aboutsummaryrefslogtreecommitdiff
path: root/xM
diff options
context:
space:
mode:
Diffstat (limited to 'xM')
-rw-r--r--xM/gen-icon.swift34
1 files changed, 13 insertions, 21 deletions
diff --git a/xM/gen-icon.swift b/xM/gen-icon.swift
index 5e29016..712e9e6 100644
--- a/xM/gen-icon.swift
+++ b/xM/gen-icon.swift
@@ -1,4 +1,4 @@
-// gen-icon.awk: generate a program icon for xM in the Apple icon format
+// gen-icon.swift: generate a program icon for xM in the Apple icon format
//
// Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
// SPDX-License-Identifier: 0BSD
@@ -10,24 +10,17 @@ import Foundation
import ImageIO
import UniformTypeIdentifiers
-// XXX: Not even AppKit provides real superelliptic squircles; screw it.
-func drawSquircle(context: CGContext, bounds: CGRect, radius: CGFloat) {
- context.move(to: CGPointMake(bounds.minX, bounds.maxY - radius))
- context.addArc(
- center: CGPointMake(bounds.minX + radius, bounds.maxY - radius),
- radius: radius, startAngle: .pi, endAngle: .pi / 2, clockwise: true)
- context.addLine(to: CGPointMake(bounds.maxX - radius, bounds.maxY))
- context.addArc(
- center: CGPointMake(bounds.maxX - radius, bounds.maxY - radius),
- radius: radius, startAngle: .pi / 2, endAngle: 0, clockwise: true)
- context.addLine(to: CGPointMake(bounds.maxX, bounds.maxY - radius))
- context.addArc(
- center: CGPointMake(bounds.maxX - radius, bounds.minY + radius),
- radius: radius, startAngle: 0, endAngle: .pi / -2, clockwise: true)
- context.addLine(to: CGPointMake(bounds.minX + radius, bounds.minY))
- context.addArc(
- center: CGPointMake(bounds.minX + radius, bounds.minY + radius),
- radius: radius, startAngle: .pi / -2, endAngle: .pi, clockwise: true)
+// Apple uses something that's close to a "quintic superellipse" in their icons,
+// but doesn't quite match. Either way, it looks better than rounded rectangles.
+func addSquircle(context: CGContext, bounds: CGRect) {
+ context.move(to: CGPoint(x: bounds.maxX, y: bounds.midY))
+ for theta in stride(from: 0.0, to: .pi * 2, by: .pi / 1e4) {
+ let x = pow(abs(cos(theta)), 2 / 5.0) * bounds.width / 2
+ * CGFloat(signOf: cos(theta), magnitudeOf: 1) + bounds.midX
+ let y = pow(abs(sin(theta)), 2 / 5.0) * bounds.height / 2
+ * CGFloat(signOf: sin(theta), magnitudeOf: 1) + bounds.midY
+ context.addLine(to: CGPoint(x: x, y: y))
+ }
context.closePath()
}
@@ -42,8 +35,7 @@ func drawIcon(scale: CGFloat) -> CGImage? {
context.scaleBy(x: scale, y: scale)
let bounds = CGRectMake(100, 100, size.width - 200, size.height - 200)
- // The radius was something like size.{width,height}/6.4, at least for iOS.
- drawSquircle(context: context, bounds: bounds, radius: 180)
+ addSquircle(context: context, bounds: bounds)
let squircle = context.path!
// Gradients don't draw shadows, so draw it separately.