func (f *Fractal) RenewResolution(w, h int) {
f.width, f.height = w, h
f.height = f.width
var last = f.grid
f.grid = texture.NewPixelGrid(f.width, f.height)
if last != nil {
w, h = last.Sizes()
var xmax, ymax = f.grid.Sizes()
rangewh(w, h, func(x, y int) {
if x < xmax && y < ymax {
var col = last.GetPixel24(x, y)
f.grid.SetPixel24(x, y, col)
}
})
}
f.grid.SetAlpha(255)
f.renewTexture()
}
func NewFontTexture(font *truetype.Font, text string, size int) *FontTexture {
this := new(FontTexture)
this.text, this.size, this.name = text, size, textPlusSizeToName(text, size)
lines := strings.Split(text, "\n")
nlines := len(lines)
maxLen := 0
for _, s := range lines {
if len(s) > maxLen {
maxLen = len(s)
}
}
// Initialize the context.
fsize := Double(size)
fg := image.White
bg := image.Transparent
//estimate width and height:
width := int(widthPerChar * fsize * Double(maxLen))
height := int(Double(nlines) * fsize * yfactor)
Println(height, nlines)
rgba := image.NewRGBA(image.Rect(0, 0, width, height))
draw.Draw(rgba, rgba.Bounds(), bg, image.ZP, draw.Src)
c := freetype.NewContext()
c.SetDPI(cdpi)
c.SetFont(font)
c.SetFontSize(fsize.F())
c.SetClip(rgba.Bounds())
c.SetDst(rgba)
c.SetSrc(fg)
// Draw the text.
ptf32 := c.PointToFix32((fsize * cspacing).F())
pt := freetype.Pt(0, size)
//pt := freetype.Pt(0, 1)
for _, s := range lines {
_, err := c.DrawString(s, pt)
//Println(s)
if err != nil {
log.Println(err)
return nil
}
pt.Y += ptf32
}
//find actual bounds:
xmin, xmax, ymin, ymax := 111111, 0, 111111, 0
bounds := rgba.Bounds()
//Println(bounds.Min.X, bounds.Max.X, bounds.Min.Y, bounds.Max.Y)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
_, _, _, a := rgba.At(x, bounds.Max.Y-y-1).RGBA()
if a != 0 {
if x < xmin {
xmin = x
}
if x > xmax {
xmax = x
}
if y < ymin {
ymin = y
}
if y > ymax {
ymax = y
}
}
}
}
//Println(bounds.Min.X, bounds.Max.X, bounds.Min.Y, bounds.Max.Y)
//fill a pixel grid for the textureData
w, h := xmax-xmin+1, ymax-ymin+1
grid := texture.NewPixelGrid(w, h)
for y := ymin; y <= ymax; y++ {
for x := xmin; x <= xmax; x++ {
r, g, b, a := rgba.At(x, bounds.Max.Y-y-1).RGBA()
xx, yy := x-xmin, y-ymin
grid.SetPixel(xx, yy, NewColor32(uint8(r/256), uint8(g/256), uint8(b/256), uint8(a/256)))
}
}
grid.WriteToFile("fonttest")
this.rgba, this.context = rgba, c
td := texture.NewTextureData(this.name)
td.Pix = grid
td.CreateMipmaps()
td.LoadIntoGL()
this.textureData = td
w, h = this.textureData.Sizes()
this.widthFactor = Double(w) / Double(h)
return this
}