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15.html
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<html>
<!--
When a letter of alphabet is typed on the keyboard, the letter appears
next to the active cell in the grid. The drawn letter is updated when a new
key is pressed.
-->
<head>
<script src='processing-1.4.1.js'></script>
<style>
canvas {
outline: none;
}
/* So that when we click, the canvas isn't outlined */
</style>
</head>
<body>
<canvas></canvas>
</body>
<script>
/* @pjs font="Arial.ttf"; */
var canvas = document.getElementsByTagName('canvas')[0];
function sketch(p) {
var x, y;
var gridSize;
var gridColor;
var activeCol;
var activeRow;
var pactiveCol;
var pactiveRow;
var gridW;
var gridH;
var txt;
function setup() {
p.size(400, 300);
p.ellipseMode(p.CENTER);
p.rectMode(p.CENTER);
p.println("width: " + p.width + ", height: " + p.height);
x = p.width / 2;
y = p.height / 2;
gridSize = 25;
gridColor = p.color(0x0000FF, 80);
p.textFont(p.createFont("Arial", 32));
//p.noLoop();
}
function draw() {
p.fill(0, 15);
p.rect(p.width / 2, p.height / 2, p.width, p.height);
grid(gridSize, gridColor, activeRow, activeCol);
trace(activeCol * gridSize, activeRow * gridSize, pactiveCol * gridSize, pactiveRow * gridSize);
txtW = p.textWidth(txt);
p.fill(255);
p.text(txt, ((activeCol - 0.5) * gridSize), ((activeRow - 0.5) * gridSize));
//p.println(p.__frameRate);
}
p.mousePressed = function() {
p.mouseDragged();
gridColor = p.color(p.random(255), p.random(255), p.random(255), 128);
}
p.mouseReleased = function() {
p.mouseMoved();
}
p.mouseMoved = function() {
pactiveCol = activeCol;
pactiveRow = activeRow;
activeCol = p.floor(p.mouseX / gridSize) + 0.5;
activeRow = p.floor(p.mouseY / gridSize) + 0.5;
}
p.mouseDragged = function() {
pactiveCol = activeCol;
pactiveRow = activeRow;
activeCol = gridW - p.floor(p.mouseX / gridSize) - 0.5;
activeRow = gridH - p.floor(p.mouseY / gridSize) - 0.5;
}
p.keyPressed = function() {
pactiveCol = activeCol;
pactiveRow = activeRow;
switch (p.keyCode) {
case 37:
activeCol -= 1;
if (activeCol < 0.5) activeCol = 0.5;
break;
case 39:
activeCol += 1;
if (activeCol > gridW - 0.5) activeCol = gridW - 0.5;
break;
case 38:
activeRow -= 1;
if (activeRow < 0.5) activeRow = 0.5;
break;
case 40:
activeRow += 1;
if (activeRow > gridH - 0.5) activeRow = gridH - 0.5;
break;
default:
if ((p.keyCode > 64) && (p.keyCode < 123)) {
txt = String.fromCharCode(p.keyCode);
}
break;
}
}
function grid(gridSize, gridColor, activeRow, activeCol) {
gridW = p.width / gridSize;
gridH = p.height / gridSize;
for (var row = 0.5; row < gridH; row++) {
for (var col = 0.5; col < gridW; col++) {
var dotSize;
if (typeof(activeCol) == 'undefined' || typeof(activeRow) == 'undefined') {
dotSize = gridSize * 0.9;
} else {
dotSize = gridSize * p.dist(row, col, activeRow, activeCol) / p.max(gridW, gridH);
}
p.noStroke();
p.fill(0, 64);
p.rect(col * gridSize, row * gridSize, gridSize, gridSize);
p.fill(gridColor);
p.ellipse(col * gridSize, row * gridSize, dotSize, dotSize);
}
}
}
function trace(x1, y1, x2, y2) {
p.fill(255);
p.stroke(255);
p.ellipse(x1, y1, 10, 10);
p.line(x1, y1, x2, y2);
p.ellipse(x2, y2, 10, 10);
}
p.setup = setup;
p.draw = draw;
}
var p = new Processing(canvas, sketch); // actually attach and run the sketch
</script>
</html>