renaming backend, cellxgene to server, client respectively

2026-09-28 11:58:12 +08:00 · 2018-06-26 11:41:32 -07:00
parent 59dcfe2bc4
commit dd5fa57259
97 changed files with 4 additions and 7 deletions
@@ -0,0 +1,74 @@
+// jshint esversion: 6
+var createCamera = require("orbit-camera");
+var createScroll = require("scroll-speed");
+var mp = require("mouse-position");
+var mb = require("mouse-pressed");
+var key = require("key-pressed");
+
+const panSpeed = 0.4;
+const scaleSpeed = 0.5;
+const scaleMax = 3;
+// const scaleMin = 1.15
+const scaleMin = 1.03;
+
+function attachCamera(canvas, opts) {
+  opts = opts || {};
+  opts.pan = opts.pan !== false;
+  opts.scale = opts.scale !== false;
+  opts.rotate = opts.rotate !== false;
+
+  var scroll = createScroll(canvas, opts.scale);
+  var mbut = mb(canvas, opts.rotate);
+  var mpos = mp(canvas);
+  var camera = createCamera([0, 0, 1], [0, 0, -1], [0, 1, 0]);
+
+  camera.tick = tick;
+
+  return camera;
+
+  function tick() {
+    var ctrl = key("<control>") || key("<alt>");
+    var alt = key("<shift>");
+    var height = canvas.height;
+    var width = canvas.width;
+
+    if (opts.rotate && mbut.left && ctrl && !alt) {
+      camera.rotate(
+        [mpos.x / width - 0.5, mpos.y / height - 0.5],
+        [mpos.prevX / width - 0.5, mpos.prevY / height - 0.5]
+      );
+    }
+
+    if ((opts.pan && mbut.right) || (mbut.left && !ctrl && !alt)) {
+      camera.pan([
+        panSpeed *
+          (mpos[0] - mpos.prev[0]) /
+          width *
+          Math.pow(camera.distance, 1),
+        panSpeed *
+          (mpos[1] - mpos.prev[1]) /
+          height *
+          Math.pow(camera.distance, 1)
+      ]);
+    }
+
+    if (opts.scale && scroll[1]) {
+      camera.distance *= Math.exp(scroll[1] * scaleSpeed / height);
+    }
+
+    if (opts.scale && (mbut.middle || (mbut.left && !ctrl && alt))) {
+      var d = mpos.y - mpos.prevY;
+      if (!d) return;
+
+      camera.distance *= Math.exp(d / height);
+    }
+
+    if (camera.distance > scaleMax) camera.distance = scaleMax;
+    if (camera.distance < scaleMin) camera.distance = scaleMin;
+
+    scroll.flush();
+    mpos.flush();
+  }
+}
+
+export default attachCamera;