From cad8296e28d7c233088e9e0ddc814440c528394f Mon Sep 17 00:00:00 2001
From: vicanso <vicansocanbico@gmail.com>
Date: Sun, 1 May 2022 11:15:13 +0800
Subject: [PATCH] fix: support chinese for axis, #4

---
 README_zh.md | 2 ++
 chart.go     | 1 +
 xaxis.go     | 3 +++
 yaxis.go     | 1 +
 4 files changed, 7 insertions(+)

diff --git a/README_zh.md b/README_zh.md
index 6d794e0..57d9db4 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -219,3 +219,5 @@ BenchmarkMultiChartSVGRender-8               367           3356325 ns/op
 
 默认使用的字符为`roboto`为英文字体库，因此如果需要显示中文字符需要增加中文字体库，`InstallFont`函数可添加对应的字体库，成功添加之后则指定`title.textStyle.fontFamily`即可。
 在浏览器中使用`svg`时，如果指定的`fontFamily`不支持中文字符，展示的中文并不会乱码，但是会导致在计算字符宽度等错误。
+
+[中文字库noto-cjk](https://github.com/googlefonts/noto-cjk)
\ No newline at end of file
diff --git a/chart.go b/chart.go
index 6f4740f..21f2071 100644
--- a/chart.go
+++ b/chart.go
@@ -190,6 +190,7 @@ func (o *ChartOption) FillDefault(theme string) {
 	if o.XAxis.Theme == "" {
 		o.XAxis.Theme = theme
 	}
+	o.XAxis.Font = o.Font
 }
 
 func (o *ChartOption) getWidth() int {
diff --git a/xaxis.go b/xaxis.go
index 1dca7bb..bd9d951 100644
--- a/xaxis.go
+++ b/xaxis.go
@@ -23,10 +23,12 @@
 package charts
 
 import (
+	"github.com/golang/freetype/truetype"
 	"github.com/wcharczuk/go-chart/v2"
 )
 
 type XAxisOption struct {
+	Font *truetype.Font
 	// The boundary gap on both sides of a coordinate axis.
 	// Nil or *true means the center part of two axis ticks
 	BoundaryGap *bool
@@ -66,6 +68,7 @@ func drawXAxis(p *Draw, opt *XAxisOption, yAxisCount int) (int, *Range, error) {
 			Right: right,
 		}),
 	)
+	dXAxis.Font = opt.Font
 	if err != nil {
 		return 0, nil, err
 	}
diff --git a/yaxis.go b/yaxis.go
index 99093ec..1505d39 100644
--- a/yaxis.go
+++ b/yaxis.go
@@ -96,6 +96,7 @@ func drawYAxis(p *Draw, opt *ChartOption, axisIndex, xAxisHeight int, padding ch
 	if err != nil {
 		return nil, err
 	}
+	dYAxis.Font = opt.Font
 	NewAxis(dYAxis, data, style).Render()
 	yRange.Size = dYAxis.Box.Height()
 	return &yRange, nil