doodle/pkg/drawtool/text_tool.go

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package drawtool
import (
2022-09-24 22:17:25 +00:00
"git.kirsle.net/SketchyMaze/doodle/pkg/native"
"git.kirsle.net/go/render"
"git.kirsle.net/go/ui"
)
// TextSettings holds currently selected Text Tool settings.
type TextSettings struct {
Font string // like 'DejaVuSans.ttf'
Size int
Message string
Label *ui.Label // cached label texture
}
// Currently active settings (global variable)
var TT TextSettings
// IsZero checks if the TextSettings are populated.
func (tt TextSettings) IsZero() bool {
return tt.Font == "" && tt.Size == 0 && tt.Message == ""
}
// ToStroke converts a TextSettings configuration into a Freehand
// Stroke, coloring in all of the pixels.
func (tt TextSettings) ToStroke(e render.Engine, color render.Color, at render.Point) (*Stroke, error) {
stroke := NewStroke(Freehand, color)
// Render the text to a Go image so we can get the colors from
// it uniformly.
img, err := native.TextToImage(e, tt.Label.Font)
if err != nil {
return nil, err
}
// Pull all its pixels.
var (
max = img.Bounds().Max
x = 0
y = 0
)
for x = 0; x < max.X; x++ {
for y = 0; y < max.Y; y++ {
hue := img.At(x, y)
r, g, b, _ := hue.RGBA()
if r == 65535 && g == r && b == r {
continue
}
stroke.Points = append(stroke.Points, render.NewPoint(x+at.X, y+at.Y))
}
}
return stroke, nil
}