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fix(render): properly scale arrow along with stroke size

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This commit is contained in:
Jeremy Attali 2019-12-27 15:25:04 -05:00
parent 5930c99b9e
commit 75bfc10fb7
1 changed files with 32 additions and 16 deletions
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48
src/render.c
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@ -35,40 +35,56 @@ static void render_shape_arrow(cairo_t *cr, struct swappy_paint_shape shape) {
cairo_set_source_rgba(cr, shape.r, shape.g, shape.b, shape.a);
cairo_set_line_width(cr, shape.w);
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);
double ftn = sqrt(ftx * ftx + fty * fty);
if (ftz == 0) {
double r = 20;
double scaling_factor = shape.w / 4;
double alpha = M_PI / 6;
double ta = 5 * alpha;
double tb = 7 * alpha;
double xa = r * cos(ta);
double ya = r * sin(ta);
double xb = r * cos(tb);
double yb = r * sin(tb);
double xc = ftn - fabs(xa) * scaling_factor;
if (xc < DBL_EPSILON) {
xc = 0;
}
if (ftn < DBL_EPSILON) {
return;
}
double theta = atan(fty / ftx);
if (ftx < DBL_EPSILON) {
theta = M_PI + theta;
}
// Draw line
cairo_save(cr);
cairo_translate(cr, shape.from.x, shape.from.y);
cairo_rotate(cr, theta);
cairo_move_to(cr, 0, 0);
cairo_line_to(cr, xc, 0);
cairo_stroke(cr);
cairo_restore(cr);
// Draw arrow
cairo_save(cr);
cairo_translate(cr, shape.to.x, shape.to.y);
cairo_rotate(cr, theta);
cairo_scale(cr, scaling_factor, scaling_factor);
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);
cairo_restore(cr);
}
static void render_shape_ellipse(cairo_t *cr, struct swappy_paint_shape shape) {