57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package chart
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// GridLine is a line on a graph canvas.
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type GridLine struct {
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IsMinor bool
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IsVertical bool
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Style Style
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Value float64
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}
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// Major returns if the gridline is a `major` line.
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func (gl GridLine) Major() bool {
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return !gl.IsMinor
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}
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// Minor returns if the gridline is a `minor` line.
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func (gl GridLine) Minor() bool {
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return gl.IsMinor
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}
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// Vertical returns if the line is vertical line or not.
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func (gl GridLine) Vertical() bool {
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return gl.IsVertical
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}
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// Horizontal returns if the line is horizontal line or not.
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func (gl GridLine) Horizontal() bool {
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return !gl.IsVertical
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}
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// Render renders the gridline
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func (gl GridLine) Render(r Renderer, canvasBox Box, ra Range) {
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if gl.IsVertical {
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lineLeft := canvasBox.Left + ra.Translate(gl.Value)
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lineBottom := canvasBox.Bottom
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lineTop := canvasBox.Top
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r.SetStrokeColor(gl.Style.GetStrokeColor(DefaultAxisColor))
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r.SetStrokeWidth(gl.Style.GetStrokeWidth(DefaultAxisLineWidth))
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r.MoveTo(lineLeft, lineBottom)
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r.LineTo(lineLeft, lineTop)
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r.Stroke()
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} else {
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lineLeft := canvasBox.Left
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lineRight := canvasBox.Right
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lineHeight := canvasBox.Bottom - ra.Translate(gl.Value)
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r.SetStrokeColor(gl.Style.GetStrokeColor(DefaultAxisColor))
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r.SetStrokeWidth(gl.Style.GetStrokeWidth(DefaultAxisLineWidth))
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r.MoveTo(lineLeft, lineHeight)
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r.LineTo(lineRight, lineHeight)
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r.Stroke()
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}
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}
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