go-chart/vector_renderer_test.go

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package chart
import (
"bytes"
"strings"
"testing"
"github.com/blendlabs/go-assert"
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"github.com/wcharczuk/go-chart/drawing"
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)
func TestVectorRendererPath(t *testing.T) {
assert := assert.New(t)
vr, err := SVG(100, 100)
assert.Nil(err)
typed, isTyped := vr.(*vectorRenderer)
assert.True(isTyped)
typed.MoveTo(0, 0)
typed.LineTo(100, 100)
typed.LineTo(0, 100)
typed.Close()
typed.FillStroke()
buffer := bytes.NewBuffer([]byte{})
err = typed.Save(buffer)
assert.Nil(err)
raw := string(buffer.Bytes())
assert.True(strings.HasPrefix(raw, "<svg"))
assert.True(strings.HasSuffix(raw, "</svg>"))
}
func TestVectorRendererMeasureText(t *testing.T) {
assert := assert.New(t)
f, err := GetDefaultFont()
assert.Nil(err)
vr, err := SVG(100, 100)
assert.Nil(err)
vr.SetDPI(DefaultDPI)
vr.SetFont(f)
vr.SetFontSize(12.0)
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tb := vr.MeasureText("Ljp")
assert.Equal(21, tb.Width())
assert.Equal(15, tb.Height())
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}
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func TestCanvasStyleSVG(t *testing.T) {
assert := assert.New(t)
f, err := GetDefaultFont()
assert.Nil(err)
set := Style{
StrokeColor: drawing.ColorWhite,
StrokeWidth: 5.0,
FillColor: drawing.ColorWhite,
FontColor: drawing.ColorWhite,
Font: f,
Padding: DefaultBackgroundPadding,
}
canvas := &canvas{dpi: DefaultDPI}
svgString := canvas.styleAsSVG(set)
assert.NotEmpty(svgString)
assert.True(strings.Contains(svgString, "stroke:rgba(255,255,255,1.0)"))
assert.True(strings.Contains(svgString, "stroke-width:5"))
assert.True(strings.Contains(svgString, "fill:rgba(255,255,255,1.0)"))
}