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light.c
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light.c
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "YggInterface.h"
double calc_light_intensity(double ambient_light,
double x1, double y1, double z1,
double x2, double y2, double z2,
double x3, double y3, double z3) {
double a = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
double b = sqrt(pow(x3 - x2, 2) + pow(y3 - y2, 2));
double c = sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2));
double s = (a + b + c)/2.0;
double A = sqrt(s*(s - a)*(s - b)*(s - c));
return ambient_light * A * (10.0 - (z1 + z2 + z3)/3.0)/10.0;
}
int main(int argc,char *argv[]) {
int i, ret, return_code = 0;
yggInput_t AmbInput = yggAsciiTableInput("ambient_light");
yggInput_t StructInput = yggAsciiArrayInput("canopy_structure");
yggOutput_t LightOutput = yggAsciiTableOutput("light_intensity", "%lf\n");
// Receive Ambient light
double ambient_light;
ret = yggRecv(AmbInput, &ambient_light);
if (ret < 0) {
printf("light: Error receiving ambient light.\n");
return -1;
}
printf("light: ambient light = %f\n", ambient_light);
// Malloc arrays for use
double **x1 = (double**)malloc(3*sizeof(double*));
double **x2 = (double**)malloc(3*sizeof(double*));
double **x3 = (double**)malloc(3*sizeof(double*));
for (i = 0; i < 3; i++) {
x1[i] = NULL;
x2[i] = NULL;
x3[i] = NULL;
}
// Loop over canopy structures
size_t npatch = 0;
double light_intensity = 0.0;
ret = 0;
while (1) {
ret = yggRecv(StructInput, &npatch,
&x1[0], &x1[1], &x1[2],
&x2[0], &x2[1], &x2[2],
&x3[0], &x3[1], &x3[2]);
if (ret < 0) {
printf("light: End of input.\n");
break;
}
for (i = 0; i < (int)npatch; i++) {
light_intensity = calc_light_intensity(ambient_light,
x1[0][i], x1[1][i], x1[2][i],
x2[0][i], x2[1][i], x2[2][i],
x3[0][i], x3[1][i], x3[2][i]);
printf("light: structure = \t%f\t%f\t%f --> light_intensity = %f\n\t\t\t%f\t%f\t%f\n\t\t\t%f\t%f\t%f\n",
x1[0][i], x1[1][i], x1[2][i], light_intensity,
x2[0][i], x2[1][i], x2[2][i],
x3[0][i], x3[1][i], x3[2][i]);
ret = yggSend(LightOutput, light_intensity);
if (ret < 0) {
printf("light: Error sending light intensity output.\n");
return_code = -1;
break;
}
}
if (ret < 0)
break;
}
for (i = 0; i < 3; i++) {
if (x1[i] != NULL) free(x1[i]);
if (x2[i] != NULL) free(x2[i]);
if (x3[i] != NULL) free(x3[i]);
}
free(x1);
free(x2);
free(x3);
return return_code;
}