jtheoof/swappy
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draw: ability to draw arrows

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This commit is contained in:
Jeremy Attali 2019-12-22 11:25:20 -05:00
parent 3a37418466
commit 279cd6d317
2 changed files with 47 additions and 1 deletions
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2
src/application.c
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@ -336,9 +336,9 @@ static void draw_area_motion_notify_handler(GtkWidget *widget,
}
break;
default:
// gdk_window_set_cursor(window, NULL);
return;
}
g_object_unref(crosshair);
}
static void apply_css(GtkWidget *widget, GtkStyleProvider *provider) {

46
src/draw.c
View File

@ -32,6 +32,47 @@ static void apply_output_transform(enum wl_output_transform transform,
*height = tmp;
}
}
static void draw_shape_arrow(cairo_t *cr, struct swappy_shape *shape) {
cairo_set_source_rgba(cr, 1, 0, 0, 1);
cairo_set_line_width(cr, 2);
cairo_move_to(cr, shape->from.x, shape->from.y);
cairo_line_to(cr, shape->to.x, shape->to.y);
cairo_stroke(cr);
cairo_fill(cr);
double r = 20;
double ta = 5 * M_PI / 6;
double xa = r * cos(ta);
double ya = r * sin(ta);
double tb = 7 * M_PI / 6;
double xb = r * cos(tb);
double yb = r * sin(tb);
double ftx = shape->to.x - shape->from.x;
double fty = shape->to.y - shape->from.y;
double ftz = sqrt(ftx * ftx + fty * fty);
if (ftz == 0) {
return;
}
double theta = atan(fty / ftx);
if (ftx < DBL_EPSILON) {
theta = M_PI + theta;
}
cairo_translate(cr, shape->to.x, shape->to.y);
cairo_rotate(cr, theta);
cairo_move_to(cr, 0, 0);
cairo_line_to(cr, xa, ya);
cairo_line_to(cr, xb, yb);
cairo_line_to(cr, 0, 0);
cairo_fill(cr);
}
static void draw_shape_ellipse(cairo_t *cr, struct swappy_shape *shape) {
double x = fabs(shape->from.x - shape->to.x);
double y = fabs(shape->from.y - shape->to.y);
@ -63,6 +104,7 @@ static void draw_shape_rectangle(cairo_t *cr, struct swappy_shape *shape) {
}
static void draw_shape(cairo_t *cr, struct swappy_shape *shape) {
cairo_save(cr);
switch (shape->type) {
case SWAPPY_PAINT_MODE_RECTANGLE:
draw_shape_rectangle(cr, shape);
@ -70,9 +112,13 @@ static void draw_shape(cairo_t *cr, struct swappy_shape *shape) {
case SWAPPY_PAINT_MODE_ELLIPSE:
draw_shape_ellipse(cr, shape);
break;
case SWAPPY_PAINT_MODE_ARROW:
draw_shape_arrow(cr, shape);
break;
default:
g_debug("unknown shape type: %d", shape->type);
}
cairo_restore(cr);
}
static void draw_shapes(cairo_t *cr, struct swappy_state *state) {