remove sandbox/

1 files changed, 192 insertions, 0 deletions

diff --git a/bounds4/demo.js b/bounds4/demo.js
new file mode 100644
index 0000000..cf87093
--- /dev/null
+++ b/bounds4/demo.js
@@ -0,0 +1,192 @@
+/*global Slider: false, rAF: false, quadLimit: false */
+
+// -------------------------- demo  -------------------------- //
+
+var canvas, ctx;
+var canvasW, canvasH;
+var slider;
+var cells = [];
+var leftBound, rightBound;
+var cellWidths = [ 0.2, 0.2, 0.4, 0.2, 0.3 ];
+
+document.addEventListener( 'DOMContentLoaded', init, false );
+
+function init() {
+  canvas = document.querySelector('canvas');
+  ctx = canvas.getContext('2d');
+  // set size
+  canvasW = canvas.width = window.innerWidth - 20;
+  canvasH = canvas.height = 300;
+
+  // create cells
+  var cellX = 0;
+  var gutter = 40;
+  for ( var i=0, len = cellWidths.length; i < len; i++ ) {
+    var cellWidth = cellWidths[i];
+    var cell = {
+      width: canvasW * cellWidth,
+      height: canvasH - 40,
+      x: cellX,
+      index: i
+    };
+    cellX += cell.width + gutter;
+    cells.push( cell );
+  }
+
+  leftBound = 100;
+  rightBound = canvasW - 100;
+
+  canvas.addEventListener( 'mousedown', onMousedown, false );
+
+  slider = new Slider( leftBound, 0 );
+  slider.width = cellX - gutter;
+
+  animate();
+}
+
+// -------------------------- animate -------------------------- //
+
+function animate() {
+  if ( !isDragging ) {
+    applyLeftBoundForce();
+    applyRightBoundForce();
+  }
+
+  slider.update();
+
+  render();
+  rAF( animate );
+}
+
+function applyLeftBoundForce() {
+  var sliderX = slider.x;
+
+  var distance = leftBound - sliderX;
+  var force = distance * 0.05;
+  force = Math.min( force, 0 );
+  // prevent slider from bounds too far back
+  // don't apply force if slider is returning from outside bounds
+  if ( force && slider.velocity < 0 ) {
+    // resting position
+    var restPosition = slider.getRestingPosition();
+    if ( restPosition.x < leftBound ) {
+      force = ( leftBound - slider.x ) / restPosition.frictionSum - slider.velocity;
+    }
+  }
+  slider.applyForce( force );
+}
+
+function applyRightBoundForce() {
+  var sliderX = slider.x + slider.width;
+
+  var distance = rightBound - sliderX;
+  var force = distance * 0.05;
+  force = Math.max( force, 0 );
+  // prevent slider from bounds too far back
+  // don't apply force if slider is returning from outside bounds
+  if ( force && slider.velocity > 0 ) {
+    // resting position
+    var restPosition = slider.getRestingPosition();
+    if ( restPosition.x + slider.width > rightBound ) {
+      force = ( rightBound - sliderX ) / restPosition.frictionSum - slider.velocity;
+    }
+  }
+  slider.applyForce( force );
+}
+
+// -------------------------- render -------------------------- //
+
+function render() {
+  ctx.clearRect( 0, 0, canvasW, canvasH );
+
+  // bounds
+  ctx.lineWidth = 1;
+  ctx.strokeStyle = 'hsla(300, 100%, 40%, 1)';
+  line( leftBound, 0, leftBound, canvasH );
+  line( rightBound, 0, rightBound, canvasH );
+
+  // cells
+  ctx.save();
+  ctx.translate( slider.x, 0 );
+  for ( var i=0, len = cells.length; i < len; i++ ) {
+    var cell = cells[i];
+    var hue = i * 70;
+    ctx.fillStyle = 'hsla(' + hue + ', 100%, 40%, 0.5)';
+    ctx.fillRect( cell.x, 20, cell.width, cell.height );
+    // target line
+    ctx.strokeStyle  = 'yellow';
+    line( cell.target, 40, cell.target, cell.height );
+  }
+
+  ctx.restore();
+}
+
+function line( x1, y1, x2, y2 ) {
+  ctx.beginPath();
+  ctx.moveTo( x1, y1 );
+  ctx.lineTo( x2, y2 );
+  ctx.stroke();
+  ctx.closePath();
+}
+
+function circle( x, y, radius ) {
+  ctx.beginPath();
+  ctx.arc( x, y, radius, 0, Math.PI * 2 );
+  ctx.fill();
+  ctx.closePath();
+}
+
+// -------------------------- mouse -------------------------- //
+
+var isDragging = false;
+
+var dragStartX;
+
+function onMousedown( event ) {
+  event.preventDefault();
+  isDragging = true;
+  window.addEventListener( 'mousemove', onMousemove, false );
+  window.addEventListener( 'mouseup', onMouseup, false );
+  dragStartX = event.pageX;
+  slider.dragStartX = slider.x;
+  slider.velocity = 0;
+}
+
+var previousX;
+var previousTime;
+var currentTime;
+
+function onMousemove( event ) {
+  // previous
+  previousX = slider.x;
+  previousTime = currentTime;
+  // current
+  var moveX = event.pageX - dragStartX;
+  var dragX = slider.dragStartX + moveX;
+  // limit dragging beyond left bound
+  dragX = quadLimit( dragX, leftBound, canvasW / 2, canvasW );
+  // limit dragging beyond right bound
+  var rightDragBound = rightBound - slider.width;
+  dragX = quadLimit( dragX, rightDragBound, rightDragBound - canvasW / 2, rightDragBound - canvasW );
+  slider.x = dragX;
+  currentTime = new Date();
+}
+
+function onMouseup( event ) {
+  dragEnd();
+  window.removeEventListener( 'mousemove', onMousemove, false );
+  window.removeEventListener( 'mousemove', onMouseup, false );
+}
+
+function dragEnd() {
+  if ( previousX ) {
+    // set slider velocity
+    slider.velocity = ( slider.x - previousX ) / ( currentTime - previousTime );
+    slider.velocity *= 1000 / 60;
+    // reset previousX
+    previousX = null;
+  }
+
+  isDragging = false;
+
+}