Difference between revisions of "Turtle bot"

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Line 8: Line 8:
 
}
 
}
 
</style>
 
</style>
Show recording: <input type="checkbox" id="show_record"><br/>
+
Show recording: <input type="checkbox" id="show_record">Show grid: <input type="checkbox" id="show_grid"><br/>
 
<button id="btn_record">record</button>
 
<button id="btn_record">record</button>
 
<button id="btn_play">play</button>
 
<button id="btn_play">play</button>
Line 55: Line 55:
 
});
 
});
  
 +
// Global variables:
 
var turtle = board.create('turtle', [0,0]);
 
var turtle = board.create('turtle', [0,0]);
 
var is_recording = false;
 
var is_recording = false;
Line 62: Line 63:
 
var stepsize = 100;
 
var stepsize = 100;
  
 +
// Event handlers:
 
document.getElementById("btn_forward").addEventListener("click", function(evt) {
 
document.getElementById("btn_forward").addEventListener("click", function(evt) {
if (is_recording) {
+
  if (is_recording) {
program.push('turtle.forward(stepsize);');
+
    program.push('turtle.forward(stepsize);');
    if (document.getElementById("show_record").checked) { turtle.forward(100); }
+
    if (document.getElementById("show_record").checked) { turtle.forward(100); }
    } else {
+
  } else {
    turtle.forward(stepsize);
+
    turtle.forward(stepsize);
    }
+
  }
   
 
 
});  
 
});  
 +
 
document.getElementById("btn_back").addEventListener("click", function(evt) {
 
document.getElementById("btn_back").addEventListener("click", function(evt) {
if (is_recording) {
+
  if (is_recording) {
program.push('turtle.back(stepsize);');
+
    program.push('turtle.back(stepsize);');
    if (document.getElementById("show_record").checked) { turtle.back(100); }
+
    if (document.getElementById("show_record").checked) { turtle.back(100); }
    } else {
+
  } else {
    turtle.back(stepsize);
+
    turtle.back(stepsize);
    }
+
  }
 
});  
 
});  
 +
 
document.getElementById("btn_left").addEventListener("click", function(evt) {
 
document.getElementById("btn_left").addEventListener("click", function(evt) {
if (is_recording) {
+
  if (is_recording) {
program.push('turtle.left(angle);');
+
    program.push('turtle.left(angle);');
    if (document.getElementById("show_record").checked) { turtle.left(45); }
+
    if (document.getElementById("show_record").checked) { turtle.left(45); }
    } else {
+
  } else {
    turtle.left(angle);
+
    turtle.left(angle);
    }
+
  }
 
});  
 
});  
 +
 
document.getElementById("btn_right").addEventListener("click", function(evt) {
 
document.getElementById("btn_right").addEventListener("click", function(evt) {
if (is_recording) {
+
  if (is_recording) {
program.push('turtle.right(angle);');
+
    program.push('turtle.right(angle);');
    if (document.getElementById("show_record").checked) { turtle.right(45); }
+
    if (document.getElementById("show_record").checked) { turtle.right(45); }
    } else {
+
  } else {
    turtle.right(angle);
+
    turtle.right(angle);
    }
+
  }
 
});  
 
});  
 +
 
document.getElementById("btn_clear").addEventListener("click", function(evt) {
 
document.getElementById("btn_clear").addEventListener("click", function(evt) {
turtle.clearScreen();
+
  turtle.clearScreen();
 
});  
 
});  
  
 
document.getElementById("btn_record").addEventListener("click", function(evt) {
 
document.getElementById("btn_record").addEventListener("click", function(evt) {
if (!is_recording) {
+
  if (!is_recording) {
is_recording = true;
+
    is_recording = true;
 
     document.getElementById("btn_record").innerHTML = "stop";
 
     document.getElementById("btn_record").innerHTML = "stop";
 
     document.getElementById("btn_record").classList.add('record');  
 
     document.getElementById("btn_record").classList.add('record');  
Line 109: Line 114:
 
     turtle.clearScreen();
 
     turtle.clearScreen();
 
   } else {
 
   } else {
is_recording = false;
+
    is_recording = false;
 
     document.getElementById("btn_record").innerHTML = "record";
 
     document.getElementById("btn_record").innerHTML = "record";
 
     document.getElementById("btn_record").classList.remove('record');  
 
     document.getElementById("btn_record").classList.remove('record');  
Line 119: Line 124:
  
 
var do_step = function() {
 
var do_step = function() {
if (step < program.length) {
+
  if (step < program.length) {
  eval(program[step]);
+
    eval(program[step]);
 
     step++;
 
     step++;
 
     setTimeout(do_step, 500);
 
     setTimeout(do_step, 500);
Line 126: Line 131:
 
}
 
}
 
document.getElementById("btn_play").addEventListener("click", function(evt) {
 
document.getElementById("btn_play").addEventListener("click", function(evt) {
    step = 0;
+
  step = 0;
//eval(program);
+
  do_step();     
  do_step();     
 
 
});  
 
});  
 
 
</jsxgraph>
 
</jsxgraph>
  

Revision as of 11:32, 13 June 2019

Show recording: Show grid:

The underlying JavaScript code

HTML code:

<style>
button {
  min-width:100px;
}
.record {
  background-color: #ffaaaa;
}
</style>
Show recording: <input type="checkbox" id="show_record"><br/>
<button id="btn_record">record</button>
<button id="btn_play">play</button>
<button id="btn_clear">clear screen</button>

<table>
<tr>
  <td></td>
  <td><button id="btn_forward">forward</button></td>
  <td></td>
</tr>
<tr>
  <td><button id="btn_left">left</button></td>
  <td></td>
  <td><button id="btn_right">right</button></td>
</tr>
<tr>
  <td></td>
  <td><button id="btn_back">back</button></td>
  <td></td></tr>
</table>

JavaScript code:

const board = JXG.JSXGraph.initBoard('turtlebox', { 
  boundingbox: [-500, 500, 500, -500], 
  axis:true,
  defaultAxes: {
    x: {
      visible:false,
      ticks: {
        label: {
          visible: false
        }
      }
    }, 
    y: {
      visible:false,
      ticks: {
        label: {
          visible: false
        }
      }
    } 
  }
});

// Global variables:
var turtle = board.create('turtle', [0,0]);
var is_recording = false;
var program = [];
var step;
var angle = 90;
var stepsize = 100;

// Event handlers:
document.getElementById("btn_forward").addEventListener("click", function(evt) {
  if (is_recording) {
    program.push('turtle.forward(stepsize);');
    if (document.getElementById("show_record").checked) { turtle.forward(100); }
  } else {
    turtle.forward(stepsize);
  }  
}); 

document.getElementById("btn_back").addEventListener("click", function(evt) {
  if (is_recording) {
    program.push('turtle.back(stepsize);');
    if (document.getElementById("show_record").checked) { turtle.back(100); }
  } else {
    turtle.back(stepsize);
  }
}); 

document.getElementById("btn_left").addEventListener("click", function(evt) {
  if (is_recording) {
    program.push('turtle.left(angle);');
    if (document.getElementById("show_record").checked) { turtle.left(45); }
  } else {
    turtle.left(angle);
  }
}); 

document.getElementById("btn_right").addEventListener("click", function(evt) {
  if (is_recording) {
    program.push('turtle.right(angle);');
    if (document.getElementById("show_record").checked) { turtle.right(45); }
  } else {
    turtle.right(angle);
  }
}); 

document.getElementById("btn_clear").addEventListener("click", function(evt) {
  turtle.clearScreen();
}); 

document.getElementById("btn_record").addEventListener("click", function(evt) {
  if (!is_recording) {
    is_recording = true;
    document.getElementById("btn_record").innerHTML = "stop";
    document.getElementById("btn_record").classList.add('record'); 
    program = [];
    board.defaultAxes.x.setAttribute({visible:true});
    board.defaultAxes.y.setAttribute({visible:true});
    turtle.clearScreen();
  } else {
    is_recording = false;
    document.getElementById("btn_record").innerHTML = "record";
    document.getElementById("btn_record").classList.remove('record'); 
    board.defaultAxes.x.setAttribute({visible:false});
    board.defaultAxes.y.setAttribute({visible:false});
    turtle.clearScreen();
  }
}); 

var do_step = function() {
  if (step < program.length) {
    eval(program[step]);
    step++;
    setTimeout(do_step, 500);
  }
}
document.getElementById("btn_play").addEventListener("click", function(evt) {
  step = 0;
  do_step();    
});