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Adjust chart axis labelling for better intervals

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This commit is contained in:
Ulrich Meine
2026-05-21 23:00:24 +02:00
parent 92a6266d71
commit 1425297ef4
2 changed files with 38 additions and 44 deletions
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lib/obp60task/OBPcharts.cpp
+37 -43
View File
@@ -3,11 +3,13 @@
#include "OBPDataOperations.h"
#include "OBPRingBuffer.h"
// Default ranges for various boat data types: 1st value default range, 2nd value step for range adjustment
// should be multiple of 4 for full integer chart labels w/o decimals
std::map<String, ChartProps> Chart::dfltChrtDta = {
{ "formatWind", { 60.0 * DEG_TO_RAD, 10.0 * DEG_TO_RAD } }, // default course range 60 degrees
{ "formatWind", { 60.0 * DEG_TO_RAD, 10.0 * DEG_TO_RAD } }, // default wind range 60 degrees
{ "formatCourse", { 60.0 * DEG_TO_RAD, 10.0 * DEG_TO_RAD } }, // default course range 60 degrees
{ "formatKnots", { 2.57, 2.57 } }, // default speed range in m/s
{ "formatDepth", { 10.0, 5.0 } }, // default depth range in m
{ "formatDepth", { 15.0, 5.0 } }, // default depth range in m
{ "kelvinToC", { 20.0, 5.0 } } // default temp range in °C/K
};
@@ -80,8 +82,8 @@ Chart::Chart(RingBuffer<uint16_t>& dataBuf, double dfltRng, CommonData& common,
dfltRng = dfltChrtDta[dbFormat].range;
rngStep = dfltChrtDta[dbFormat].step;
} else {
dfltRng = 15.0;
rngStep = 5.0;
dfltRng = 16.0;
rngStep = 4.0;
}
// Initialize chart range values
@@ -538,6 +540,7 @@ void Chart::drawChrtValAxis(const char chrtDir, const int8_t chrtSz, bool prntNa
}
// for any other data formats print multiple axis value lines on full charts
font = &Ubuntu_Bold10pt8b;
prntHorizChartMultiValueAxisLabel(font);
return;
@@ -561,12 +564,9 @@ void Chart::drawChrtValAxis(const char chrtDir, const int8_t chrtSz, bool prntNa
font = &Ubuntu_Bold12pt8b;
getdisplay().setFont(font); // use larger font
drawTextRalign(cRoot.x + (valAxis * 0.42), cRoot.y - 2, dbName.substring(0, 6)); // print buffer data name (max. size 5 characters)
} else {
font = &Ubuntu_Bold10pt8b;
}
font = &Ubuntu_Bold10pt8b;
prntVerticChartThreeValueAxisLabel(font);
}
}
@@ -689,13 +689,13 @@ void Chart::prntHorizChartThreeValueAxisLabel(const GFXfont* font)
double axLabel;
double chrtMin, chrtMid, chrtMax;
int xOffset, yOffset; // offset for text position of x axis label for different font sizes
String sVal;
char sVal[11];
if (font == &Ubuntu_Bold10pt8b) {
xOffset = 39;
xOffset = 32;
yOffset = 16;
} else if (font == &Ubuntu_Bold12pt8b) {
xOffset = 51;
xOffset = 42;
yOffset = 18;
}
getdisplay().setFont(font);
@@ -704,26 +704,23 @@ void Chart::prntHorizChartThreeValueAxisLabel(const GFXfont* font)
chrtMin = convertValue(this->chrtMin, dbName, dbFormat, *commonData);
chrtMid = convertValue(this->chrtMid, dbName, dbFormat, *commonData);
chrtMax = convertValue(this->chrtMax, dbName, dbFormat, *commonData);
chrtMin = std::round(chrtMin * 100.0) / 100.0;
chrtMid = std::round(chrtMid * 100.0) / 100.0;
chrtMax = std::round(chrtMax * 100.0) / 100.0;
// print top axis label
axLabel = (chrtDataFmt == SPEED || chrtDataFmt == TEMPERATURE) ? chrtMax : chrtMin;
sVal = formatLabel(axLabel);
snprintf(sVal, sizeof(sVal), "%3.0f", axLabel);
getdisplay().fillRect(cRoot.x, cRoot.y + 2, xOffset + 3, yOffset, bgColor); // Clear small area to remove potential chart lines
drawTextRalign(cRoot.x + xOffset, cRoot.y + yOffset, sVal); // range value
// print mid axis label
axLabel = chrtMid;
sVal = formatLabel(axLabel);
formatLabel(axLabel).toCharArray(sVal, 11); // print mid label with 1 decimal for small numbers, if required
getdisplay().fillRect(cRoot.x, cRoot.y + (valAxis / 2) - 8, xOffset + 3, 16, bgColor); // Clear small area to remove potential chart lines
drawTextRalign(cRoot.x + xOffset, cRoot.y + (valAxis / 2) + 6, sVal); // range value
getdisplay().drawLine(cRoot.x + xOffset + 3, cRoot.y + (valAxis / 2), cRoot.x + timAxis, cRoot.y + (valAxis / 2), fgColor);
// print bottom axis label
axLabel = (chrtDataFmt == SPEED || chrtDataFmt == TEMPERATURE) ? chrtMin : chrtMax;
sVal = formatLabel(axLabel);
snprintf(sVal, sizeof(sVal), "%3.0f", axLabel);
getdisplay().fillRect(cRoot.x, cRoot.y + valAxis - 14, xOffset + 3, 15, bgColor); // Clear small area to remove potential chart lines
drawTextRalign(cRoot.x + xOffset, cRoot.y + valAxis, sVal); // range value
getdisplay().drawLine(cRoot.x + xOffset + 3, cRoot.y + valAxis, cRoot.x + timAxis, cRoot.y + valAxis, fgColor);
@@ -733,45 +730,43 @@ void Chart::prntHorizChartThreeValueAxisLabel(const GFXfont* font)
void Chart::prntHorizChartMultiValueAxisLabel(const GFXfont* font)
{
double chrtMin, chrtMax, chrtRng;
double axSlots, axIntv, axLabel;
// int axSlots = 5; // no. of axis labels
int xOffset; // offset for text position of x axis label for different font sizes
String sVal;
char sVal[11];
if (font == &Ubuntu_Bold10pt8b) {
xOffset = 38;
xOffset = 32;
} else if (font == &Ubuntu_Bold12pt8b) {
xOffset = 50;
xOffset = 42;
}
getdisplay().setFont(font);
chrtMin = convertValue(this->chrtMin, dbName, dbFormat, *commonData);
// chrtMin = std::floor(chrtMin / rngStep) * rngStep;
chrtMin = std::round(chrtMin * 100.0) / 100.0;
chrtMax = convertValue(this->chrtMax, dbName, dbFormat, *commonData);
// chrtMax = std::ceil(chrtMax / rngStep) * rngStep;
chrtMax = std::round(chrtMax * 100.0) / 100.0;
chrtRng = std::round((chrtMax - chrtMin) * 100) / 100;
chrtRng = chrtMax - chrtMin;
axSlots = valAxis / static_cast<double>(VALAXIS_STEP); // number of axis labels (and we want to have a double calculation, no integer)
axIntv = chrtRng / axSlots;
axLabel = chrtMin + axIntv;
// LOG_DEBUG(GwLog::DEBUG, "Chart::printHorizMultiValueAxisLabel: chrtRng: %.2f, th-chrtRng: %.2f, axSlots: %.2f, axIntv: %.2f, axLabel: %.2f, chrtMin: %.2f, chrtMid: %.2f, chrtMax: %.2f", chrtRng, this->chrtRng, axSlots, axIntv, axLabel, this->chrtMin, chrtMid, chrtMax);
double axIntv = chrtRng / VALAXIS_SLOTS; // axis label interval
double axLabel = chrtMin + axIntv; // current axis label
double chrtScale = double(valAxis) / chrtRng; // Chart scale: pixels per value step
double valAxisStep = axIntv * chrtScale; // pixel per axis label interval
// LOG_DEBUG(GwLog::DEBUG, "Chart::printHorizMultiValueAxisLabel: chrtRng: %.2f, th-chrtRng: %.2f, axSlots: %.2f, axIntv: %.2f, axLabel: %.2f, chrtMin: %.2f, chrtMid: %.2f, chrtMax: %.2f", chrtRng, this->chrtRng, VALAXIS_SLOTS, axIntv, axLabel, this->chrtMin, chrtMid, chrtMax);
int loopStrt, loopEnd, loopStp;
if (chrtDataFmt == SPEED || chrtDataFmt == TEMPERATURE || chrtDataFmt == OTHER) {
// High value at top
loopStrt = valAxis - VALAXIS_STEP;
loopEnd = VALAXIS_STEP / 2;
loopStp = VALAXIS_STEP * -1;
loopStrt = valAxis - valAxisStep;
loopEnd = valAxisStep / 2;
loopStp = valAxisStep * -1;
} else {
// Low value at top
loopStrt = VALAXIS_STEP;
loopEnd = valAxis - (VALAXIS_STEP / 2);
loopStp = VALAXIS_STEP;
loopStrt = valAxisStep;
loopEnd = valAxis - (valAxisStep / 2);
loopStp = valAxisStep;
}
for (int j = loopStrt; (loopStp > 0) ? (j < loopEnd) : (j > loopEnd); j += loopStp) {
sVal = formatLabel(axLabel);
// sVal = formatLabel(axLabel);
snprintf(sVal, sizeof(sVal), "%3.0f", axLabel);
getdisplay().fillRect(cRoot.x, cRoot.y + j - 11, xOffset + 3, 21, bgColor); // Clear small area to remove potential chart lines
drawTextRalign(cRoot.x + xOffset, cRoot.y + j + 7, sVal); // range value
getdisplay().drawLine(cRoot.x + xOffset + 3, cRoot.y + j, cRoot.x + timAxis, cRoot.y + j, fgColor);
@@ -821,16 +816,15 @@ String Chart::formatLabel(const double& label)
// Format 3 numbers with prefix zero
snprintf(sVal, sizeof(sVal), "%03.0f", label);
} else if (dbFormat == "formatRot") {
/* } else if (dbFormat == "formatRot") {
if (label > -10 && label < 10) {
snprintf(sVal, sizeof(sVal), "%3.2f", label);
} else {
snprintf(sVal, sizeof(sVal), "%3.0f", label);
}
}
} */
else {
if (label < 10) {
} else {
if (label < 9.95) {
snprintf(sVal, sizeof(sVal), "%3.1f", label);
} else {
snprintf(sVal, sizeof(sVal), "%3.0f", label);
lib/obp60task/OBPcharts.h
+1 -1
View File
@@ -40,7 +40,7 @@ protected:
static constexpr int8_t MIN_FREE_VALUES = 60; // free 60 values when chart line reaches chart end
static constexpr int8_t THRESHOLD_NO_DATA = 3; // max. seconds of invalid values in a row
static constexpr int8_t VALAXIS_STEP = 60; // pixels between two chart value axis labels
static constexpr int8_t VALAXIS_SLOTS = 5; // no. of value axis labels
static constexpr bool NO_SIMUDATA = true; // switch off simulation feature of <formatValue> function