int main(int argc, char *argv[])
{
// The value to display on the meter
double value = 85;
// Create an LinearMeter object of size 210 x 45 pixels, using silver background
// with a 2 pixel black 3D depressed border.
LinearMeter *m = new LinearMeter(210, 45, Chart::silverColor(), 0, -2);
// Set the scale region top-left corner at (5, 5), with size of 200 x 20 pixels.
// The scale labels are located on the bottom (implies horizontal meter)
m->setMeter(5, 5, 200, 20, Chart::Bottom);
// Set meter scale from 0 - 100
m->setScale(0, 100);
// Add a title at the bottom of the meter with a 1 pixel raised 3D border
m->addTitle(Chart::Bottom, "Battery Level", "arialbd.ttf", 8)->setBackground(
Chart::Transparent, -1, 1);
// Set 3 zones of different colors to represent Good/Weak/Bad data ranges
m->addZone(50, 100, 0x99ff99, "Good");
m->addZone(20, 50, 0xffff66, "Weak");
m->addZone(0, 20, 0xffcccc, "Bad");
// Add empty labels (just need the ticks) at 0/20/50/80 as separators for zones
m->addLabel(0, " ");
m->addLabel(20, " ");
m->addLabel(50, " ");
m->addLabel(100, " ");
// Add a semi-transparent blue (800000ff) pointer at the specified value, using
// triangular pointer shape
m->addPointer(value, 0x800000FF)->setShape(Chart::TriangularPointer);
// output the chart
m->makeChart("linearzonemeter.png");
//free up resources
delete m;
return 0;
}
void createChart(int chartIndex, const char *filename)
{
// The value to display on the meter
double value = 74.25;
// Create a LinearMeter object of size 70 x 260 pixels with very light grey (0xeeeeee)
// backgruond and a grey (0xbbbbbb) 3-pixel thick rounded frame
LinearMeter *m = new LinearMeter(70, 260, 0xeeeeee, 0xbbbbbb);
m->setRoundedFrame(Chart::Transparent);
m->setThickFrame(3);
// Set the scale region top-left corner at (28, 33), with size of 20 x 194 pixels. The scale
// labels are located on the left (default - implies vertical meter).
m->setMeter(28, 33, 20, 194);
// Set meter scale from 0 - 100, with a tick every 10 units
m->setScale(0, 100, 10);
// Demostrate different types of color scales
double smoothColorScale[] = {0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
0xff0000};
double stepColorScale[] = {0, 0x00dd00, 50, 0xffff00, 80, 0xff0000, 100};
double highColorScale[] = {70, Chart::Transparent, 100, 0xff0000};
double lowColorScale[] = {0, 0x0000ff, 30, Chart::Transparent};
if (chartIndex == 0) {
// Add a blue (0x0088ff) bar from 0 to value with glass effect and 4 pixel rounded corners
m->addBar(0, value, 0x0088ff, Chart::glassEffect(Chart::NormalGlare, Chart::Left), 4);
// Add a 6-pixel thick smooth color scale at x = 53 (right of meter scale)
m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
smoothColorScale[0]))), 53, 6);
} else if (chartIndex == 1) {
// Add a green (0x00cc00) bar from 0 to value with bar lighting effect and 4 pixel rounded
// corners
m->addBar(0, value, 0x00cc00, Chart::barLighting(), 4);
// Add a high only color scale at x = 52 (right of meter scale) with thickness varying from
// 0 to 8
m->addColorScale(DoubleArray(highColorScale, (int)(sizeof(highColorScale) / sizeof(
highColorScale[0]))), 52, 0, 52, 8);
// Add a low only color scale at x = 52 (right of meter scale) with thickness varying from 8
// to 0
m->addColorScale(DoubleArray(lowColorScale, (int)(sizeof(lowColorScale) / sizeof(
lowColorScale[0]))), 52, 8, 52, 0);
} else if (chartIndex == 2) {
// Add a purple (0x0088ff) bar from 0 to value with glass effect and 4 pixel rounded corners
m->addBar(0, value, 0x8833dd, Chart::glassEffect(Chart::NormalGlare, Chart::Left), 4);
// Add a high only color scale at x = 52 (right of meter scale) with thickness varying from
// 0 to 8
m->addColorScale(DoubleArray(highColorScale, (int)(sizeof(highColorScale) / sizeof(
highColorScale[0]))), 52, 0, 52, 8);
} else if (chartIndex == 3) {
// Add a orange (0xff8800) bar from 0 to value with cylinder lighting effect
m->addBar(0, value, 0xff8800, Chart::cylinderEffect());
// Add a high only color scale at x = 53 (right of meter scale)
m->addColorScale(DoubleArray(highColorScale, (int)(sizeof(highColorScale) / sizeof(
highColorScale[0]))), 53, 6);
} else if (chartIndex == 4) {
// Add a red (0xee3333) bar from 0 to value with glass effect and 4 pixel rounded corners
m->addBar(0, value, 0xee3333, Chart::glassEffect(Chart::NormalGlare, Chart::Left), 4);
// Add a step color scale at x = 53 (right of meter scale)
m->addColorScale(DoubleArray(stepColorScale, (int)(sizeof(stepColorScale) / sizeof(
stepColorScale[0]))), 53, 6);
} else {
// Add a grey (0xaaaaaa) bar from 0 to value
m->addBar(0, value, 0xaaaaaa);
// Add a smooth color scale at x = 52 (right of meter scale) with thickness varying from 0
// to 8
m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
smoothColorScale[0]))), 52, 0, 52, 8);
}
// Add a title using 8pt Arial Bold font with grey (0xbbbbbb) background
m->addTitle("Temp C", "arialbd.ttf", 8, Chart::TextColor)->setBackground(0xbbbbbb);
// Add a text box at the bottom-center. Display the value using white (0xffffff) 8pt Arial Bold
// font on a black (0x000000) background with rounded border.
TextBox *t = m->addText(m->getWidth() / 2, m->getHeight() - 8, m->formatValue(value, "2"),
"arialbd.ttf", 8, 0xffffff, Chart::Bottom);
t->setBackground(0x000000);
t->setRoundedCorners(3);
t->setMargin(5, 5, 2, 1);
// Output the chart
m->makeChart(filename);
//free up resources
delete m;
}