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test-clip: Replace the ellipse with a rotated rectangle

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With test-clip it's possible to draw three different shapes depending
on what mouse button is used: a rectangle, an ellipse or a path
containing multiple shapes. However the ellipse is also a path so it
doesn't really test anything extra from the third option. This
replaces the ellipse with a rectangle that is first rotated by the
modelview matrix. The rotated matrix won't be able to use the scissor
so it can be used to test stencil and clip plane clipping.
This commit is contained in:
Neil Roberts 2011-01-24 17:17:16 +00:00
parent 5137d0a23f
commit 6102f80244
1 changed files with 34 additions and 7 deletions
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41
tests/interactive/test-clip.c
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@ -1,5 +1,6 @@
#include <clutter/clutter.h>
#include <gmodule.h>
#include <math.h>
typedef struct _CallbackData CallbackData;
typedef struct _Clip Clip;
@ -8,7 +9,7 @@ typedef enum
{
CLIP_NONE,
CLIP_RECTANGLE,
CLIP_ELLIPSE,
CLIP_ROTATED_RECTANGLE,
CLIP_SHAPES
} ClipType;
@ -77,11 +78,19 @@ make_clip_path (Clip *clip)
clip->y2);
break;
case CLIP_ELLIPSE:
cogl_path_ellipse ((clip->x1 + clip->x2) / 2,
(clip->y1 + clip->y2) / 2,
(clip->x2 - clip->x1) / 2,
(clip->y2 - clip->y1) / 2);
case CLIP_ROTATED_RECTANGLE:
{
int size = MIN (ABS (clip->x2 - clip->x1),
ABS (clip->y2 - clip->y1));
int cx = (clip->x1 + clip->x2) / 2;
int cy = (clip->y1 + clip->y2) / 2;
cogl_path_move_to (cx - size / 2, cy);
cogl_path_line_to (cx, cy - size / 2);
cogl_path_line_to (cx + size / 2, cy);
cogl_path_line_to (cx, cy + size / 2);
cogl_path_close ();
}
break;
case CLIP_SHAPES:
@ -138,6 +147,24 @@ on_paint (ClutterActor *actor, CallbackData *data)
clip->y1,
clip->x2,
clip->y2);
else if (clip->type == CLIP_ROTATED_RECTANGLE)
{
float size = MIN (ABS (clip->x2 - clip->x1),
ABS (clip->y2 - clip->y1));
int cx = (clip->x1 + clip->x2) / 2;
int cy = (clip->y1 + clip->y2) / 2;
size = sqrtf ((size / 2) * (size / 2) * 2);
cogl_push_matrix ();
/* Rotate 45° about the centre point */
cogl_translate (cx, cy, 0.0f);
cogl_rotate (45.0f, 0.0f, 0.0f, 1.0f);
cogl_clip_push_rectangle (-size / 2, -size / 2, size / 2, size / 2);
cogl_pop_matrix ();
}
else
{
make_clip_path (clip);
@ -207,7 +234,7 @@ on_button_press (ClutterActor *stage, ClutterButtonEvent *event,
data->current_clip.type
= event->button == 1 ? CLIP_RECTANGLE
: event->button == 2 ? CLIP_SHAPES
: CLIP_ELLIPSE;
: CLIP_ROTATED_RECTANGLE;
clutter_actor_queue_redraw (stage);