1package onelead
 2
 3import (
 4	"image/color"
 5	"math"
 6	"odoki-firmware/constants"
 7	"odoki-firmware/ecg"
 8	"odoki-firmware/utils"
 9
10	"tinygo.org/x/drivers/st7789"
11	"tinygo.org/x/tinyfont"
12	"tinygo.org/x/tinyfont/freemono"
13)
14
15var SelectedLead = 1
16var LeadNames = []string{"I", "II", "III"}
17var LastDrawnIndex int16
18
19var DisplayBufferMinMaxes [constants.ChannelCount][2]int32
20
21const PlotHeight = (constants.DisplayHeight - constants.LineHeight*2 - constants.Padding*2)
22
23func DrawPair(display st7789.Device, x, start, end int16) {
24	min := min(start, end)
25	max := max(start, end)
26	display.FillRectangle(constants.Padding+x, constants.Padding+constants.LineHeight*2, 1, PlotHeight, color.RGBA{0, 0, 0, 255})
27	display.FillRectangle(constants.Padding+x, constants.Padding+constants.LineHeight*2+PlotHeight-max, 1, max-min+1, color.RGBA{255, 255, 255, 255})
28}
29
30func IndexToY(index int16) int16 {
31	if DisplayBufferMinMaxes[SelectedLead][0] == DisplayBufferMinMaxes[SelectedLead][1] {
32		return int16(math.Round(0.5 * float64(PlotHeight-1)))
33	}
34	return int16(float64(PlotHeight-1) * utils.RemapInt32FromRange(int(DisplayBufferMinMaxes[SelectedLead][0]), int(DisplayBufferMinMaxes[SelectedLead][1]), ecg.DisplayBuffers[SelectedLead][index]))
35}
36
37func Draw(VoidDisplayed bool, display st7789.Device) bool {
38	if VoidDisplayed {
39		display.FillScreen(color.RGBA{0, 0, 0, 255})
40		tinyfont.WriteLine(&display, &freemono.Bold9pt7b, constants.Padding, constants.Padding+constants.LineHeight, "ECG "+LeadNames[SelectedLead], color.RGBA{255, 255, 255, 255})
41		display.FillRectangle(constants.Padding, constants.Padding+constants.LineHeight*2, constants.DisplayECGBufferSize, PlotHeight, color.RGBA{0, 0, 0, 255})
42		DrawPair(display, constants.Padding, IndexToY(constants.DisplayECGBufferSize-2), IndexToY(constants.DisplayECGBufferSize-1))
43		DrawPair(display, constants.Padding+1, IndexToY(constants.DisplayECGBufferSize-1), IndexToY(0))
44		for i := 2; i < int(constants.DisplayECGBufferSize); i++ {
45			DrawPair(display, int16(i)+constants.Padding, IndexToY(int16(i)-2), IndexToY(int16(i)-1))
46		}
47	}
48	if LastDrawnIndex != ecg.DisplayBufferIndex {
49		DisplayBufferMinMaxes[SelectedLead][0], DisplayBufferMinMaxes[SelectedLead][1] = utils.MinMaxInt32(ecg.DisplayBuffers[SelectedLead][:])
50		lastDisplayBufferIndex := (ecg.DisplayBufferIndex - 1)
51		if lastDisplayBufferIndex == -1 {
52			lastDisplayBufferIndex = constants.DisplayECGBufferSize - 1
53		}
54		beforeLastDisplayBufferIndex := (ecg.DisplayBufferIndex - 2)
55		if beforeLastDisplayBufferIndex < 0 {
56			beforeLastDisplayBufferIndex = constants.DisplayECGBufferSize + beforeLastDisplayBufferIndex
57		}
58		DrawPair(display, ecg.DisplayBufferIndex, IndexToY(beforeLastDisplayBufferIndex), IndexToY(lastDisplayBufferIndex))
59		LastDrawnIndex = ecg.DisplayBufferIndex
60	}
61
62	return false
63}