replace zxq.co/ripple/hanayo

vendor/github.com/boombuler/barcode/pdf417/dimensions.go

@@ -0,0 +1,57 @@
+package pdf417
+
+import "math"
+
+const (
+	minCols         = 2
+	maxCols         = 30
+	maxRows         = 30
+	minRows         = 2
+	moduleHeight    = 2
+	preferred_ratio = 3.0
+)
+
+func calculateNumberOfRows(m, k, c int) int {
+	r := ((m + 1 + k) / c) + 1
+	if c*r >= (m + 1 + k + c) {
+		r--
+	}
+	return r
+}
+
+func calcDimensions(dataWords, eccWords int) (cols, rows int) {
+	ratio := 0.0
+	cols = 0
+	rows = 0
+
+	for c := minCols; c <= maxCols; c++ {
+		r := calculateNumberOfRows(dataWords, eccWords, c)
+
+		if r < minRows {
+			break
+		}
+
+		if r > maxRows {
+			continue
+		}
+
+		newRatio := float64(17*cols+69) / float64(rows*moduleHeight)
+		if rows != 0 && math.Abs(newRatio-preferred_ratio) > math.Abs(ratio-preferred_ratio) {
+			continue
+		}
+
+		ratio = newRatio
+		cols = c
+		rows = r
+	}
+
+	if rows == 0 {
+		r := calculateNumberOfRows(dataWords, eccWords, minCols)
+		if r < minRows {
+			rows = minRows
+			cols = minCols
+		}
+	}
+
+	return
+}