hexagram/src/cluster.c

#include <stdlib.h>
#include <string.h>

#include <hexagram/cluster.h>

void hexagram_cluster_resize(hexagram_cluster *cluster,
                             double width,
                             double height) {
    /*
     * Ensure correct cluster aspect ratio
     */
    if (width / height > 32.0 / 15.0) {
        width = height * (32.0 / 15.0);
    } else {
        height = width * (15.0 / 32.0);
    }

    hexagram_tacho_init(&cluster->tacho,
                        width  * 0.2,
                        height * 0.5,
                        height * 0.4,
                        6500.0);

    hexagram_speedo_init(&cluster->speedo,
                         width  * 0.8,
                         height * 0.5,
                         height * 0.4);

    hexagram_thermo_init(&cluster->thermo,
                         width  * 0.43,
                         height * 0.76,
                         height * 0.13,
                         240.0);

    hexagram_fuel_init(&cluster->fuel,
                       width  * 0.57,
                       height * 0.76,
                       height * 0.13,
                       0.125);

    hexagram_mfd_init(&cluster->mfd,
                      width  * 0.42,
                      height * 0.10,
                      width  * 0.16,
                      height * 0.50);

    cluster->width  = width;
    cluster->height = height;
}

void hexagram_cluster_init(hexagram_cluster *cluster,
                           double width,
                           double height) {
    hexagram_cluster_resize(cluster, width, height);

    memset(&cluster->state, '\0', sizeof(cluster->state));
}

hexagram_cluster *hexagram_cluster_new(double width,
                                       double height) {
    hexagram_cluster *cluster;

    if ((cluster = malloc(sizeof(*cluster))) == NULL) {
        goto error_malloc_cluster;
    }

    hexagram_cluster_init(cluster, width, height);

    return cluster;

error_malloc_cluster:
    return NULL;
}

int hexagram_cluster_update(hexagram_cluster *cluster,
                            struct can_frame *frame) {
    switch (frame->can_id) {
        case 0x280: {
            cluster->state.rpm = 0.25 *
                (double)(frame->data[2] | (frame->data[3] << 8));

            return 1;
        }

        case 0x288: {
            cluster->state.temp = 0.75 * (double)(frame->data[4] - 48);

            return 1;
        }

        case 0x320: {
            cluster->state.fuel = (double)(frame->data[2] & 0xf) / 16.0;

            return 1;
        }

        case 0x5a0: {
            cluster->state.rps = 0.001 * (double)(frame->data[1]
                                               | (frame->data[2] << 8));

            return 1;
        }
    }

    return 0;
}

void hexagram_cluster_draw_bg(hexagram_cluster *cluster,
                              cairo_t *cr) {
    /*
     * Paint canvas black
     */
    cairo_set_source_rgb(cr, 0, 0, 0);
    cairo_paint(cr);

    hexagram_tacho_draw_face(&cluster->tacho, cr);
    hexagram_speedo_draw_face(&cluster->speedo, cr);
    hexagram_thermo_draw_face(&cluster->thermo, cr);
    hexagram_fuel_draw_face(&cluster->fuel, cr);
    hexagram_mfd_draw(&cluster->mfd, cr);
}

void hexagram_cluster_draw_fg(hexagram_cluster *cluster,
                              cairo_t *cr) {
    hexagram_tacho_draw_needle(&cluster->tacho, cr,
                               cluster->state.rpm);

    hexagram_speedo_draw_needle(&cluster->speedo, cr,
                                (2.00152 * cluster->state.rps * 3600) / 1000.0);

    hexagram_thermo_draw_needle(&cluster->thermo, cr,
                                cluster->state.temp);

    hexagram_fuel_draw_needle(&cluster->fuel, cr,
                              cluster->state.fuel);
}