-
Introduction
- -This tutorial a complete walk though for adding a block to the turtle app.-By the end of the tutorial you will have a fully functional new block in the turtle tool box.
-This new block, called move to will move the turtle directly to a specified x/y location.
-
-
-
Before you begin
- -The basic tools you need for this tutorial are:-
-
- Subversion
- A simple text editor (also an IDE for Javascript code editor would be good)
- The Blockly source code
- A browser
-
Installing Subversion
--For Linux its a simple matter of running this in a terminal window:
-
> sudo apt-get install subversion
-Install the Blockly source code
--To get the latest verison of Blockly run the following from a terminal window:
-
> svn checkout http://blockly.googlecode.com/svn/trunk/ blockly
--Since this tutorial modifies the turtle app files you might want to copy the folder and contents for backup purposes.
-The folder in question is called "turtle" and exists in the "blockly/apps/" folder.
-
-
-
Pre-checks
- -Open the Blockly/apps/turtle folder. Test the turtle app by double-clicking the index.html file.-Make sure it runs in the browser.
-
-The files which are going to be modified are turtle.js, blocks.js, and template.soy within the folder.
-
-
-
-
Step 1 - Designing the block
- -Let's start by designing the block itself. Open the online block designer. This designer helps to define how the new block will look and function.-
-Open this link: https://blockly-demo.appspot.com/static/apps/blockfactory/index.html - -Design the block as per this layout:
-
-
-
-The preview block should look like this:-
-
-
-Once complete you can see two sets of generated code in the tables to the right.-
-
Blockly Language Code
-Blockly.Blocks['move_to'] = {
- init: function() {
- this.setHelpUrl('http://www.example.com/');
- this.setColour(160);
- this.appendDummyInput()
- .appendField("move to");
- this.appendValueInput("XPOS")
- .setCheck("Number")
- .appendField("x");
- this.appendValueInput("YPOS")
- .setCheck("Number")
- .appendField("y");
- this.setInputsInline(true);
- this.setPreviousStatement(true);
- this.setNextStatement(true);
- this.setTooltip('');
-}
-Blockly JavaScript stub code
-Blockly.JavaScript['move_to'] = function(block) {
- var value_xpos = Blockly.JavaScript.valueToCode(block, 'XPOS', Blockly.JavaScript.ORDER_ATOMIC);
- var value_ypos = Blockly.JavaScript.valueToCode(block, 'YPOS', Blockly.JavaScript.ORDER_ATOMIC);
- // TODO: Assemble JavaScript into code variable.
- var code = '...';
- return code;
-};
--https://code.google.com/p/blockly/wiki/DefiningBlocks - -For more details on the code generation see:
-https://code.google.com/p/blockly/wiki/GeneratingCode - -
-
Step 2 - Editing the blocks.js file
- - -Open blocks.js via a standard text editor or IDE.-
-Taking the above two blocks of code, paste both parts in after this section of code.
-
-
Blockly.JavaScript['draw_move'] = function(block) {
- ...
-};
--
-
Blockly.Blocks['draw_moveto'] = {
- // move turtle to absolute x,y location
- // for reference 0,0 is top/let and 200,200 is centre
- init: function() {
- this.setHelpUrl('');
- this.setColour(160);
- this.appendDummyInput()
- .appendField(BlocklyApps.getMsg('Turtle_moveTo'));
- this.appendValueInput("XPOS")
- .setCheck("Number")
- .appendField("x");
- this.appendValueInput("YPOS")
- .setCheck("Number")
- .appendField("y");
- this.setInputsInline(true);
- this.setPreviousStatement(true);
- this.setNextStatement(true);
- this.setTooltip(BlocklyApps.getMsg('Turtle_moveToTooltip'));
- }
-};
-
-Blockly.JavaScript['draw_moveto'] = function(block) {
- // Generate JavaScript for moving to absolute position
- var xpos = Blockly.JavaScript.valueToCode(block, 'XPOS', Blockly.JavaScript.ORDER_NONE) || '0';
- var ypos = Blockly.JavaScript.valueToCode(block, 'YPOS', Blockly.JavaScript.ORDER_NONE) || '0';
- return 'Turtle.moveTo(' + xpos + ',' + ypos + ', \'block_id_' + block.id + '\');\n';
-};
--
-
-
-
Step 3 - Editing the turtle.js file
- -Open turtle.js via a standard text editor or IDE.-
-Look for the Turtle API section. It comes under the // Turtle API comment.
-
-Add the following API block of code after the Turtle.moveBackward{} API block.
-
Turtle.moveTo = function(xpos, ypos, id) {
- BlocklyApps.log.push(['MT', xpos, ypos, id]);
- };
--Drop this piece of code inside the switch (command) {...} block of the Turtle.step function.
-A sensible place is between the 'FD' (Forward) and 'RT' (Right Turn) sections:
-
case 'MT': // Move To
- Turtle.x=values[0];
- Turtle.y=values[1];
- break;
--
-
-
-
Step 4 - Editing the template.soy file
- -Open the template.soy file for editing.-
-Within the {template .messages} block open up some space and paste in the following.
-This is helper/documentation for the move_to block.
-A recommended location is after the
<span id="Turtle_moveBackward"> ... ></span> part in the document.-
<span id="Turtle_moveToTooltip">{msg meaning="Turtle.moveToTooltip" desc="Moves the turtle to an absolute x and y location via 2 numbers. Top left is 0,0 whilst centre is 200,200 (default)."}Moves turtle to the absolute x/y location without drawing a mark{/msg}</span>
- <span id="Turtle_moveTo">{msg meaning="Turtle.moveTo" desc="block text - Infinitive or imperative of a verb to move the turtle to an absolute x and y location via 2 numbers. Top left is 0,0 whilst centre is 200,200 (default)."}move to{/msg}</span>
-{template .toolbox} section and insert the following. A logical place for the "move to" block to appear in the tool box is after existing the "draw move" block. Therefore, paste this section after - -...
-
-Unknown end tag for
-
-
<block type="draw_moveto">
- <value name="XPOS">
- <block type="math_number">
- <field name="NUM">200</field>
- </block>
- </value>
- <value name="YPOS">
- <block type="math_number">
- <field name="NUM">200</field>
- </block>
- </value>
- </block>
--
-
-
-
Step 5 - Compling the code changes
- -Before continuing ensure all changes to the turtle.js, blocks.js, and template.soy files have been saved.-
-Now that the code has been entered it's time to compile the changes.
-Open up a terminal window and navigate into the turtle folder. For example:
-
> cd <myfolder>/blockly/apps/turtle
--
java -jar ../_soy/SoyToJsSrcCompiler.jar --outputPathFormat generated/en.js --srcs ../common.soy,template.soy
--
-
-
-
Step 6 - Testing the new block
- -From the turtles folder double-click index.html. This should launch the turtle blockly program in your browser.-Open the toolbox and check to see if the new ''move to'' block is present.
-Hovering over the new block should reveal the help text popup balloon.
-
-Constuct a simple test block and run the code. Example:
-
-
-
-You can check that the code is being correctly to generated by pressing the code button:-
-
-
-The generated code should look like this:-
var x_position;
-
-Turtle.turnRight(30);
-for (x_position = 100; x_position <= 300; x_position += 15) {
- Turtle.moveTo(x_position,220);
- Turtle.moveForward(50);
-}
-- -
END OF TUTORIAL
- -That's your first block under way. If you want to modify the blocks functionality/appearance then its just a matter of changing the code and re-compiling (as per Step 5).-
-Note that you can leave the browser open but you will need to refresh the page in order to see new changes take place.
-
-(TODO: Link to Google+ page.)
-
-Please send any questions you have to the support group, not as a comment to this page. \ No newline at end of file diff --git a/UnitTesting.md b/UnitTesting.md deleted file mode 100644 index 9dead82..0000000 --- a/UnitTesting.md +++ /dev/null @@ -1,18 +0,0 @@ -After changing or adding code, you should run existing unit tests and consider writing more. - -# Running unit tests - 1. Load ` tests/generators/index.html ` in a browser. - 1. Choose the relevant part of the system to test from the drop-down menu, and click "Load". Blocks should appear in the workspace. - 1. Click on "JavaScript". - 1. Copy and run the generated code in a JavaScript console. If the output ends with "OK", the test has passed. - 1. Click on "Python". - 1. Copy and run the generated code in a Python interpreter. If the output ends with "OK", the test has passed. - 1. Click on "Dart". - 1. Copy and run the generated code in a Dart interpreter. If the output ends with "OK", the test has passed. - -# Modifying or creating unit tests - 1. Load ` tests/generators/index.html ` in a browser. - 1. Choose the relevant part of the system from the drop-down menu, and click "Load". Blocks should appear in the workspace. - 1. Make any changes or additions to the blocks. - 1. Click on "XML". - 1. Copy the generated XML into the appropriate file in ` tests/generators/ `. \ No newline at end of file diff --git a/help/Variables.md b/Variables.md similarity index 95% rename from help/Variables.md rename to Variables.md index 549d758..266d74e 100644 --- a/help/Variables.md +++ b/Variables.md @@ -16,7 +16,7 @@ While users can choose any name for a variable, core Blockly provides a default Clicking on a variable's dropdown symbol (triangle) gives the following menu: - + The menu provides the following options. * the names of all variables defined in the program. @@ -29,13 +29,13 @@ The menu provides the following options. The **set** block assigns a value to a variable, creating the variable if it doesn't already exist. For example, this sets the value of the variable named "age" to 12. - + ## Get The **get** block provides the value stored in a variable, without changing it. - + It is possible, but a bad idea, to write a program in which a **get** appears without a corresponding **set**. @@ -43,6 +43,6 @@ It is possible, but a bad idea, to write a program in which a **get** appears wi Consider the following example code: - + The first row of blocks creates a variable named "age" and sets its initial value to the number 12. The second row of blocks gets the value 12, adds 1 to it, and stores the sum (13) into the variable. The final row displays the message: "Happy birthday! 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