Points in Figures: Rectangles, Circles, and Triangles

Given a list of figures (rectangles, circles, and triangles) and a list of points in the x-y plane, determine for each point which figures (if any) contain the point.

Input

There will be n(Ÿ 10) figures descriptions, one per line. The first character will designate the type of figure (``r'', ``c'', ``t'' for rectangle, circle, or triangle, respectively). This character will be followed by values which describe that figure.

• For a rectangle, there will be four real values designating the x-y coordinates of the upper left and lower right corners.
• For a circle, there will be three real values, designating the x-y coordinates of the center and the radius.
• For a triangle, there will be six real values designating the x-y coordinates of the vertices.

The remaining lines will contain the x-y coordinates, one per line, of the points to be tested. The end of this list will be indicated by a point with coordinates 9999.9 9999.9; these values should not be included in the output.

Points coinciding with a figure border are not considered inside.

Output

For each point to be tested, write a message of the form:

Point i is contained in figure j

Point i is not contained in any figure

Sample Input

r 8.5 17.0 25.5 -8.5
c 20.2 7.3 5.8
t -1.0 -1.0 10.1 2.2 .4 1.4
r 0.0 10.3 5.5 0.0
c -5.0 -5.0 3.7
t 20.3 9.8 10.0 -3.2 17.5 -7.7
r 2.5 12.5 12.5 2.5
c 5.0 15.0 7.2
t -10.0 -10.0 10.0 25.0 30.0 -10.0
*
2.0 2.0
4.7 5.3
6.9 11.2
20.0 20.0
17.6 3.2
-5.2 -7.8
9999.9 9999.9

Sample Output

Point 1 is contained in figure 4
Point 1 is contained in figure 9
Point 2 is contained in figure 4
Point 2 is contained in figure 7
Point 2 is contained in figure 9
Point 3 is contained in figure 7
Point 3 is contained in figure 8
Point 3 is contained in figure 9
Point 4 is not contained in any figure
Point 5 is contained in figure 1
Point 5 is contained in figure 2
Point 5 is contained in figure 6
Point 5 is contained in figure 9
Point 6 is contained in figure 5
Point 6 is contained in figure 9

Diagrama of sample input figures and data points

#include <stdio.h>
#define eps 0
typedef struct {
    double x, y;
} Point;
typedef struct {
    Point a, b, c;
    double r;
    int sh;
} Shape;
Shape D[1000];
double cross(Point &o, Point &a, Point &b) {
    return (a.x - o.x)*(b.y - o.y) - (a.y - o.y)*(b.x - o.x);
}
int inShape(Point &a, Point &b, Point &c, Point &t) {
    if(cross(a, b, t)*cross(a, c, t) > eps) {
        return 0;
    }
    if(cross(b, a, t)*cross(b, c, t) > eps) {
        return 0;
    }
    if(cross(c, a, t)*cross(c, b, t) > eps) {
        return 0;
    }
    return 1;
}
int main() {
    int n = 0, i;
    char s[1000];
    while(scanf("%s", s)) {
        if(s[0] == '*')
            break;
        if(s[0] == 'r') {
            scanf("%lf %lf %lf %lf %lf", &D[n].a.x, &D[n].a.y, &D[n].b.x, &D[n].b.y);
            D[n].sh = 1;
        } else if(s[0] == 'c') {
            scanf("%lf %lf %lf", &D[n].a.x, &D[n].a.y, &D[n].r);
            D[n].sh = 2;
        } else {
            scanf("%lf %lf %lf %lf %lf %lf", &D[n].a.x, &D[n].a.y, &D[n].b.x, &D[n].b.y, &D[n].c.x, &D[n].c.y);
            D[n].sh = 3;
        }
        n++;
    }
    int test = 0;
    double x, y;
    while(scanf("%lf %lf", &x, &y) == 2) {
        if(x == 9999.9 && y == 9999.9)
            break;
        test++;
        int flag = 0;
        for(i = 0; i < n; i++) {
            if(D[i].sh == 1) {
                if(D[i].a.x < x && x < D[i].b.x && D[i].a.y > y && y > D[i].b.y) {
                    printf("Point %d is contained in figure %d\n", test, i+1);
                    flag = 1;
                }
            } else if(D[i].sh == 2) {
                if((D[i].a.x-x)*(D[i].a.x-x)+(D[i].a.y-y)*(D[i].a.y-y) < D[i].r*D[i].r) {
                    printf("Point %d is contained in figure %d\n", test, i+1);
                    flag = 1;
                }
            } else {
                Point t;
                t.x = x, t.y = y;
                if(inShape(D[i].a, D[i].b, D[i].c, t)) {
                    printf("Point %d is contained in figure %d\n", test, i+1);
                    flag = 1;
                }
            }
        }
        if(!flag)
            printf("Point %d is not contained in any figure\n", test);
    }
    return 0;
}