Chart render on Windows is weird.

[AllenDang]

I found the chart render on Windows 7 is incomplete and weird. Below is the chart rendered by same code on MacOS and Windows.

The X Axis is missing and transparent background doesn't work on Windows.

I'm using the latest checkout from main branch.

MacOS

Windows

Here is the code I'm using to generate the chart.

  graph := chart.Chart{
		Width:  width,
		Height: height,
		Font:   f,
		Background: chart.Style{
			Padding: chart.Box{
				Top:  20,
				Left: 20,
			},
			FillColor: drawing.Color{R: 1, G: 1, B: 1, A: 0},
		},
		Canvas: chart.Style{
			FillColor: drawing.Color{R: 1, G: 1, B: 1, A: 0},
		},
		XAxis: chart.XAxis{
			Style: chart.Style{
				StrokeColor: drawing.ColorWhite,
				FontColor:   drawing.ColorWhite,
			},
			ValueFormatter: chart.TimeDateValueFormatter,
		},
		YAxis: chart.YAxis{
			Style: chart.Style{
				StrokeColor: drawing.ColorWhite,
				FontColor:   drawing.ColorWhite,
			},
		},
		Series: []chart.Series{
			chart.TimeSeries{
				Name: "充值金额",
				Style: chart.Style{
					StrokeWidth: 2,
				},
				XValues: weekSeries,
				YValues: paidSeries,
			},
			chart.TimeSeries{
				Name: "消息条数",
				Style: chart.Style{
					StrokeWidth: 2,
				},
				XValues: weekSeries,
				YValues: msgSeries,
			},
		},
	}

	graph.Elements = []chart.Renderable{
		chart.Legend(&graph, chart.Style{
			StrokeColor: drawing.ColorWhite,
			FontColor:   drawing.ColorWhite,
			FillColor:   drawing.Color{R: 1, G: 1, B: 1, A: 0},
		}),
	}

	collector := &chart.ImageWriter{}
	graph.Render(chart.PNG, collector)

	img, _ := collector.Image()
	if r, ok := img.(*image.RGBA); ok {
		return r
	}

	return nil