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Plot.py
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Plot.py
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#/***************************************************************************/
#/* Raspberry Pi ELM327 OBBII CAN BUS Diagnostic Software. */
#/* */
#/* (C) Jason Birch 2018-05-15 V1.04 */
#/* */
#/* Class: Plot */
#/* Plot a history of selected value data over time. */
#/***************************************************************************/
import os
import datetime
import pygame
import Visual
import Button
import ELM327
PLOT_COUNT = 3
PLOT_POINTS = 512
PLOT_WIDTH = 2
class Plot(Visual.Visual):
def __init__(self, ThisSurface, Name, PressType, xPos, yPos, xLen, yLen, Text):
Visual.Visual.__init__(self, ThisSurface, Name, PressType, xPos, yPos, xLen, yLen, Text)
self.ClearConfig()
#/****************************************************/
#/* Get the PID associated with the specified index. */
#/****************************************************/
def GetPID(self, PlotIndex):
return self.PID[PlotIndex]
#/*******************************************/
#/* Set the PID associated with this gague. */
#/*******************************************/
def SetPID(self, PlotIndex, PID, PidDescription):
self.PID[PlotIndex] = PID
ValueDefinition = PidDescription.split("|")
self.PidDescription[PlotIndex] = PidDescription
if len(ValueDefinition) > ELM327.FIELD_PID_MIN_1:
self.PlotAttrib[PlotIndex]["ValueMin"] = float(ValueDefinition[ELM327.FIELD_PID_MIN_1])
else:
self.PlotAttrib[PlotIndex]["ValueMin"] = 0
if len(ValueDefinition) > ELM327.FIELD_PID_MAX_1:
self.PlotAttrib[PlotIndex]["ValueMax"] = float(ValueDefinition[ELM327.FIELD_PID_MAX_1])
else:
self.PlotAttrib[PlotIndex]["ValueMax"] = 100
if len(ValueDefinition) > ELM327.FIELD_PID_HIGH_1:
self.PlotAttrib[PlotIndex]["ValueHigh"] = float(ValueDefinition[ELM327.FIELD_PID_HIGH_1])
else:
self.PlotAttrib[PlotIndex]["ValueHigh"] = 0
#/***********************************/
#/* Set the data value of a series. */
#/***********************************/
def SetData(self, Index, PidData):
# Check for X axis label conditions and create X axis label when met.
ThisAxisTime = datetime.datetime.now()
if int(self.LastAxisTime.minute/2) != int(ThisAxisTime.minute/2):
self.LastAxisTime = ThisAxisTime
self.xAxisLabels[self.PlotIndex[Index]] = ThisAxisTime.strftime("%H:%M")
# Store provided data.
if type(PidData) is not str and type(PidData) is not tuple:
self.PlotPoints[Index][self.PlotIndex[Index]] = PidData
else:
self.PlotPoints[Index][self.PlotIndex[Index]] = 0
if self.PlotIndex[Index] < PLOT_POINTS:
self.PlotIndex[Index] += 1
#/********************************/
#/* Is the data aquisition full? */
#/********************************/
def IsDataEnd(self, Index):
return (self.PlotIndex[Index] == PLOT_POINTS - 1)
#/***********************************/
#/* Clear all series configuration. */
#/***********************************/
def ClearConfig(self):
self.ClearData()
# ECU PID associated with each plot.
self.PID = [ "", "", "" ]
self.PidDescription = [ "", "", "" ]
self.PlotAttrib = [ {}, {}, {} ]
# Attributes of each plot.
for Index in range(PLOT_COUNT):
self.PlotAttrib[Index] = {
"Colour" : pygame.Color(0x7F * 2**(8*(Index+1)) + 0xFF),
"ValueMin" : 0,
"ValueHigh" : 80,
"ValueMax" : 100,
"Value" : 0,
}
#/************************************************/
#/* Clear all plot data to start a new data log. */
#/************************************************/
def ClearData(self):
self.LastAxisTime = datetime.datetime.now()
self.xAxisLabels = {}
self.PlotIndex = [ 0, 0, 0 ]
self.PlotPoints = [ [0] * PLOT_POINTS, [0] * PLOT_POINTS, [0] * PLOT_POINTS ]
#/**********************************************************************/
#/* Check if an event occurred in this plot area. Perform any required */
#/* actions and let the caller know if the plot area was touched. */
#/**********************************************************************/
def IsEvent(self, EventType, xPos, yPos, PointerButton, xOffset = 0, yOffset = 0):
Result = Visual.Visual.IsEvent(self, EventType, xPos, yPos, PointerButton, xOffset, yOffset)
if Result != False:
Result["BUTTON"] = self.Name
return Result
#/*******************************************/
#/* Load gadgits onto meters tab from disk. */
#/*******************************************/
def LoadSeriesConfig(self, ValidPIDs):
try:
self.ClearConfig()
if os.path.isfile("CONFIG/PLOT_SERIES.CFG"):
File = open("CONFIG/PLOT_SERIES.CFG", 'r')
Index = 0
TextLine = "."
while TextLine != "":
TextLine = File.readline()
TextLine = TextLine.replace("\n", "")
TextElements = TextLine.split('|')
for ThisElement in TextElements:
if ThisElement[:4] == "PID=":
ThisPID = str(ThisElement[4:])
ThisPidDescription = ""
if ThisPID in ValidPIDs:
ThisPidDescription = ValidPIDs[ThisPID]
self.SetPID(Index, ThisPID, ThisPidDescription)
Index += 1
File.close()
except:
# On fail remove all loaded series.
self.ClearConfig()
#/*******************************/
#/* Save series config to disk. */
#/*******************************/
def SaveSeriesConfig(self):
File = open("CONFIG/PLOT_SERIES.CFG", 'w')
for Index in range(PLOT_COUNT):
Data = "PID=" + str(self.PID[Index])
File.write(Data + "\n")
File.close()
#/************************************************/
#/* Draw this plot area on the provided surface. */
#/************************************************/
def Display(self, ThisSurface):
# Draw background.
pygame.draw.rect(ThisSurface, self.ColourFill, (self.xPos, self.yPos, self.xLen, self.yLen), 0)
pygame.draw.rect(ThisSurface, self.ColourBorder, (self.xPos, self.yPos, self.xLen, self.yLen), 1)
# Draw Y axis dividers.
yAxisScale = int(self.yLen - 2*Visual.Y_MARGIN)
yAxisStep = int(yAxisScale / 10)
for yOffset in range(0, yAxisScale, yAxisStep):
pygame.draw.line(ThisSurface, self.ColourGrey, (self.xPos + Visual.X_MARGIN, self.yPos + self.yLen - yOffset), (self.xPos + self.xLen - 2*Visual.X_MARGIN, self.yPos + self.yLen - yOffset), 1)
# Display data scale.
xStep = (self.xLen - 2*Visual.X_MARGIN) / PLOT_POINTS
for Index in self.xAxisLabels:
ThisText = self.xAxisLabels[Index]
TextHeight = Visual.Fonts["NormalFont"].get_rect(ThisText)[3]
TextXPos = self.xPos + Index * xStep
TextYPos = self.yPos + self.yLen - TextHeight - Visual.Y_MARGIN
RenderText = Visual.Fonts["NormalFont"].render(ThisText, self.ColourBlack)
ThisSurface.blit(RenderText[0], (Visual.X_MARGIN + TextXPos, TextYPos))
pygame.draw.line(ThisSurface, self.ColourGrey, (TextXPos, self.yPos + Visual.Y_MARGIN), (TextXPos, self.yPos + self.yLen - 2*Visual.Y_MARGIN), 1)
# Plot all series.
DisplayTextOffset = 0
for Index in range(PLOT_COUNT):
# Display series description.
TextLabels = self.PidDescription[Index].split("|")
ThisText = "[" + str(Index+1) + "] " + self.PID[Index] + " " + TextLabels[ELM327.FIELD_PID_DESCRIPTION]
if len(TextLabels) > ELM327.FIELD_PID_FORMAT_1 and TextLabels[ELM327.FIELD_PID_FORMAT_1].find("f}") > -1:
ThisText += " " + TextLabels[ELM327.FIELD_PID_FORMAT_1].format(self.PlotPoints[Index][self.PlotIndex[Index] - 1])
TextHeight = Visual.Fonts["LargeFont"].get_rect(ThisText)[3]
TextXPos = Visual.X_MARGIN
TextYPos = DisplayTextOffset + Visual.Y_MARGIN + self.yPos
RenderText = Visual.Fonts["LargeFont"].render(ThisText, self.PlotAttrib[Index]["Colour"])
ThisSurface.blit(RenderText[0], (TextXPos, TextYPos))
DisplayTextOffset += TextHeight + Visual.Y_MARGIN
# Plot series scale.
yScale = (self.yLen - 2*Visual.Y_MARGIN) / (self.PlotAttrib[Index]["ValueMax"] - self.PlotAttrib[Index]["ValueMin"])
xStep = (self.xLen - 2*Visual.X_MARGIN) / PLOT_POINTS
# Display Y axis scale values.
for yOffset in range(0, yAxisScale - yAxisStep, yAxisStep):
ThisText = TextLabels[ELM327.FIELD_PID_FORMAT_1].format(yOffset / yScale + self.PlotAttrib[Index]["ValueMin"])
TextWidth = Visual.Fonts["NormalFont"].get_rect(ThisText)[2]
TextHeight = Visual.Fonts["NormalFont"].get_rect(ThisText)[3]
TextXPos = self.xPos + self.xLen - TextWidth - Visual.X_MARGIN
TextYPos = self.yPos + self.yLen - yOffset - (3 - Index) * (TextHeight + 2)
RenderText = Visual.Fonts["NormalFont"].render(ThisText, self.PlotAttrib[Index]["Colour"])
ThisSurface.blit(RenderText[0], (TextXPos, TextYPos))
# Plot series.
xOffset = 0
for PlotIndex in range(self.PlotIndex[Index] - 1):
PlotX1 = Visual.X_MARGIN + xOffset
PlotY1 = self.yPos + self.yLen - Visual.Y_MARGIN - yScale * (self.PlotPoints[Index][PlotIndex] - self.PlotAttrib[Index]["ValueMin"])
PlotX2 = Visual.X_MARGIN + xOffset + xStep
PlotY2 = self.yPos + self.yLen - Visual.Y_MARGIN - yScale * (self.PlotPoints[Index][PlotIndex+1] - self.PlotAttrib[Index]["ValueMin"])
pygame.draw.line(ThisSurface, self.PlotAttrib[Index]["Colour"], (PlotX1, PlotY1), (PlotX2, PlotY2), PLOT_WIDTH)
xOffset += xStep