Velocity¶
Example¶
#include <fstream>
#include "nlohmann/json.hpp"
#include "xleaflet/xmap.hpp"
#include "xleaflet/xvelocity.hpp"
auto map = xlf::map::initialize()
.center({0, 0})
.zoom(1)
.finalize();
auto base_layer = xlf::basemap({"CartoDB", "DarkMatter"});
map.add_layer(base_layer);
std::ifstream file("velocity_data.json");
nlohmann::json data;
file >> data;
auto velocity = xlf::velocity::initialize()
.data(data)
.velocity_scale(0.01)
.max_velocity(20)
.display_options(R"({
"velocityType": "Global Wind",
"displayPosition": "bottomleft",
"displayEmptyString": "No wind data"
})")
.finalize();
map.add_layer(velocity);
map
Attributes¶
Attribute |
Default Value |
Doc |
---|---|---|
data |
Null JSON objectdataset |
Underlying dataset |
units |
None |
Units |
display_values |
True |
Display velocity data on mouse hover |
display_options |
{} |
Display options |
min_velocity |
0.0 |
Used to align color scale |
max_velocity |
10.0 |
Used to align color scale |
velocity_scale |
0.005 |
Modifier for particle animations |
color_scale |
Empty std::vector of html colors |
Array of hex/rgb colors for user-specified color scale. |