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Improve dynamic font size calculation in text-image

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This commit is contained in:
Daniele Tonon
2023-12-29 14:51:22 +01:00
parent 8d6b3f5cd9
commit 37a05bf2a4
1 changed files with 11 additions and 13 deletions
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24
render_image.go
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@@ -182,29 +182,27 @@ func drawText(paragraphs []string, width, height int, dynamicResize bool) image.
color := color.RGBA{R: 255, G: 230, B: 238, A: 255} color := color.RGBA{R: 255, G: 230, B: 238, A: 255}
img := image.NewNRGBA(image.Rect(0, 0, width, height)) img := image.NewNRGBA(image.Rect(0, 0, width, height))
joinedContent := strings.Join(paragraphs, "\n") joinedContent := strings.Join(paragraphs, " \n") // The space before the \n is necessary
if dynamicResize && len(joinedContent) < 141 { if dynamicResize && len(joinedContent) < 141 {
FONT_SIZE = 7 fontSizeTest := 7.0
step := 0.5
img := gg.NewContext(width, height) img := gg.NewContext(width, height)
fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf") fontData, _ := fonts.ReadFile("fonts/NotoSans.ttf")
ttf, _ := truetype.Parse(fontData) ttf, _ := truetype.Parse(fontData)
i := 1 for {
lineSpacing := 1.2 fontSizeTest += step
for i < 20 {
FONT_SIZE += i
img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{ img.SetFontFace(truetype.NewFace(ttf, &truetype.Options{
Size: float64(FONT_SIZE), Size: fontSizeTest,
DPI: 260, DPI: 260,
})) }))
wrappedContent := strings.Join(img.WordWrap(joinedContent, float64(width-120)), "\n") wrappedContent := img.WordWrap(joinedContent, float64(width-70))
_, checkHeight := img.MeasureMultilineString(wrappedContent, lineSpacing) _, checkHeight := img.MeasureMultilineString(strings.Join(wrappedContent, "\n"), 1.0)
if checkHeight > float64(height-70-60*2) { if checkHeight > float64(height-70-60*2) || fontSizeTest > 50 {
FONT_SIZE -= 1 fontSizeTest -= step
break break
} }
i += 1
} }
FONT_SIZE = FONT_SIZE*4 - 2 FONT_SIZE = int(fontSizeTest * (float64(FONT_SIZE) / 7))
} }
lineNumber := 1 lineNumber := 1