func compose(data Message, bg ledmatrix.Color) *ledmatrix.Writer {
matrix := ledmatrix.NewMatrix(tower.Rows, tower.Columns)
writer := ledmatrix.NewWriter(matrix)
writer.Spacer(matrix.Columns, 0) // Blank bootstrap
for _, line := range data {
var r, g, b int
var f bitmapfont.Font
if line.Font < 8 {
f = bitmapfont.F68
} else {
f = bitmapfont.F88
}
fmt.Sscanf(line.Color, "#%02x%02x%02x", &r, &g, &b)
writer.WriteText(line.Text, f, ledmatrix.RGB(r, g, b), bg)
}
return writer
}
// renderdeTextMessage convert a text to a LED bitmap matrix.
// This method is used by the displayBuilder gorouting.
func textToBitmap(text []Line, bg uint32) *ledmatrix.Matrix {
matrix := ledmatrix.NewMatrix(rows, 0)
writer := ledmatrix.NewWriter(matrix)
writer.Spacer(matrix.Columns, 0) // Blank bootstrap
for _, line := range text {
var r, g, b int
var f font.Font
if line.Font < 8 {
f = font.Font6x8
} else {
f = font.Font8x8
}
fmt.Sscanf(line.Color, "#%02x%02x%02x", &r, &g, &b)
writer.WriteText(line.Text, f, ledmatrix.RGB(r, g, b), bg)
}
return matrix
}
// blank generates a "space" from the given color
func blank(len int, bg uint32) *ledmatrix.Matrix {
matrix := ledmatrix.NewMatrix(rows, columns)
writer := ledmatrix.NewWriter(matrix)
writer.Spacer(columns, bg) // Blank spacer
return matrix
}