1 files changed, 84 insertions, 0 deletions
diff --git a/input-lag/js/main.js b/input-lag/js/main.js
new file mode 100644
index 0000000..8756bcc
--- /dev/null
+++ b/input-lag/js/main.js
@@ -0,0 +1,84 @@
+var margin = {
+    top: 20,
+    right: 10,
+    bottom: 20,
+    left: 10
+};
+var width = screen.width - margin.left - margin.right;
+var height = screen.height - margin.top - margin.bottom;
+var circleRadius = 20;
+var delay = 100; // in ms
+var circleOffset = circleRadius;
+
+var svg = d3.select("body").append("svg")
+    .attr("width", width + margin.left + margin.right)
+    .attr("height", height + margin.top + margin.bottom)
+    .append("g")
+    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
+
+var delays = [1, 5, 10, 20, 50, 100, 500, 1000, 2000];
+
+var circle2 = svg.append('circle')
+    .attr('cx', (width / 2) - circleOffset)
+    .attr('cy', (height / 2) - circleOffset)
+    .attr('r', circleRadius)
+    .attr('fill', 'red')
+
+var circle1 = svg.append('circle')
+    .attr('cx', (width / 2) - circleOffset)
+    .attr('cy', (height / 2) - circleOffset)
+    .attr('r', circleRadius)
+    .attr('fill', 'gray')
+
+var ds = svg.selectAll('.delay')
+    .data(delays)
+    .enter()
+    .append('g')
+    .attr('class', 'delay')
+    .attr('left', 100)
+    .attr('top', 50)
+    .attr('transform', function (d, i) {
+        return 'translate(' + i * 100 + ', 0)';
+    })
+
+function updateButtons() {
+    svg.selectAll('.delay')
+        .select('text')
+        .attr('fill', function (d) {
+            return d === delay ? 'black' : 'lightblue'
+        })
+}
+
+ds.append('text')
+    .text(function (d) {
+        return d + ' ms';
+    })
+    .on('click', function (d) {
+        delay = d;
+        updateButtons();
+    });
+
+svg.append('rect')
+    .attr('height', height)
+    .attr('width', width)
+    .attr('opacity', 0)
+    .on('mousemove', function () {
+        var start = performance.now();
+        var x = d3.event.x;
+        var y = d3.event.y;
+        circle1.attr('cx', x - circleOffset / 2)
+        circle1.attr('cy', y - circleOffset)
+
+        var step = function (timestamp) {
+            if (timestamp - start < delay) {
+                window.requestAnimationFrame(step);
+            } else {
+                circle2.attr('cx', x - circleOffset / 2);
+                circle2.attr('cy', y - circleOffset);
+            }
+        }
+
+        window.requestAnimationFrame(step);
+    })
+
+updateButtons();
+\ No newline at end of file