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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
}
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