summaryrefslogtreecommitdiff
path: root/xd.c
diff options
context:
space:
mode:
Diffstat (limited to 'xd.c')
-rw-r--r--xd.c104
1 files changed, 103 insertions, 1 deletions
diff --git a/xd.c b/xd.c
index 7246c5c..e544851 100644
--- a/xd.c
+++ b/xd.c
@@ -51,6 +51,7 @@ static const char id[]="$Id$";
#endif
#define RAD(x) ((x)*M_PI/180.0)
+#define DEG(x) ((x)/(M_PI/180.0))
#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))
@@ -163,10 +164,11 @@ static void PolyDropDemo(void);
static void CraterDemo(void);
static void TriangleDemo(void);
static void TriangleDemo2(void);
+static void FollowDemo(void);
/* ---------------------------------------- GLOBAL VARS
*/
-#define NO_DEMOS 15
+#define NO_DEMOS 16
static int demo=NO_DEMOS-1;
@@ -249,6 +251,11 @@ static DemoInfo demotbl[NO_DEMOS]=
TriangleDemo2,
UsesPixmap
},
+ {
+ "Following swarm",
+ FollowDemo,
+ UsesPixmap
+ },
};
/* ---------------------------------------- X11 VARS
@@ -3649,3 +3656,98 @@ static void TriangleDemo2(void)
/* END OF FILE */
+
+
+/* ---------------------------------------- FOLLOW DEMO
+ */
+#define FOLLOW_NUM 4000
+#define FOLLOW_SPEED 1
+#define FOLLOW_WEIGHT 0.001
+
+static void FollowDemo(void)
+{
+ static int init=FALSE;
+ static double x[FOLLOW_NUM];
+ static double y[FOLLOW_NUM];
+ static double dx[FOLLOW_NUM];
+ static double dy[FOLLOW_NUM];
+
+ int f,r;
+ int newa;
+
+ if (!init || mouse_b&Button1Mask)
+ {
+ for(f = 0; f < FOLLOW_NUM; f++)
+ {
+ x[f] = RND(width);
+ y[f] = RND(height);
+ dx[f] = 0;
+ dy[f] = 0;
+ }
+
+ init = TRUE;
+ }
+
+ Cls();
+
+ for(f = 0; f < FOLLOW_NUM; f++)
+ {
+ double d_x,d_y,d;
+
+ d_x = mouse_x - x[f];
+ d_y = mouse_y - y[f];
+
+ if (d_x == 0)
+ {
+ d_x = 0.0001;
+ }
+
+ if (d_y == 0)
+ {
+ d_y = 0.0001;
+ }
+
+ if (fabs(d_x) > fabs(d_y))
+ {
+ d = fabs(d_x);
+ }
+ else
+ {
+ d = fabs(d_y);
+ }
+
+ d_x = d_x / d * FOLLOW_WEIGHT;
+ d_y = d_y / d * FOLLOW_WEIGHT;
+
+ dx[f] += d_x;
+ dy[f] += d_y;
+
+ if (dx[f] < -FOLLOW_SPEED)
+ {
+ dx[f] = -FOLLOW_SPEED;
+ }
+
+ if (dx[f] > FOLLOW_SPEED)
+ {
+ dx[f] = FOLLOW_SPEED;
+ }
+
+ if (dy[f] < -FOLLOW_SPEED)
+ {
+ dy[f] = -FOLLOW_SPEED;
+ }
+
+ if (dy[f] > FOLLOW_SPEED)
+ {
+ dy[f] = FOLLOW_SPEED;
+ }
+
+ x[f] += dx[f];
+ y[f] += dy[f];
+
+ Line(x[f], y[f], x[f]-dx[f], y[f]-dy[f], red);
+ }
+}
+
+
+/* END OF FILE */