94 lines
1.7 KiB
Go
94 lines
1.7 KiB
Go
package gg
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import (
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"fmt"
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"image"
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"image/draw"
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"image/png"
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"io/ioutil"
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"math"
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"os"
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"strings"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font"
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"golang.org/x/image/math/fixed"
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)
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func Radians(degrees float64) float64 {
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return degrees * math.Pi / 180
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}
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func Degrees(radians float64) float64 {
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return radians * 180 / math.Pi
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}
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func LoadPNG(path string) (image.Image, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return png.Decode(file)
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}
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func SavePNG(path string, im image.Image) error {
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file, err := os.Create(path)
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if err != nil {
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return err
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}
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defer file.Close()
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return png.Encode(file, im)
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}
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func imageToRGBA(src image.Image) *image.RGBA {
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dst := image.NewRGBA(src.Bounds())
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draw.Draw(dst, dst.Rect, src, image.ZP, draw.Src)
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return dst
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}
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func parseHexColor(x string) (r, g, b, a int) {
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x = strings.TrimPrefix(x, "#")
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a = 255
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if len(x) == 3 {
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format := "%1x%1x%1x"
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fmt.Sscanf(x, format, &r, &g, &b)
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r |= r << 4
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g |= g << 4
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b |= b << 4
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}
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if len(x) == 6 {
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format := "%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b)
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}
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if len(x) == 8 {
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format := "%02x%02x%02x%02x"
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fmt.Sscanf(x, format, &r, &g, &b, &a)
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}
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return
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}
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func fp(x, y float64) fixed.Point26_6 {
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return fixed.Point26_6{fixed.Int26_6(x * 64), fixed.Int26_6(y * 64)}
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}
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func fi(x float64) fixed.Int26_6 {
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return fixed.Int26_6(x * 64)
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}
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func loadFontFace(path string, points float64) font.Face {
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fontBytes, err := ioutil.ReadFile(path)
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if err != nil {
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panic(err)
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}
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f, err := truetype.Parse(fontBytes)
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if err != nil {
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panic(err)
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}
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return truetype.NewFace(f, &truetype.Options{
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Size: points,
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// Hinting: font.HintingFull,
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})
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}
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