78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// MIT License
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// Copyright (c) 2022 Tree Xie
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package charts
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import (
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"errors"
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"sync"
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"github.com/golang/freetype/truetype"
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"git.smarteching.com/zeni/go-chart/v2/roboto"
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)
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var fonts = sync.Map{}
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var ErrFontNotExists = errors.New("font is not exists")
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var defaultFontFamily = "defaultFontFamily"
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func init() {
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name := "roboto"
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_ = InstallFont(name, roboto.Roboto)
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font, _ := GetFont(name)
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SetDefaultFont(font)
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}
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// InstallFont installs the font for charts
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func InstallFont(fontFamily string, data []byte) error {
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font, err := truetype.Parse(data)
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if err != nil {
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return err
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}
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fonts.Store(fontFamily, font)
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return nil
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}
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// GetDefaultFont get default font
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func GetDefaultFont() (*truetype.Font, error) {
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return GetFont(defaultFontFamily)
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}
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// SetDefaultFont set default font
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func SetDefaultFont(font *truetype.Font) {
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if font == nil {
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return
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}
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fonts.Store(defaultFontFamily, font)
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}
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// GetFont get the font by font family
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func GetFont(fontFamily string) (*truetype.Font, error) {
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value, ok := fonts.Load(fontFamily)
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if !ok {
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return nil, ErrFontNotExists
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}
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f, ok := value.(*truetype.Font)
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if !ok {
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return nil, ErrFontNotExists
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}
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return f, nil
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}
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