brianmichel · May 12, 2023 12:45 · May 12, 2023
diff --git a/chartd.swift b/chartd.swift
@@ -0,0 +1,48 @@
+import Foundation
+
+let b62 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
+func encode(data: [Double], min: Double, max: Double) -> String {
+	let r = max - min
+	var bs = [Character](repeating: b62.first!, count: data.count)
+	if r == 0 {
+		for i in 0..<data.count {
+			bs[i] = b62.first!
+		}
+		return String(bs)
+	}
+	let enclen = Double(b62.count - 1)
+	for (i, y) in data.enumerated() {
+		let index = Int(enclen * (y - min) / r)
+		if index >= 0 && index < b62.count {
+			bs[i] = b62[b62.index(b62.startIndex, offsetBy: index)]
+		} else {
+			bs[i] = b62.first!
+		}
+	}
+	return String(bs)
+}
+// http://chartd.co/a.svg?w=580&h=180&d0=caaageehox301yusuurywwqmjdghhhjmrt0yywwuqrs2yslkgfahnomqux666zzvttv0wsmkgdbhmnlrsz6795420xtvtrnjgdadkopqqv256520zxsssokfdZZbeffjltwzzzxussuywrmgbYWaeefjmu100ywsqqrvuoidb&ymin=0&ymax=160000000&t=1+week+@+1+hour&step=1"
+
+let data0 = [1.0, 0.99, 0.9869, 0.95, 0.88]
+let data1 = [0.0, 0.01, 0.02, 0.05, 0.12]
+let encoded0 = encode(data: data0, min: 0.0, max: 1.0)
+let encoded1 = encode(data: data1, min: 0.0, max: 1.0)
+let minTime = Date().timeIntervalSince1970 - Double(data0.count * 24 * 60 * 60)
+let maxTime = Date().timeIntervalSince1970
+
+var components = URLComponents(string: "https://chartd.co/a.svg")
+components?.queryItems = [
+	.init(name: "w", value: "600"),
+	.init(name: "h", value: "200"),
+	.init(name: "d0", value: encoded0),
+	.init(name: "d1", value: encoded1),
+	.init(name: "ymin", value: "0.0"),
+	.init(name: "ymax", value: "1.0"),
+	.init(name: "step", value: "0"),
+	.init(name: "xmin", value: "\(Int(minTime))"),
+	.init(name: "xmax", value: "\(Int(maxTime))"),
+]
+
+print(components!.url)
+
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