Display SSD1306 for ESP32
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class Graph{ //ContentType (1)
private:
String title;
char graphType; //'a' Vertical Bar, 'b' Horizontal Bar, 'c' Cartesian Graph
//Assign whatever value in "configure(..." if a parameter is not required for the specified graphType
double value; //For: Vertical Bar Horizontal Bar Cartesian
double xpos; //For: Vertical Bar Horizontal Bar Cartesian
double ypos; //For: Vertical Bar Horizontal Bar Cartesian
double height; //For: Vertical Bar Horizontal Bar Cartesian
double width; //For: Vertical Bar Horizontal Bar Cartesian
double yminimum; //For: Vertical Bar Cartesian
double ymaximum; //For: Vertical Bar Cartesian
double xminimum; //For: Horizontal Bar Cartesian
double xmaximum; //For: Horizontal Bar Cartesian
double yStepSize; //For: Vertical Bar Cartesian
double xStepSize; //For: Horizontal Bar Cartesian
int digit; //For: Vertical Bar Horizontal Bar Cartesian
int * maximum;
double x;
double yrange;
double xrange;
double ox;
double oy;
double count;
double graphScale;
bool redraw = true;
int previousScreen = 0;
int previousContentType = 0;
public:
//This method configures the graph created, defines its parameters according the type of graph selected.
void configure(String title, char graphType, double xpos, double ypos, double width, double height,
double yminimum, double ymaximum, double xminimum, double xmaximum, double yStepSize, double xStepSize, int digit, void *maximum){
this->title = title;
this->graphType = graphType;
this->yminimum = yminimum;
this->ymaximum = ymaximum;
this->xminimum = xminimum;
this->count = xminimum;
this->xmaximum = xmaximum;
this->height = height;
this->width = width;
this->yStepSize = yStepSize;
this->xStepSize = xStepSize;
this->digit = digit;
this->xpos = xpos;
this->ypos = ypos;
this->maximum = (int *) maximum;
switch(graphType){
case 'a':
this->yrange = ymaximum - yminimum;
this->graphScale = (yStepSize) * (height / this->yrange) - .001; //Adjusts the scale of the graph, according to the range and the size of the step
break;
case 'b':
this->xrange = xmaximum - xminimum;
this->graphScale = (xStepSize) * (width / this->xrange) - .001; //Adjusts the scale of the graph, according to the range and the size of the step
break;
case 'c':
this->yrange = ymaximum - yminimum;
break;
}
}
void drawGraph(){
double level, data, i;
switch(graphType){
case 'a':
double my;
if (this->redraw) { //Prints the labels
display.clearDisplay();
this->redraw = false;
display.fillRect(0, 0, 127 , 14, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(this->title);
for (i = 0; i <= this->height; i += this->graphScale) {
my = this->ypos - this->height + i;
display.drawFastHLine(this->xpos + this->width + 1, my, 5, SSD1306_WHITE);
// draw lables
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
display.setCursor(this->xpos + this->width + 12, my - 3 );
data = this->ymaximum - ( i * (this->yStepSize / this->graphScale));
display.print(data, this->digit);
}
}
// compute level of bar graph that is scaled to the height and the hi and low vals
// this is needed to accompdate for +/- range
level = (this->height * (((this->value - this->yminimum) / (this->yrange))));
// draw the bar graph
// write a upper and lower bar to minimize flicker cause by blanking out bar and redraw on update
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - this->height, this->width, this->height - level, SSD1306_BLACK);
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - level, this->width, level, SSD1306_WHITE);
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
break;
case 'b':
if (this->redraw) {
display.clearDisplay();
this->redraw = false;
display.fillRect(0, 0, 127 , 16, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(this->title);
// draw the text
for (i = 0; i <= this->width; i += this->graphScale) {
display.drawFastVLine(i + this->xpos , this->ypos , 5, SSD1306_WHITE);
// draw lables
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
display.setCursor(i + this->xpos , this->ypos + 10);
// addling a small value to eliminate round off errors
// this val may need to be adjusted
data = ( i * (this->xStepSize / this->graphScale)) + this->xminimum + 0.00001;
display.print(data, this->digit);
}
}
// compute level of bar graph that is scaled to the width and the hi and low vals
// this is needed to accompdate for +/- range capability
// draw the bar graph
// write a upper and lower bar to minimize flicker cause by blanking out bar and redraw on update
level = (this->width * (((this->value - this->xminimum) / (this->xmaximum - this->xminimum))));
display.fillRect(this->xpos + level, this->ypos - this->height, this->width - level, this->height, SSD1306_BLACK);
display.drawRect(this->xpos, this->ypos - this->height, this->width, this->height, SSD1306_WHITE);
display.fillRect(this->xpos, this->ypos - this->height, level, this->height, SSD1306_WHITE);
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
break;
case 'c':
double temp;
if (this->redraw == true) {
this->redraw = false;
this->xrange = *this->maximum - xminimum;
display.clearDisplay();
display.fillRect(0, 0, 127 , 16, SSD1306_WHITE);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.setTextSize(1);
display.setCursor(2, 4);
display.println(title);
this->ox = (this->count - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
this->oy = (this->value - this->yminimum) * (- this->height) / (this->yrange) + this->ypos;
// draw y scale
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
for ( i = this->yminimum; i <= this->ymaximum; i += this->yStepSize) {
// compute the transform
// note my transform funcition is the same as the map function, except the map uses long and we need doubles
temp = (i - this->yminimum) * (- this->height) / (this->ymaximum - this->yminimum) + this->ypos;
if (i == 0) {
display.drawFastHLine(this->xpos - 3, temp, this->width + 3, SSD1306_WHITE);
}
else {
display.drawFastHLine(this->xpos - 3, temp, 3, SSD1306_WHITE);
}
display.setCursor(this->xpos - 27, temp - 3);
display.println(i, this->digit);
}
// draw x scale
for (i = this->xminimum; i <= *this->maximum; i += this->xStepSize) {
// compute the transform
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
temp = (i - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
if (i == 0) {
display.drawFastVLine(temp, this->ypos - this->height, this->height + 3, SSD1306_WHITE);
}
else {
display.drawFastVLine(temp, this->ypos, 3, SSD1306_WHITE);
}
display.setCursor(temp, this->ypos + 6);
display.println(i, this->digit);
}
}
// graph drawn now plot the data
// the entire plotting code are these few lines...
this->x = (this->count - this->xminimum) * (this->width) / (this->xrange) + this->xpos;
this->value = (this->value - this->yminimum) * (- this->height) / (this->yrange) + this->ypos;
display.drawLine(this->ox, this->oy, this->x, this->value, SSD1306_WHITE);
display.drawLine(this->ox, this->oy - 1, this->x, this->value - 1, SSD1306_WHITE);
this->ox = this->x;
this->oy = this->value;
// up until now print sends data to a video buffer NOT the screen
// this call sends the data to the screen
display.display();
this->count += 1;
if(this->ox >= (this->xpos + this->width)){
this->redraw = true;
this->count = xminimum;
}
}
}
void redrawFlag(){ // Activates the redraw bool to get the graph printed correctly
this->redraw = true;
this->count = xminimum;
}
void setPreviousScreen(int prev){
this->previousScreen = prev;
}
void setPreviousContentType(int prev){
this->previousContentType = prev;
}
int getPreviousScreen(){
int prev = this->previousScreen;
return prev;
}
int getPreviousContentType(){
int prev = this->previousContentType;
return prev;
}
void assignValue(double value){
this->value = value;
}
void reset(){
this->x = 0;
}
};