#include "chartdir.h"
void createChart(int chartIndex, const char *filename)
{
// The value to display on the meter
double value = 66;
// The background and border colors of the meters
int bgColor[] = {0x88ccff, 0xffdddd};
int borderColor[] = {0x000077, 0x880000};
// Create an AngularMeter object of size 300 x 200 pixels with transparent background
AngularMeter *m = new AngularMeter(300, 200, Chart::Transparent);
// Center at (150, 150), scale radius = 124 pixels, scale angle -90 to +90 degrees
m->setMeter(150, 150, 124, -90, 90);
// Background gradient color with brighter color at the center
double bgGradient[] = {0, m->adjustBrightness(bgColor[chartIndex], 3), 0.75, bgColor[chartIndex]
};
// Add a scale background of 148 pixels radius using the background gradient, with a 13 pixel
// thick border
m->addScaleBackground(148, m->relativeRadialGradient(DoubleArray(bgGradient, (int)(sizeof(
bgGradient) / sizeof(bgGradient[0])))), 13, borderColor[chartIndex]);
// Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and micro
// tick every 5 units
m->setScale(0, 100, 20, 10, 5);
// Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
// 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
m->setLabelStyle("ariali.ttf", 16);
m->setTickLength(-16, -16, -10);
m->setLineWidth(0, 2, 1, 1);
// Demostrate different types of color scales and putting them at different positions
double smoothColorScale[] = {0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
0xff0000};
if (chartIndex == 0) {
// Add the smooth color scale at the default position
m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
smoothColorScale[0]))));
// Add a red (0xff0000) triangular pointer starting from 38% and ending at 60% of scale
// radius, with a width 6 times the default
m->addPointer2(value, 0xff0000, -1, Chart::TriangularPointer2, 0.38, 0.6, 6);
} else {
// Add the smooth color scale starting at radius 124 with zero width and ending at radius
// 124 with 16 pixels inner width
m->addColorScale(DoubleArray(smoothColorScale, (int)(sizeof(smoothColorScale) / sizeof(
smoothColorScale[0]))), 124, 0, 124, -16);
// Add a red (0xff0000) pointer
m->addPointer2(value, 0xff0000);
}
// Configure a large "pointer cap" to be used as the readout circle at the center. The cap
// radius and border width is set to 33% and 4% of the meter scale radius. The cap color is dark
// blue (0x000044). The border color is light blue (0x66bbff) with a 60% brightness gradient
// effect.
m->setCap2(Chart::Transparent, 0x000044, 0x66bbff, 0.6, 0, 0.33, 0.04);
// Add value label at the center with light blue (0x66ddff) 28pt Arial Italic font
m->addText(150, 150, m->formatValue(value, "{value|0}"), "ariali.ttf", 28, 0x66ddff,
Chart::Center)->setMargin(0);
// Output the chart
m->makeChart(filename);
//free up resources
delete m;
}
int main(int argc, char *argv[])
{
createChart(0, "semicirclemeterreadout0.png");
createChart(1, "semicirclemeterreadout1.png");
return 0;
} |