Activities/Turtle Art-0.86: Difference between revisions

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   [[0,"repeat",331,158,[null,1,2,null]],[1,["number","4"],417,167,[0,null]],[2,"forward",426,207,[0,3,4]],[3,["number","100"],500,216,[2,null]],[4,"right",426,246,[2,5,null]],[5,["number","90"],500,255,[4,null]],[-1,"turtle",0,0,0,0,50,5]]
-==From the field==
+==Programmable Brick==
+The following feature is only available in the [[Activity/TAPortfolio|experimental fork]] of Turtle Art.
+=== myblock.py ===
+And a block that can be programmed by the Pippy interface:
+A copy of the tamyblock.py module is stored in the Journal when you first launch TurtleArt. You can edit the module in Pippy and then import your custom code into Turtle Art using the Pippy button.
+[[Image:TAPippyButton.svg]]
+[[Image:TA-pippy.png|300px]]
+To use the customized block, select the "view source" block from the Sensors palette.
+[[Image:TAMyblock.svg]]
+Examples:
+ from taturtle import *
+ def myblock(lc,x):
+ # draw a dotted line of length x
+    # make sure x is a number
+    if type(x) != int and type(x) != float:
+        return
+    dist = 0
+    # save current turtle pen state
+    pen = lc.tw.turtle.pendown
+    # repeat drawing dots
+    while dist+lc.tw.turtle.pensize < x:
+        setpen(lc.tw.turtle, True)
+        forward(lc.tw.turtle, 1)
+        setpen(lc.tw.turtle, False)
+        forward(lc.tw.turtle, (lc.tw.turtle.pensize*2)-1)
+        dist += (lc.tw.turtle.pensize*2)
+    # make sure we have moved exactly x
+    forward(lc.tw.turtle, x-dist)
+    # restore pen state
+    setpen(lc.tw.turtle, pen)
+ return
+[[Image:TA-dotted-line.png]]
+ from taturtle import *
+ def myblock(lc,x):
+ # push an uppercase version of a string onto the heap
+    if type(x) != str:
+        X = str(x).upper()
+    else:
+        X = x.upper()
+    # push result onto heap (use the pop block to use the new string)
+    lc.heap.append(X)
+ return
+ from taturtle import *
+ def myblock(lc,x):
+ # push hours, minutes, seconds onto the heap
+ # use three pop blocks to retrieve the values
+ # remember: the heap is a FILO (first in, last out)
+ # the first value you will pop will be seconds
+    lc.heap.append(localtime().tm_hour)
+    lc.heap.append(localtime().tm_min)
+    lc.heap.append(localtime().tm_sec)
+ return
+ from taturtle import *
+ def myblock(lc,x):
+ # add a third dimension (gray) to the color model
+    # calculate the value (brightness) of the current color
+    val = 0.3 * lc.tw.rgb[0] + 0.6 * lc.tw.rgb[1] + 0.1 * lc.tw.rgb[2]
+    # make sure gray is in range from 0 to 100
+    if x != 100:
+        x = int(x)%100
+    # mix in gray
+    r = int((val*(100-x) + lc.tw.rgb[0]*x)/100)
+    g = int((val*(100-x) + lc.tw.rgb[1]*x)/100)
+    b = int((val*(100-x) + lc.tw.rgb[2]*x)/100)
+    # reallocate current color
+    lc.tw.fgcolor = lc.tw.cm.alloc_color(r<<8,g<<8,b<<8)
+ return
+===From the field===
 Tony Forster has written a number of blog posts about his experiments with Turtle Art: [http://tonyforster.blogspot.com/2009/02/using-python-blocks-in-turtleart.html Using Python blocks in TurtleArt] [http://tonyforster.blogspot.com/2009/02/turtle-lander.html Turtle Lander] [http://tonyforster.blogspot.com/2009/01/reprogramming-sugar.html Reprogramming Sugar]
 [[Category:Activity]]