/* if 2nd param is Qnil, then create a blank image with 'width' and 'height
otherwise, try to use the 2nd param (dup) to create a duplicate image
*/
VALUE
create_image(VALUE window, int width, int height)
{
static VALUE empty_image_stub = 0;
static VALUE image = 0;
if (empty_image_stub == 0) {
VALUE gosu = rb_const_get(rb_cObject, rb_intern("Gosu"));
VALUE tp = rb_const_get(rb_cObject, rb_intern("TexPlay"));
empty_image_stub = rb_const_get(tp, rb_intern("EmptyImageStub"));
image = rb_const_get(gosu, rb_intern("Image"));
}
VALUE rmagick_img;
VALUE new_image;
VALUE options = rb_hash_new();
set_hash_value(options, "caching", Qfalse);
rmagick_img = rb_funcall(empty_image_stub, rb_intern("new"), 2, INT2FIX(width), INT2FIX(height));
new_image = rb_funcall(image, rb_intern("new"), 3, window, rmagick_img, options);
return new_image;
}
/* TODO: fix this function below, it's too ugly and bulky and weird **/
static void
process_common_hash_args(action_struct * cur, VALUE * hash_arg, sync_ sync_mode, bool primary)
{
VALUE user_defaults;
VALUE hash_blend;
/* if a hash doesn't exist then create one */
if(!is_a_hash(*hash_arg))
*hash_arg = rb_hash_new();
/* init the action to default values */
initialize_action_struct(cur, *hash_arg, sync_mode);
/* get the user default options & merge with given options */
user_defaults = get_image_local(cur->tex->image, USER_DEFAULTS);
hash_blend = rb_funcall(user_defaults, rb_intern("merge"), 1, *hash_arg);
rb_funcall(*hash_arg, rb_intern("merge!"), 1, hash_blend);
if(has_optional_hash_arg(*hash_arg, "color")) {
VALUE c = get_from_hash(*hash_arg, "color");
cur->color = convert_rb_color_to_rgba(c);
if(c == string2sym("random")) {
set_hash_value(*hash_arg, "color", convert_rgba_to_rb_color(&cur->color));
}
}
/* shadows */
if(RTEST(get_from_hash(*hash_arg, "shadow"))) {
cur->pen.color_mult.red = 0.66;
cur->pen.color_mult.green = 0.66;
cur->pen.color_mult.blue = 0.66;
cur->pen.color_mult.alpha = 1;
cur->pen.has_color_control_transform = true;
}
/* tolerance */
if(RTEST(get_from_hash(*hash_arg, "tolerance"))) {
cur->pen.tolerance = NUM2DBL(get_from_hash(*hash_arg, "tolerance"));
/* maximum length of hypotonese extended in 4-space (color space) is sqrt(4) */
if (cur->pen.tolerance >= 2)
cur->pen.tolerance = 2;
if (cur->pen.tolerance < 0)
cur->pen.tolerance = 0;
cur->pen.has_tolerance = true;
}
/* lerp */
if(RTEST(get_from_hash(*hash_arg, "lerp"))) {
cur->pen.lerp = NUM2DBL(get_from_hash(*hash_arg, "lerp"));
/* bounds */
if(cur->pen.lerp > 1.0) cur->pen.lerp = 1.0;
if(cur->pen.lerp < 0.0) cur->pen.lerp = 0.0;
cur->pen.has_lerp = true;
}
/* sync mode */
if(has_optional_hash_arg(*hash_arg, "sync_mode")) {
VALUE user_sync_mode = get_from_hash(*hash_arg, "sync_mode");
Check_Type(user_sync_mode, T_SYMBOL);
if(user_sync_mode == string2sym("lazy_sync"))
cur->sync_mode = lazy_sync;
else if(user_sync_mode == string2sym("eager_sync"))
cur->sync_mode = eager_sync;
else if(user_sync_mode == string2sym("no_sync"))
cur->sync_mode = no_sync;
else
rb_raise(rb_eArgError, "unrecognized sync mode: %s\n. Allowable modes are "
":lazy_sync, :eager_sync, :no_sync.",
sym2string(user_sync_mode));
delete_from_hash(*hash_arg, "sync_mode");
}
/* prepare color selection */
prepare_color_select(cur);
/* process drawing mode */
prepare_drawing_mode(cur);
/* process the color_control block or transform (if there is one) */
prepare_color_control(cur);
/* process the filling texture (if there is one) */
prepare_fill_texture(cur);
/* does the user want to blend alpha values ? */
prepare_alpha_blend(cur);
}
trace_match
line_do_action(int x1, int y1, int x2, int y2, texture_info * tex, VALUE hash_arg,
texplay_sync sync_mode, bool primary, action_struct * payload)
{
int x, y, W, H, F;
int xinc, yinc;
action_struct cur;
int thickness = 1;
bool has_trace = false;
rgba trace_color;
trace_mode_type trace_mode = no_mode;
if(has_optional_hash_arg(hash_arg, "thickness"))
thickness = NUM2INT(get_from_hash(hash_arg, "thickness"));
if(has_optional_hash_arg(hash_arg, "trace") && primary) {
VALUE trace_hash = get_from_hash(hash_arg, "trace");
/* we're tracing (not drawing) */
has_trace = true;
/* since we're not drawing, no need to sync */
sync_mode = no_sync;
if(has_optional_hash_arg(trace_hash, "until_color")) {
VALUE c = get_from_hash(trace_hash, "until_color");
trace_color = convert_rb_color_to_rgba(c);
trace_mode = until_color;
}
else if(has_optional_hash_arg(trace_hash, "while_color")) {
VALUE c = get_from_hash(trace_hash, "while_color");
trace_color = convert_rb_color_to_rgba(c);
trace_mode = while_color;
}
}
draw_prologue(&cur, tex, x1, y1,
x2, y2, &hash_arg, sync_mode, primary, &payload);
/* clip the line */
cohen_sutherland_clip(&x1, &y1, &x2, &y2, 0, 0, tex->width - 1, tex->height - 1);
W = ABS(x2 - x1);
H = ABS(y2 - y1);
if(x1 < x2)
xinc = 1;
else
xinc = -1;
if(y1 < y2)
yinc = 1;
else
yinc = -1;
x = x1;
y = y1;
if(W >= H) {
F = 2 * H - W;
while(x != x2) {
if(thickness <= 1) {
if(!has_trace)
set_pixel_color_with_style(payload, tex, x, y);
else {
rgba c = get_pixel_color(tex, x, y);
if (is_trace_match(payload, c, trace_color, trace_mode))
return (trace_match) { x, y, c };
}
}
else {
set_hash_value(hash_arg, "fill", Qtrue);
circle_do_action(x, y, thickness / 2, tex, hash_arg, no_sync, false, payload);
}
if(F < 0)
F += 2 * H;
else {
F += 2 * (H - W);
y += yinc;
}
x += xinc;
}
}
else {
F = 2 * W - H;
while(y != y2 ) {
if(thickness <= 1) {
if(!has_trace)
set_pixel_color_with_style(payload, tex, x, y);
else {
rgba c = get_pixel_color(tex, x, y);
if (is_trace_match(payload, c, trace_color, trace_mode))
return (trace_match) { x, y, c };
}
}
else {
set_hash_value(hash_arg, "fill", Qtrue);
circle_do_action(x, y, thickness / 2, tex, hash_arg, no_sync, false, payload);
}
if(F < 0)
F += 2 * W;
else {
F += 2 * (W - H);
x += xinc;
}
y += yinc;
}
}
if(thickness <= 1) {
if(!has_trace)
set_pixel_color_with_style(payload, tex, x2, y2);
else {
rgba c = get_pixel_color(tex, x, y);
if (is_trace_match(payload, c, trace_color, trace_mode))
return (trace_match) { x, y, c };
}
}
else {
set_hash_value(hash_arg, "fill", Qtrue);
circle_do_action(x2, y2, thickness / 2, tex, hash_arg, no_sync, false, payload);
}
draw_epilogue(&cur, tex, primary);
return (trace_match) { .x = -9999, .y = -9999, .color = not_a_color_v };
}
/** end line **/
/** polyline algorithm **/
/* used by both polyline and bezier */
#define SIMPLE_FORMAT 0
#define POINT_FORMAT 1
/* calculate a single point */
static void
polyline_point(VALUE points, int k, int * x, int * y, int format, int draw_offset_x,
int draw_offset_y)
{
int xy_index;
switch(format) {
case POINT_FORMAT:
*x = NUM2INT(point_x(get_from_array(points, k))) + draw_offset_x;
*y = NUM2INT(point_y(get_from_array(points, k))) + draw_offset_y;
break;
case SIMPLE_FORMAT:
xy_index = k * 2;
*x = NUM2INT(get_from_array(points, xy_index)) + draw_offset_x;
*y = NUM2INT(get_from_array(points, xy_index + 1)) + draw_offset_y;
break;
default:
rb_raise(rb_eArgError, "pixel format must be either POINT_FORMAT or SIMPLE_FORMAT");
}
}