CHIP8/DrawPixie.html at master · BobKuczewski/CHIP8 · GitHub

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<!DOCTYPE HTML>
<html>

<head>
<title>Draw/Edit Pixie Graphics</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<script>

// Default screen is 64 x 32 with a cell size of 15.
// Change to fit your screen or add autosizing code
var num_cols = 64;
var num_rows = 32;
var cell_size = 15;

var board;

// Default drawing in hex format (currently "COSMAC ELF COOL")
hex_text = "ff,ff,ff,ff,ff,ff,ff,ff,\n88,8b,a2,3f,ff,fe,0f,ff,\n" +
           "ba,b9,2a,ff,ff,9d,f3,ff,\nba,88,22,ff,ff,fb,7d,ff,\n" +
           "ba,ea,aa,ff,13,e7,be,ff,\n88,8b,aa,38,e0,1f,ff,7f,\n" +
           "ff,ff,ff,e7,c0,03,ff,7f,\nff,ff,ff,df,c1,c0,ff,bf,\n" +
           "82,78,3f,bf,c1,80,3f,bf,\n82,78,3f,7f,e3,83,87,bf,\n" +
           "9e,79,ff,7f,ff,83,f1,df,\n9e,79,fe,ff,ff,c7,fc,5f,\n" +
           "86,78,7e,ff,0f,ff,ff,0f,\n86,78,7e,fe,07,ff,ff,27,\n" +
           "9e,79,fd,fe,07,ff,fc,27,\n9e,79,fd,ff,0f,ff,d8,2f,\n" +
           "82,09,fd,ff,ff,ff,b0,2f,\n82,09,fe,ff,ff,ff,a0,2f,\n" +
           "ff,ff,fe,ff,ff,ff,60,2f,\nff,ff,ff,77,ff,df,40,6f,\n" +
           "c7,1c,67,b7,ff,ce,c0,5f,\n82,08,27,db,ff,be,80,df,\n" +
           "92,49,27,e3,ff,3d,80,bf,\n92,49,27,fc,30,fd,01,bf,\n" +
           "9e,49,27,ff,8f,f1,03,7f,\n9e,49,27,ff,f7,ee,86,ff,\n" +
           "9e,49,27,ff,fb,de,dd,ff,\n9e,49,27,ff,e0,3f,73,ff,\n" +
           "92,49,27,ff,df,df,8f,ff,\n82,08,20,ff,e0,3f,ff,ff,\n" +
           "c7,1c,60,ff,9f,7f,ff,ff,\nff,ff,ff,ff,3f,bf,ff,ff,\n";


function onload_code ( event ) {
  // Set the size of the canvas and generate the "board" array
  var da,r,c,row,hex_csv;
  da = document.getElementById("drawing_area");
  da.width  = num_cols * cell_size;
  da.height = num_rows * cell_size;
  board = [];
  for (r=0; r<num_rows; r++) {
    row = [];
		for (c=0; c<num_cols; c++) {
		  row.push(0);
		}
	  board.push(row);
  }
  hex_csv = document.getElementById("HexCSV");
  hex_csv.value = hex_text;
  update_from_hex();
  update_code();
}

var mouse_is_down = 0;
var current_color = 1;

function mouse_up ( event ) {
  mouse_is_down = 0;
  draw_canvas();
}

function mouse_down ( event ) {
  mouse_is_down = 1;
  var da = document.getElementById ( "drawing_area" );
  var mx = event.clientX - da.getBoundingClientRect().x;
  var my = event.clientY - da.getBoundingClientRect().y;
  mx = mx - 2; // Guessed this offset
  my = my - 2; // Guessed this offset
  var c = Math.floor(mx / cell_size);
  var r = Math.floor(my / cell_size);
  if (board[r][c] == 0) {
    current_color = 1;
  } else {
    current_color = 0;
  }
  board[r][c] = current_color;
  draw_canvas();
}

function mouse_movement ( event ) {
  if (mouse_is_down) {
		var da = document.getElementById ( "drawing_area" );
		var mx = event.clientX - da.getBoundingClientRect().x;
		var my = event.clientY - da.getBoundingClientRect().y;
		mx = mx - 2; // Guessed this offset
		my = my - 2; // Guessed this offset
		var c = Math.floor(mx / cell_size);
		var r = Math.floor(my / cell_size);
	  board[r][c] = current_color;
	  draw_canvas();
  }
}

function draw_canvas() {
  var drawing_area = document.getElementById ( "drawing_area" );
  var w = drawing_area.width;
  var h = drawing_area.height;
  var r,c;
  var ctxt = drawing_area.getContext("2d");
  // Fill background with black
  ctxt.fillStyle = "#000000";
  ctxt.fillRect(0,0,w,h);
  // Draw the data pixels
  for (r=0; r<num_rows; r++) {
    for (c=0; c<num_cols; c++) {
      if (board[r][c] == 0) {
			  ctxt.fillStyle = "#000000";
			} else {
			  ctxt.fillStyle = "#FFFFFF";
      }
      ctxt.fillRect(cell_size*c,cell_size*r,cell_size,cell_size);
    }
  }
  // Draw a grid
  ctxt.lineWidth = 1;
  ctxt.strokeStyle = "#888888";
  // Draw the vertical lines
  ctxt.beginPath();
  for (c=1; c<num_cols; c++) {
		ctxt.moveTo ( c*cell_size, 0 );
		ctxt.lineTo ( c*cell_size, h );
	}
  ctxt.stroke();
  // Draw the horizontal lines
  ctxt.beginPath();
  for (r=1; r<num_rows; r++) {
		ctxt.moveTo ( 0, r*cell_size );
		ctxt.lineTo ( w, r*cell_size );
	}
  ctxt.stroke();
}

function update_code() {
  // Update the binary text from the drawing board
  var csv_string = "";
  var r,c,v;
  for (r=0; r<board.length; r++) {
    for (c=0; c<board[r].length; c++) {
      csv_string += String(board[r][c]) + ",";
    }
    csv_string += "\n";
  }
  document.getElementById("BinaryCSV").value = csv_string;

  // Update the hex text from the drawing board
  csv_string = "";
  r = 0;
  while (r<board.length) {
    c = 0;
    v = 0;
    while (c<board[r].length) {
      v = (v<<1) | board[r][c];
      if ( ((c+1)%8) == 0 ) {
        csv_string += ("0"+v.toString(16)).slice(-2) + ",";
        v = 0;
      }
      c++;
    }
    csv_string += "\n";
    r++;
  }
  document.getElementById("HexCSV").value = csv_string;

  // Update the CHIP-8 Sprite blocks (8x8) from the drawing board
  num_rows = board.length;
  num_cols = board[0].length;
  chip8_string = "";
  for (ch8row=0; ch8row<num_rows/8; ch8row++) {    // Normally 8
    for (ch8col=0; ch8col<num_cols/8; ch8col++) {  // Normally 4
      console.log ( "Building block (" + ch8row + "," + ch8col + ")" );
      b = 0;
      for (sr=0; sr<8; sr++) {
        for (sc=0; sc<8; sc++) {
          b = (b << 1) | board[(8*ch8row)+sr][(8*ch8col)+sc];
        }
        if ((sr%2) != 0) {
          chip8_string += ("0000"+b.toString(16)).slice(-4) + "\n";
          b = 0;
        }
      }
      chip8_string += "\n";
    }
  }
  document.getElementById("Chip8Sprite").value = chip8_string;
}

function update_from_binary() {
  // Update the drawing board from the binary text
  var csv_rows = document.getElementById("BinaryCSV").value.trim().split('\n');
  board = [];
  for (r=0; r<csv_rows.length; r++) {
    var csv_row = csv_rows[r].split(',');
    row = [];
		for (c=0; c<csv_row.length; c++) {
		  if (csv_row[c].length > 0) {
		    row.push(Number(csv_row[c]));
		  }
		}
	  board.push(row);
	}
  draw_canvas();
}

function update_from_hex() {
  // Update the drawing board from the hex text
  var csv_rows = document.getElementById("HexCSV").value.trim().split('\n');
  var i, v;
  board = [];
  for (r=0; r<csv_rows.length; r++) {
    if (csv_rows[r].trim().length > 0) {
		  var csv_row = csv_rows[r].split(',');
		  row = [];
			for (c=0; c<csv_row.length; c++) {
				if (csv_row[c].trim().length > 0) {
					v = parseInt(csv_row[c],16);
					for (i=0; i<8; i++) {
					  row.push((v>>(7-i))&0x01);
					}
				}
			}
			board.push(row);
	  }
	}
  draw_canvas();
}

function clear_with ( value ) {
  board = [];
  for (r=0; r<num_rows; r++) {
    row = [];
		for (c=0; c<num_cols; c++) {
		  row.push(value);
		}
	  board.push(row);
	}
  draw_canvas();
}

function invert_image () {
  for (r=0; r<num_rows; r++) {
		for (c=0; c<num_cols; c++) {
		  board[r][c] = 1 - board[r][c];
		}
	}
  draw_canvas();
}

</script>
</head>

<body onload="onload_code();draw_canvas()" onresize="draw_canvas()" bgcolor="#D4E4FF">

<center>
<b>Draw/Edit Pixie Graphics</b>
<br/>
<canvas id="drawing_area" width="560" height="320"
        style="border:1px solid #000000;"
        oncontextmenu="return false;"
        onmousemove="mouse_movement(event)"
        onmousedown="mouse_down(event)"
        onmouseup="mouse_up(event)">
  Your browser does not support the HTML5 canvas tag.
</canvas>
<hr/>
<input type="button" name="update_code" value="&#9660; Update Code from Drawing &#9660;" onclick="update_code()"></input> &nbsp;
<input type="button" name="update_from_binary" value="&#9650; Update Drawing from Binary &#9650;" onclick="update_from_binary()"></input> &nbsp;
<input type="button" name="update_from_hex" value="&#9650; Update Drawing from Hex &#9650;" onclick="update_from_hex()"></input> &nbsp;
<hr/>
Binary CSV representation of Drawing<br/>
<textarea id="BinaryCSV" rows="8" cols="130">
</textarea>
<hr/>
Hex CSV representation of Drawing<br/>
<textarea id="HexCSV" rows="8" cols="130">
</textarea>
<hr/>
Hex CHIP-8 Sprite representation of Drawing<br/>
<textarea id="Chip8Sprite" rows="8" cols="130">
</textarea>

<hr/>
<input type="button" name="clear_white" value="Clear with White" onclick="clear_with(1)"></input> &nbsp;
<input type="button" name="invert" value="Invert" onclick="invert_image()"></input> &nbsp;
<input type="button" name="clear_black" value="Clear with Black" onclick="clear_with(0)"></input> &nbsp;
<hr/>

</center>

</body>
</html>