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@slouken
slouken committed Jan 4, 2009
1 parent 9226398 commit 337a50e
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Showing 3 changed files with 85 additions and 60 deletions.
36 changes: 19 additions & 17 deletions src/video/SDL_rect.c
View file
Expand Up @@ -184,23 +184,22 @@ SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
return SDL_TRUE;
}

else
{
/* The task of clipping a line with finite slope ratios in a fixed-
* precision coordinate space is not as immediately simple as it is
* with coordinates of arbitrary precision. If the ratio of slopes
* between the input line segment and the result line segment is not
* a whole number, you have in fact *moved* the line segment a bit,
* and there can be no avoiding it without more precision
*/
int *x_result_[] = {X1, X2, NULL}, **x_result = x_result_;
int *y_result_[] = {Y1, Y2, NULL}, **y_result = y_result_;
else {
/* The task of clipping a line with finite slope ratios in a fixed-
* precision coordinate space is not as immediately simple as it is
* with coordinates of arbitrary precision. If the ratio of slopes
* between the input line segment and the result line segment is not
* a whole number, you have in fact *moved* the line segment a bit,
* and there can be no avoiding it without more precision
*/
int *x_result_[] = { X1, X2, NULL }, **x_result = x_result_;
int *y_result_[] = { Y1, Y2, NULL }, **y_result = y_result_;
SDL_bool intersection = SDL_FALSE;
double b, m, left, right, bottom, top;
int xl, xh, yl, yh;

/* solve mx+b line formula */
m = (double)(y1-y2) / (double)(x1-x2);
m = (double) (y1 - y2) / (double) (x1 - x2);
b = y2 - m * (double) x2;

/* find some linear intersections */
Expand Down Expand Up @@ -232,8 +231,8 @@ SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
x_result++;
y_result++;
intersection = SDL_TRUE;
} else /* it was determined earlier that *both* end-points are not contained */

} else
/* it was determined earlier that *both* end-points are not contained */
if (RISING(rectx1, x2, rectx2) && RISING(recty1, y2, recty2)) {
**(x_result++) = x2;
**(y_result++) = y2;
Expand All @@ -246,21 +245,24 @@ SDL_IntersectRectAndLine(const SDL_Rect * rect, int *X1, int *Y1, int *X2,
intersection = SDL_TRUE;
}

if (*x_result == NULL) return intersection;
if (*x_result == NULL)
return intersection;
if (RISING(recty1, right, recty2) && RISING(xl, rectx2, xh)) {
**(x_result++) = rectx2;
**(y_result++) = (int) right;
intersection = SDL_TRUE;
}

if (*x_result == NULL) return intersection;
if (*x_result == NULL)
return intersection;
if (RISING(rectx1, top, rectx2) && RISING(yl, recty1, yh)) {
**(x_result++) = (int) top;
**(y_result++) = recty1;
intersection = SDL_TRUE;
}

if (*x_result == NULL) return intersection;
if (*x_result == NULL)
return intersection;
if (RISING(rectx1, bottom, rectx2) && RISING(yl, recty2, yh)) {
**(x_result++) = (int) bottom;
**(y_result++) = recty2;
Expand Down
12 changes: 8 additions & 4 deletions src/video/x11/SDL_x11events.c
View file
Expand Up @@ -292,17 +292,21 @@ X11_DispatchEvent(_THIS)
switch (xevent.type) {
case MotionNotify:
#ifdef DEBUG_MOTION
printf("X11 motion: %d,%d\n", xevent.xmotion.x, xevent.xmotion.y);
printf("X11 motion: %d,%d\n", xevent.xmotion.x,
xevent.xmotion.y);
#endif
SDL_SendMouseMotion(mouse->id, 0, xevent.xmotion.x, xevent.xmotion.y, 0);
SDL_SendMouseMotion(mouse->id, 0, xevent.xmotion.x,
xevent.xmotion.y, 0);
break;

case ButtonPress:
SDL_SendMouseButton(mouse->id, SDL_PRESSED, xevent.xbutton.button);
SDL_SendMouseButton(mouse->id, SDL_PRESSED,
xevent.xbutton.button);
break;

case ButtonRelease:
SDL_SendMouseButton(mouse->id, SDL_RELEASED, xevent.xbutton.button);
SDL_SendMouseButton(mouse->id, SDL_RELEASED,
xevent.xbutton.button);
break;
}
continue;
Expand Down
97 changes: 58 additions & 39 deletions test/testintersections.c
View file
Expand Up @@ -67,9 +67,13 @@ DrawPoints(SDL_WindowID window)
#define MAX_LINES 16
int num_lines = 0;
SDL_Rect lines[MAX_LINES];
static int add_line(int x1, int y1, int x2, int y2) {
if (num_lines >= MAX_LINES) return 0;
if ((x1 == x2) && (y1 == y2)) return 0;
static int
add_line(int x1, int y1, int x2, int y2)
{
if (num_lines >= MAX_LINES)
return 0;
if ((x1 == x2) && (y1 == y2))
return 0;

printf("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
lines[num_lines].x = x1;
Expand Down Expand Up @@ -110,14 +114,21 @@ DrawLines(SDL_WindowID window)
#define MAX_RECTS 16
int num_rects = 0;
SDL_Rect rects[MAX_RECTS];
static int add_rect(int x1, int y1, int x2, int y2) {
if (num_rects >= MAX_RECTS) return 0;
if ((x1 == x2) || (y1 == y2)) return 0;
static int
add_rect(int x1, int y1, int x2, int y2)
{
if (num_rects >= MAX_RECTS)
return 0;
if ((x1 == x2) || (y1 == y2))
return 0;

if (x1 > x2) SWAP(int, x1, x2);
if (y1 > y2) SWAP(int, y1, y2);
if (x1 > x2)
SWAP(int, x1, x2);
if (y1 > y2)
SWAP(int, y1, y2);

printf("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2, x2-x1, y2-y1);
printf("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
x2 - x1, y2 - y1);

rects[num_rects].x = x1;
rects[num_rects].y = y1;
Expand Down Expand Up @@ -155,21 +166,21 @@ DrawRectLineIntersections(SDL_WindowID window)
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);

for (i = 0; i < num_rects; i++)
for (j = 0; j < num_lines; j++) {
int x1, y1, x2, y2;
SDL_Rect r;

r = rects[i];
x1 = lines[j].x;
y1 = lines[j].y;
x2 = lines[j].w;
y2 = lines[j].h;

if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
SDL_SetRenderDrawColor(0, 255, 55, 255);
SDL_RenderLine(x1, y1, x2, y2);
for (j = 0; j < num_lines; j++) {
int x1, y1, x2, y2;
SDL_Rect r;

r = rects[i];
x1 = lines[j].x;
y1 = lines[j].y;
x2 = lines[j].w;
y2 = lines[j].h;

if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
SDL_SetRenderDrawColor(0, 255, 55, 255);
SDL_RenderLine(x1, y1, x2, y2);
}
}
}

SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
Expand All @@ -182,13 +193,13 @@ DrawRectRectIntersections(SDL_WindowID window)
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);

for (i = 0; i < num_rects; i++)
for (j = i+1; j < num_rects; j++) {
SDL_Rect r;
if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
SDL_SetRenderDrawColor(255, 200, 0, 255);
SDL_RenderFill(&r);
for (j = i + 1; j < num_rects; j++) {
SDL_Rect r;
if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
SDL_SetRenderDrawColor(255, 200, 0, 255);
SDL_RenderFill(&r);
}
}
}

SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
}
Expand Down Expand Up @@ -285,21 +296,29 @@ main(int argc, char *argv[])
case SDL_MOUSEBUTTONUP:
if (event.button.which == 0) {
if (event.button.button == 3)
add_line(mouse_begin_x, mouse_begin_y, event.button.x, event.button.y);
add_line(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
if (event.button.button == 1)
add_rect(mouse_begin_x, mouse_begin_y, event.button.x, event.button.y);
add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
event.button.y);
}
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym) {
case 'l':
if (event.key.keysym.mod & KMOD_SHIFT) num_lines = 0;
else add_line(rand()%640, rand()%480, rand()%640, rand()%480);
break;
case 'r':
if (event.key.keysym.mod & KMOD_SHIFT) num_rects = 0;
else add_rect(rand()%640, rand()%480, rand()%640, rand()%480);
break;
case 'l':
if (event.key.keysym.mod & KMOD_SHIFT)
num_lines = 0;
else
add_line(rand() % 640, rand() % 480, rand() % 640,
rand() % 480);
break;
case 'r':
if (event.key.keysym.mod & KMOD_SHIFT)
num_rects = 0;
else
add_rect(rand() % 640, rand() % 480, rand() % 640,
rand() % 480);
break;
}
break;
case SDL_WINDOWEVENT:
Expand Down

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