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package plot
import (
"bytes"
"github.com/sgreben/jp/pkg/data"
"github.com/sgreben/jp/pkg/draw"
)
// HeatMap is a heatmap
type HeatMap struct{ draw.Heatmap }
// NewHeatMap returns a new line chart
func NewHeatMap(buffer *draw.Buffer) *HeatMap { return &HeatMap{draw.Heatmap{buffer}} }
func (c *HeatMap) drawAxes(paddingX, paddingY int, minX, maxX, minY, maxY float64) {
buffer := c.GetBuffer()
// X axis
buffer.SetRow(1, paddingX, buffer.Width, draw.HorizontalLine)
// Y axis
buffer.SetColumn(1, buffer.Height, paddingX, draw.VerticalLine)
// Corner
buffer.Set(1, paddingX, draw.CornerBottomLeft)
// Labels
buffer.WriteRight(1, 1, Ff(minY))
buffer.WriteLeft(buffer.Height-1, paddingX, Ff(maxY))
buffer.WriteRight(0, paddingX, Ff(minX))
buffer.WriteLeft(0, buffer.Width, Ff(maxX))
}
// Draw implements Chart
func (c *HeatMap) Draw(heatmap *data.Heatmap) string {
var scaleY, scaleX float64
minX := heatmap.X[0].LeftInclusive
maxX := heatmap.X[len(heatmap.X)-1].Right
minY := heatmap.Y[0].LeftInclusive
maxY := heatmap.Y[len(heatmap.Y)-1].Right
minLabelWidth := len(Ff(minY))
maxLabelWidth := len(Ff(maxY))
paddingX := minLabelWidth + 1
paddingY := 2
if minLabelWidth < maxLabelWidth {
paddingX = maxLabelWidth + 1
}
chartWidth := c.Size().Width - (paddingX + 1)
chartHeight := c.Size().Height - paddingY
scaleX = float64(chartWidth) / (maxX - minX)
scaleY = float64(chartHeight) / (maxY - minY)
for i := range heatmap.Z {
for j := range heatmap.Z[i] {
x0 := int((heatmap.X[j].LeftInclusive-minX)*scaleX + float64(paddingX+1))
y0 := int((heatmap.Y[i].LeftInclusive-minY)*scaleY + float64(paddingY))
x1 := int((heatmap.X[j].Right-minX)*scaleX + float64(paddingX+1))
y1 := int((heatmap.Y[i].Right-minY)*scaleY + float64(paddingY))
z := heatmap.Z[i][j]
for x := x0; x < x1; x++ {
for y := y0; y < y1; y++ {
c.Set(y, x, z)
}
}
}
}
c.drawAxes(paddingX, paddingY, minX, maxX, minY, maxY)
b := bytes.NewBuffer(nil)
c.GetBuffer().Render(b)
return b.String()
}
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