92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
#include <stdlib.h>
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#include <math.h>
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#include <hexagram/gauge.h>
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void hexagram_gauge_init(hexagram_gauge *gauge,
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double x,
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double y,
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double radius,
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double min_angle,
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double max_angle) {
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gauge->x = x;
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gauge->y = y;
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gauge->radius = radius;
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gauge->min_angle = min_angle;
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gauge->max_angle = max_angle;
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}
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void hexagram_gauge_draw_number(hexagram_gauge *gauge,
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cairo_t *cr,
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double radius,
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double value,
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const char *text) {
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double angle = gauge->min_angle
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+ ((gauge->max_angle - gauge->min_angle) * value) - 1.658;
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/*
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* Draw the gauge pivot
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*/
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cairo_set_source_rgb(cr, 1, 1, 1);
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cairo_arc(cr,
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gauge->x,
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gauge->y,
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gauge->radius * 0.08,
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0,
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2.0 * M_PI);
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cairo_stroke(cr);
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/*
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* Draw the needle atop the gauge pivot
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*/
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cairo_set_source_rgb(cr, 1, 1, 1);
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cairo_move_to(cr,
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gauge->x + (radius * gauge->radius) * cos(angle),
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gauge->y + (radius * gauge->radius) * sin(angle));
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cairo_save(cr);
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cairo_rotate(cr, angle + 1.658);
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cairo_show_text(cr, text);
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cairo_stroke(cr);
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cairo_restore(cr);
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}
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void hexagram_gauge_draw_mark(hexagram_gauge *gauge,
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cairo_t *cr,
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double min_radius,
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double max_radius,
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double value) {
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double angle = gauge->min_angle
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+ ((gauge->max_angle - gauge->min_angle) * value) - (M_PI / 2.0);
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cairo_move_to(cr,
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gauge->x + (min_radius * gauge->radius) * cos(angle),
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gauge->y + (min_radius * gauge->radius) * sin(angle));
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cairo_line_to(cr,
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gauge->x + (max_radius * gauge->radius) * cos(angle),
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gauge->y + (max_radius * gauge->radius) * sin(angle));
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cairo_stroke(cr);
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}
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void hexagram_gauge_draw_needle(hexagram_gauge *gauge,
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cairo_t *cr,
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double radius,
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double value) {
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double angle = gauge->min_angle
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+ ((gauge->max_angle - gauge->min_angle) * value) - (M_PI / 2.0);
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cairo_move_to(cr, gauge->x, gauge->y);
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cairo_set_source_rgb(cr, 0, 0.25, 1.0);
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cairo_line_to(cr,
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gauge->x + (radius * gauge->radius) * cos(angle),
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gauge->y + (radius * gauge->radius) * sin(angle));
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cairo_stroke(cr);
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}
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