercise" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:3 #, no-wrap msgid "Remote control a slave robot without using an information exchange post. The robot should pass over the 6 blue crosses. You must use a static variable to pass the orders to the slave bot." msgstr "" #. type: Plain text #: train702-help/tremote4.txt:5 #, no-wrap msgid "The two main actors of this exercise are:\n" msgstr "" #. type: Bullet: '1)' #: train702-help/tremote4.txt:5 #, no-wrap msgid "The wheeled grabber without an energy pack and therefore immobile. This is the master you should program so it will transmit orders to the slave." msgstr "" #. type: Bullet: '2)' #: train702-help/tremote4.txt:6 #, no-wrap msgid "The slave practice bot which is already programmed and just waits for orders from the master." msgstr "" #. type: \b; header #: train702-help/tremote4.txt:8 #, no-wrap msgid "The slave" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:10 #, no-wrap msgid "First of all we must understand how the program of the slave works. The class order contains two members: m_type is the order to execute (move or turn) and m_param is the distance to move or the rotation angle¦:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:12 #, no-wrap msgid "public class order" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:16 #, no-wrap msgid "" "{\n" "\tint m_type = nan;\n" "\tfloat m_param;\n" "}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:18 #, no-wrap msgid "A second class exchange contains the mechanism for exchanging the orders. We declare a static class member m_order which will contain the order to be executed. The word static insures that the member m_order is shared between all instances of the class exchange." msgstr "" #. type: Plain text #: train702-help/tremote4.txt:20 #, no-wrap msgid "public class exchange" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:22 #, no-wrap msgid "" "{\n" "\tstatic private order m_order = new order;" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:24 #, no-wrap msgid "The put method will be used by the master robot for transmitting an order. As long as m_order is different from nan, the slave has not finished the order and the put method will return false and will do nothing¦:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:26 #, no-wrap msgid "\tsynchronized bool put(order a)" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:37 #, no-wrap msgid "" "\t{\n" "\t\tif ( m_order.m_type == nan )\n" "\t\t{\n" "\t\t\tm_order = a;\n" "\t\t\treturn true;\n" "\t\t}\n" "\t\telse\n" "\t\t{\n" "\t\t\treturn false;\n" "\t\t}\n" "\t}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:39 #, no-wrap msgid "Another method get will be used by the slave to retrieve the orders. This method returns the order to be executed:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:41 #, no-wrap msgid "\tsynchronized order get()" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:44 #, no-wrap msgid "" "\t{\n" "\t\treturn m_order;\n" "\t}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:46 #, no-wrap msgid "A third method delete will be used by the slave to indicate that the order has been executed:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:48 #, no-wrap msgid "\tsynchronized void delete()" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:52 #, no-wrap msgid "" "\t{\n" "\t\tm_order.m_type = nan;\n" "\t}\n" "}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:54 #, no-wrap msgid "The main program of the slave contains an instance of the class exchange called list. We put () after the word list in order to create an instance of the class exchange." msgstr "" #. type: Plain text #: train702-help/tremote4.txt:56 #, no-wrap msgid "extern void object::Slave3( )" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:59 #, no-wrap msgid "" "{\n" "\texchange list();\n" "\torder todo;" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:61 #, no-wrap msgid "The outer while loop lasts for ever. The inner while loop waits for an order by using the get method of the exchange class. As soon as get returns a value different from nan, the while loop stops." msgstr "" #. type: Plain text #: train702-help/tremote4.txt:63 #, no-wrap msgid "\twhile ( true )" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:70 #, no-wrap msgid "" "\t{\n" "\t\twhile ( true )\n" "\t\t{\n" "\t\t\ttodo = list.get();\n" "\t\t\tif ( todo.m_type != nan ) break;\n" "\t\t\twait(1);\n" "\t\t}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:72 #, no-wrap msgid "Now we have received the order in the todo variable. All we have to do is execute it:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:74 #, no-wrap msgid "\t\tif ( todo.m_type == 1 )" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:85 #, no-wrap msgid "" "\t\t{\n" "\t\t\tmove(todo.m_param);\n" "\t\t}\n" "\t\telse if ( todo.m_type == 2 )\n" "\t\t{\n" "\t\t\tturn(todo.m_param);\n" "\t\t}\n" "\t\telse\n" "\t\t{\n" "\t\t\tmessage(\"Unknown order\");\n" "\t\t}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:87 #, no-wrap msgid "As soon as the execution of the order is finished, we must call the delete method so the master knows that another order can be sent¦:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:89 #, no-wrap msgid "\t\tlist.delete();" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:91 #, no-wrap msgid "" "\t}\n" "}" msgstr "" #. type: \b; header #: train702-help/tremote4.txt:92 #, no-wrap msgid "The master" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:94 #, no-wrap msgid "In the master we write an function called SendOrder which will send an order to the slave:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:96 #, no-wrap msgid "void object::SendOrder(float order, float param)" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:108 #, no-wrap msgid "" "{\n" "\texchange list();\n" "\torder todo();\n" "\t\n" "\ttodo.m_type = order;\n" "\ttodo.m_param = param;\n" "\t\n" "\twhile ( list.put(todo) == false )\n" "\t{\n" "\t\twait(1);\n" "\t}\n" "}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:111 #, no-wrap msgid "" "The while loop waits until a pending order has been terminated, that is the slaved has exited from the get method and the delete method has been called.\n" "Now the main program of the master is very simple:" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:113 #, no-wrap msgid "extern void object::Remote4( )" msgstr "" #. type: \s; block (usually verbatim code) #: train702-help/tremote4.txt:124 #, no-wrap msgid "" "{\n" "\tSendOrder(1, 20); // move(20);\n" "\tSendOrder(2, 90); // turn(90);\n" "\tSendOrder(1, 20); // move(20);\n" "\tSendOrder(2, 90); // turn(90);\n" "\tSendOrder(1, 10); // move(10);\n" "\tSendOrder(2, 90); // turn(90);\n" "\tSendOrder(1, 10); // move(10);\n" "\tSendOrder(2,-90); // turn(-90);\n" "\tSendOrder(1, 10); // move(10);\n" "}" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:126 #, no-wrap msgid "\\key;\\key help; show these instruction at any time." msgstr "" #. type: \t; header #: train702-help/tremote4.txt:128 #, no-wrap msgid "See also" msgstr "" #. type: Plain text #: train702-help/tremote4.txt:129 #, no-wrap msgid "Controls and programming." msgstr ""