Activities/Turtle Art/Uso de Tortuga Arte Sensores: Difference between revisions

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 Como en el Turtle Art V106 no es una construida en la muestra <i>psuedo-color.ta</i> que sólo difiere en que se carga la imagen de la revista en lugar de la cámara.
+===Create your own 'camera' block with Python code===
+As of TurtleBlocksV106, this section has been largely superceded. The Show Camera block [[File:Show camera.jpg]] now has the function of the Python code and Show Media blocks [[File:Python show media.jpg]]. This information has been retained just to show how a little Python coding can be used to create your own 'show camera'.
+[[File:Captureta camera.jpg]]
+Load the following code into the Python block [[File:Pythoncodeblock.jpg|40px]]
+ def myblock(lc, x):
+    import gst, time
+ # grab a frame from camera to file
+    pipeline = gst.parse_launch('v4l2src ! ffmpegcolorspace ! jpegenc ! filesink location=/tmp/turtlepic.jpg')
+    pipeline.set_state(gst.STATE_PLAYING)
+ # pause for a second to allow the camera frame to be grabbed
+    time.sleep(1)
+ # stop the camera frame grabbing
+    pipeline.set_state(gst.STATE_NULL)
+This saves a photo to /tmp/turtlepic.jpg
+Here is the Turtle Art program as a doc file [[File:Camera ta.doc]].  The Show Media block is coded to point to the file /tmp/turtlepic.jpg
+  ["journal", "/tmp/turtlepic.jpg"]
+There are two ways to make the show media tile point to the file system and not the Journal
+hand edit the code in the *.ta file with the Write Activity
+Run Turtle Art under Gnome which has a file choser rather than a Journal object choser, the settings in the block are retained if the saved project is later run under Sugar
 ==Enlaces==