Added drawing examples

More examples

Author: RobotJavaScript

Display/Draw a circle.js

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+circle( 85, 60, 40 )
+sleep(2000)

Display/Draw a rectangle.js

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+rect( 15, 30, 140, 50 )
+sleep(2000)

Display/Draw filled circles.js

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+for(i=25; i<120; i+=30) {
+  fillCircle( i,  50, 15 )
+  sleep(500)
+}
+sleep(5000)

Display/Draw filled rectangles.js

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+for(i=25; i<120; i+=30) {
+  fillRect( i,  20, 15, 80 )
+  sleep(500)
+}
+sleep(5000)

Display/Draw lines from a point.js

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+while(true) {
+  line( 85, 60, random() * 180, random() * 120 )
+  sleep(500)
+}

Display/Draw many circles.js

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+while(true) {
+  circle( random() * 180, random() * 120, random() * 40 )
+  sleep(500)
+}

Display/Draw many rectangles.js

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+while(true) {
+  rect( random() * 180, random() * 120, random() * 40, random() * 40 )
+  sleep(500)
+}

Display/Draw random lines.js

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+while(true) {
+  line( random() * 180, random() * 120, random() * 180, random() * 120 )
+  sleep(500)
+}

Display/Etch A Sketch.js

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+// Etch A Sketch 
+// Attach two medium motors to ports A and D
+// Attach a wheel to each motor to use as the knobs of the Etch A Sketch
+// This program uses the motor encoders to position a cursor on the LCD screen
+// Attach a touch sensor to clear the screen
+resetEncoder(A)
+resetEncoder(D)
+clearScreen()
+center = { x: 89, y: 64 }                // Create a 'center point'
+cursor = { x: 0, y: 0 }                  // Initialize a cursor object
+scaling = 0.7                            // Scaling can control how many degrees of rotation are needed to move the cursor
+while(true) {                            // Loop forever
+  cursor.y = encoderValue(A) * scaling   // Calculate a value for cursor.y (Encoder times scaling)
+  cursor.x = encoderValue(D) * scaling   // Calculate a value for cursor.x (Encoder times scaling)
+  // Check the cursor values to see if they have exceeded the bounds of the LCD display
+  // The encoderValues will return degrees of rotation (positive and negative) which 
+  // are used as an offset to the center point.  If the encoder is less than zero, then 
+  // the cursor will be moved to the left or upwards on the LCD display.  If the encoder
+  // is greater than zero, then the cursor will be moved to the right or downwards.
+  
+  if(cursor.y > center.y) cursor.y = center.y - 1            // If the value of the cursor.y is greater than the center.y, then center.y+cursor.y would be greater than the maximum y value for the LCD display.  In this case, set the cursor.y to center.y minus 1.
+  if(cursor.y < -1 * center.y) cursor.y = center.y * -1 + 1  // If the value of the cursor.y is less than the -1*center.y, then center.y+cursor.y would be less than zero. In this case, set the cursor.y to center.y*-1 plus 1.
+  if(cursor.x > center.x) cursor.x = center.x - 1            // If the value of the cursor.x is greater than the center.x, then center.x+cursor.x would be greater than the maximum x value for the LCD display.  In this case, set the cursor.x to center.x minus 1.
+  if(cursor.x < -1 * center.x) cursor.x = center.x * -1 + 1  // If the value of the cursor.x is less than the -1*center.x, then center.x+cursor.x would be less than zero. In this case, set the cursor.x to center.x*-1 plus 1.
+  fillCircle( center.x+cursor.x, center.y+cursor.y, 2)       // Good coordinates here.  Draw a circle with radius 2
+  if(touchSensorPressed()) clearScreen()                     // If the touch sensor is pressed, clear the screen
+  sleep(10)
+}
+
+