func drawFitCentered(c *freetype.Context, text string, img image.Image, bottom bool) {
lines, longest := splitLines(text)
// Calculate the font size that fits the longest line within the image width.
// Simplistic approach -- calculate the width of the line at MaxFontSize, then divide it
// down to get the appropriate font size. Not quite right, but close enough.
size := MaxFontSize
c.SetFontSize(MaxFontSize)
fw, _, _ := c.MeasureString(lines[longest])
w := int(fw >> 8)
ratio := float64(img.Bounds().Dx()-16) / float64(w)
size *= ratio
if size > MaxFontSize {
size = MaxFontSize
} else {
w = int(float64(w) * ratio)
}
c.SetFontSize(size)
pos := 0
for _, line := range lines {
fw, _, _ = c.MeasureString(line)
w := int(fw >> 8)
lineHeight := int(size * 1.2)
x := img.Bounds().Dx()/2 - w/2
y := 0
if bottom {
y = img.Bounds().Max.Y - 8 - (len(lines)-1)*lineHeight + pos
} else {
y = int(size) + 8 + pos
}
pos += lineHeight
drawBorderedText(c, line, x, y)
}
}
