Initial commit

2026-04-29 07:19:21 +03:00
commit 9a8cdfa08a
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+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+import QtQuick
+import QtQuick3D
+
+// The rotation math is based on the paper
+// ARCBALL:
+// A User Interface for Specifying Three-Dimensional Orientation Using a Mouse
+// by Ken Shoemake, 1992
+Item {
+    id: root
+    visible: false
+
+    required property Node controlledObject
+    property vector3d lastPos: Qt.vector3d(0, 0, 0)
+    property bool moving: false
+
+    // From Shoemake 1992:
+    // pt.x <- (screen.x - center.x)/radius;
+    // pt.y <- (screen.y - center.y)/radius;
+    // r <- pt.x*pt.x + pt.y*pt.y;
+    // IF r > 1.0
+    //   THEN s <- 1.0/Sqrt[r];
+    //     pt.x <- s*pt.x;
+    //     pt.y <- s*pt.y;
+    //     pt.z <- 0.0;
+    //   ELSE pt.z <- Sqrt[1.0 - r] ;
+    function pos2DToPos3D(posNDC) {
+        var pt = Qt.vector3d(posNDC.x, posNDC.y, 0)
+        let r = posNDC.x * posNDC.x + posNDC.y * posNDC.y
+        if (r > 1.0) {
+            let s = 1.0 / Math.sqrt(r)
+            pt.x = s * pt.x
+            pt.y = s * pt.y
+            pt.z = 0.0
+        } else {
+            pt.z = Math.sqrt(1.0 - r)
+        }
+
+        return pt
+    }
+
+    function mousePressed(posNDC) {
+        lastPos = pos2DToPos3D(posNDC)
+        moving = true
+    }
+
+    function mouseReleased(posNDC) {
+        moving = false
+    }
+
+    function mouseMoved(posNDC) {
+        if (!moving)
+            return
+
+        let currentPos = pos2DToPos3D(posNDC)
+
+        // From Shoemake 1992:
+        // [q.x, q.y, q.z] <- V3_Cross[pO, p1];
+        // q.w <- V3_Dot[pO, p1];
+        // qnow <- QuatMul[q, qstart];
+        let p0 = lastPos
+        let p1 = currentPos
+        let p0p1 = p0.crossProduct(p1)
+        let q = Qt.quaternion(p0.dotProduct(p1), p0p1.x, p0p1.y, p0p1.z)
+        let qnow = q.times(controlledObject.rotation)
+        controlledObject.rotation = qnow
+        lastPos = currentPos
+    }
+}