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sammycage / plutovg

Tiny 2D vector graphics library in C

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test arc failed

scriptiot-dev opened this issue · comments

commented 
static void test_arc(const char * filename)
{
    plutovg_surface_t * surface = plutovg_surface_create(256, 256);
    plutovg_t * ctx = plutovg_create(surface);

    double xc = 128.0;
    double yc = 128.0;
    double radius = 100.0;
    double angle1 = 45.0 * (M_PI / 180.0);
    double angle2 = 180.0 * (M_PI / 180.0);

    plutovg_set_line_width(ctx, 10.0);
    plutovg_arc(ctx, xc, yc, radius, angle1, angle2, 0);
    plutovg_stroke(ctx);

    plutovg_set_source_rgba(ctx, 1, 0.2, 0.2, 0.6);
    plutovg_set_line_width(ctx, 6.0);

    plutovg_arc(ctx, xc, yc, 10.0, 0, 2 * M_PI, 0);
    plutovg_fill(ctx);

    plutovg_arc(ctx, xc, yc, radius, angle1, angle1, 0);
    plutovg_line_to(ctx, xc, yc);
    plutovg_arc(ctx, xc, yc, radius, angle2, angle2, 0);
    plutovg_line_to(ctx, xc, yc);
    plutovg_stroke(ctx);

    plutovg_surface_write_to_png(surface, filename);
    plutovg_destroy(ctx);
    plutovg_surface_destroy(surface);
}


static void test_arc_negative(const char * filename)
{
    plutovg_surface_t * surface = plutovg_surface_create(256, 256);
    plutovg_t * ctx = plutovg_create(surface);

    double xc = 128.0;
    double yc = 128.0;
    double radius = 100.0;
    double angle1 = 45.0 * (M_PI / 180.0);
    double angle2 = 180.0 * (M_PI / 180.0);

    plutovg_set_line_width(ctx, 10.0);
    plutovg_arc(ctx, xc, yc, radius, angle1, angle2, 1);
    plutovg_stroke(ctx);

    plutovg_set_source_rgba(ctx, 1, 0.2, 0.2, 0.6);
    plutovg_set_line_width(ctx, 6.0);

    plutovg_arc(ctx, xc, yc, 10.0, 0, 2 * M_PI, 0);
    plutovg_fill(ctx);

    plutovg_arc(ctx, xc, yc, radius, angle1, angle1, 0);
    plutovg_line_to(ctx, xc, yc);
    plutovg_arc(ctx, xc, yc, radius, angle2, angle2, 0);
    plutovg_line_to(ctx, xc, yc);
    plutovg_stroke(ctx);

    plutovg_surface_write_to_png(surface, filename);
    plutovg_destroy(ctx);
    plutovg_surface_destroy(surface);
}
commented

the code is dead loop in last [plutovg_stroke] call， why?

which shoud be draw as :

arc
arc_negative

commented

Thank you for opening this issue....

The current arc mathematics is bizarre... I will try to fix it over the weekend.

commented

nice job ! test OK @sammycage

commented 
static void test_rounded_rectangle(const char * filename)
{
    plutovg_surface_t * surface = plutovg_surface_create(256, 256);
    plutovg_t * ctx = plutovg_create(surface);

    double x = 25.6,
        y = 25.6,
        width = 204.8,
        height = 204.8,
        aspect = 1.0,
        corner_radius = height / 10.0;
    double radius = corner_radius / aspect;
    double degrees = M_PI / 180.0;

    plutovg_new_path(ctx);
    plutovg_arc(ctx, x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees, 0);
    plutovg_arc(ctx, x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees, 0);
    plutovg_arc(ctx, x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees, 0);
    plutovg_arc(ctx, x + radius, y + radius, radius, 180 * degrees, 270 * degrees, 0);
    plutovg_close_path(ctx);

    plutovg_set_source_rgb(ctx, 0.5, 0.5, 1);
    plutovg_fill_preserve(ctx);
    plutovg_set_source_rgba(ctx, 0.5, 0, 0, 0.5);
    plutovg_set_line_width(ctx, 10.0);
    plutovg_stroke(ctx);

    plutovg_surface_write_to_png(surface, filename);
    plutovg_destroy(ctx);
    plutovg_surface_destroy(surface);
}

which should be:
rounded_rectangle

but now is
rounded_rectangle

Yesterday's version was OK， today is wrong

commented

Test is ok, very good! Thanks very much ! @sammycage