added quickshell

quickshell/components/Geom.qml

@@ -0,0 +1,100 @@
+pragma Singleton
+
+import QtQuick
+import Quickshell
+
+// Polygon maths for the Persona 5 panel language: everything leans, and corners
+// get chopped rather than rounded.
+Singleton {
+    id: root
+
+    // A right-leaning parallelogram filling w x h. `lean` is the horizontal
+    // offset applied to the top edge, as a fraction of height.
+    function parallelogram(w: real, h: real, lean: real): var {
+        const off = h * lean;
+        return [
+            Qt.point(off, 0),
+            Qt.point(w, 0),
+            Qt.point(w - off, h),
+            Qt.point(0, h)
+        ];
+    }
+
+    // Same, leaning the other way.
+    function parallelogramL(w: real, h: real, lean: real): var {
+        const off = h * lean;
+        return [
+            Qt.point(0, 0),
+            Qt.point(w - off, 0),
+            Qt.point(w, h),
+            Qt.point(off, h)
+        ];
+    }
+
+    function rect(w: real, h: real): var {
+        return [Qt.point(0, 0), Qt.point(w, 0), Qt.point(w, h), Qt.point(0, h)];
+    }
+
+    // Move `dist` px from `p` toward `q`.
+    function toward(p: point, q: point, dist: real): point {
+        const dx = q.x - p.x;
+        const dy = q.y - p.y;
+        const len = Math.hypot(dx, dy);
+        if (len < 0.0001) return p;
+        const t = Math.min(dist, len / 2) / len;
+        return Qt.point(p.x + dx * t, p.y + dy * t);
+    }
+
+    // Chop the listed corners of a polygon. `corners` is an array of indices;
+    // pass null to chop every corner.
+    function chamfer(pts: var, size: real, corners: var): var {
+        if (size <= 0) return root.closed(pts);
+        const n = pts.length;
+        const out = [];
+        for (let i = 0; i < n; i++) {
+            const p = pts[i];
+            if (corners !== null && corners.indexOf(i) === -1) {
+                out.push(p);
+                continue;
+            }
+            out.push(root.toward(p, pts[(i - 1 + n) % n], size));
+            out.push(root.toward(p, pts[(i + 1) % n], size));
+        }
+        return root.closed(out);
+    }
+
+    function closed(pts: var): var {
+        if (pts.length === 0) return pts;
+        const out = pts.slice();
+        out.push(pts[0]);
+        return out;
+    }
+
+    // Shrink a polygon toward its centroid — used for inner strokes.
+    function inset(pts: var, amount: real): var {
+        let cx = 0, cy = 0;
+        for (const p of pts) { cx += p.x; cy += p.y; }
+        cx /= pts.length; cy /= pts.length;
+        return pts.map(p => {
+            const dx = cx - p.x, dy = cy - p.y;
+            const len = Math.hypot(dx, dy);
+            if (len < 0.0001) return p;
+            const t = amount / len;
+            return Qt.point(p.x + dx * t, p.y + dy * t);
+        });
+    }
+
+    // A jagged "torn paper" edge, the Persona 5 speech-bubble signature.
+    // Returns a polygon `w` x `h` whose bottom edge is serrated.
+    function torn(w: real, h: real, teeth: int, depth: real): var {
+        const out = [Qt.point(0, 0), Qt.point(w, 0)];
+        const step = w / teeth;
+        for (let i = 0; i < teeth; i++) {
+            const x1 = w - i * step - step / 2;
+            const x2 = w - (i + 1) * step;
+            out.push(Qt.point(x1, h));
+            out.push(Qt.point(x2, h - depth));
+        }
+        return out;
+    }
+}