Splits logic and graphics.

1 files changed, 94 insertions, 0 deletions

diff --git a/cirsim_fyne/node.go b/cirsim_fyne/node.go
new file mode 100644
index 0000000..84a15eb
--- /dev/null
+++ b/cirsim_fyne/node.go
@@ -0,0 +1,94 @@
+package cirsim_fyne
+
+import (
+	"fmt"
+	"io"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/widget"
+	"github.com/wcharczuk/go-chart/v2"
+	"github.com/wcharczuk/go-chart/v2/drawing"
+)
+
+type node struct {
+	widget.BaseWidget
+	pos             fyne.Position
+	voltageOverTime []float64
+	voltageRange    chart.Range
+	chart           *canvas.Image
+}
+
+func newNode(settings io.Reader, r chart.Range) *node {
+	var n node
+	_, err := fmt.Fscanf(settings, "%f %f\n", &n.pos.X, &n.pos.Y)
+	if err != nil {
+		return nil
+	}
+	n.voltageRange = r
+	return &n
+}
+
+func (n *node) renderChart(voltageOverTime []float64) {
+	graph := chart.Chart{
+		Width:        chartWidth,
+		Height:       chartHeight,
+		ColorPalette: &nodeColorPalette{},
+		XAxis:        chart.HideXAxis(),
+		YAxis: chart.YAxis{
+			Style: chart.Hidden(),
+			Range: n.voltageRange,
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: chart.LinearRange(0, float64(len(voltageOverTime))-1),
+				YValues: voltageOverTime,
+			},
+		},
+	}
+	writer := &chart.ImageWriter{}
+	graph.Render(chart.PNG, writer)
+	img, _ := writer.Image()
+	n.chart = canvas.NewImageFromImage(img)
+}
+
+type nodeColorPalette struct{}
+
+func (*nodeColorPalette) BackgroundColor() drawing.Color {
+	return drawing.ColorTransparent
+}
+func (*nodeColorPalette) BackgroundStrokeColor() drawing.Color {
+	return drawing.ColorTransparent
+}
+func (*nodeColorPalette) CanvasColor() drawing.Color {
+	return drawing.Color{
+		R: voltageCanvasR,
+		G: voltageCanvasG,
+		B: voltageCanvasB,
+		A: voltageCanvasA,
+	}
+}
+func (*nodeColorPalette) CanvasStrokeColor() drawing.Color {
+	return drawing.ColorTransparent
+}
+func (*nodeColorPalette) AxisStrokeColor() drawing.Color {
+	return drawing.ColorTransparent
+}
+func (*nodeColorPalette) TextColor() drawing.Color {
+	return drawing.ColorTransparent
+}
+func (*nodeColorPalette) GetSeriesColor(index int) drawing.Color {
+	return drawing.Color{R: voltageR, G: voltageG, B: voltageB, A: voltageA}
+}
+
+func (n *node) CreateRenderer() fyne.WidgetRenderer { return n }
+func (n *node) Layout(s fyne.Size) {
+	n.chart.Resize(s)
+	n.chart.Move(fyne.NewPos(0, 0))
+}
+func (n *node) MinSize() fyne.Size { return n.chart.MinSize() }
+func (n *node) Refresh()           {}
+func (n *node) Destroy()           {}
+func (n *node) Objects() []fyne.CanvasObject {
+	return []fyne.CanvasObject{n.chart}
+}