Actual source code: ex7.c
1: static char help[] = "Demonstrates drawing primitives in a window\n";
3: #include <petscdraw.h>
5: int main(int argc, char **argv)
6: {
7: PetscDraw draw;
9: int i, j, w, h;
10: int k = PETSC_DRAW_BLACK;
11: int r = PETSC_DRAW_RED;
12: int g = PETSC_DRAW_GREEN;
13: int b = PETSC_DRAW_BLUE;
14: int y = PETSC_DRAW_YELLOW;
15: int c0 = PETSC_DRAW_BASIC_COLORS;
16: int c2 = 255;
17: int c1 = (c0 + c2) / 2;
19: PetscFunctionBeginUser;
20: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
22: PetscCall(PetscDrawCreate(PETSC_COMM_WORLD, 0, "Draw Example", PETSC_DECIDE, PETSC_DECIDE, 101, 101, &draw));
23: /* PetscCall(PetscDrawSetPause(draw,2.0)); */
24: PetscCall(PetscDrawSetFromOptions(draw));
26: PetscCall(PetscDrawCheckResizedWindow(draw));
27: PetscCall(PetscDrawGetWindowSize(draw, &w, &h));
28: PetscCall(PetscDrawSetCoordinates(draw, 0, 0, --w, --h));
29: PetscCall(PetscDrawClear(draw));
30: /* one-pixel lines in the window corners */
31: PetscCall(PetscDrawLine(draw, 0, 0, 0, 0, r));
32: PetscCall(PetscDrawLine(draw, w, 0, w, 0, r));
33: PetscCall(PetscDrawLine(draw, 0, h, 0, h, r));
34: PetscCall(PetscDrawLine(draw, w, h, w, h, r));
35: /* border lines with two pixels from borders */
36: PetscCall(PetscDrawLine(draw, 0 + 2, 0, w - 2, 0, k));
37: PetscCall(PetscDrawLine(draw, 0 + 2, h, w - 2, h, k));
38: PetscCall(PetscDrawLine(draw, 0, 0 + 2, 0, h - 2, k));
39: PetscCall(PetscDrawLine(draw, w, 0 + 2, w, h - 2, k));
40: /* oblique lines */
41: PetscCall(PetscDrawLine(draw, 0 + 2, h / 2, w - 2, h - 2, b));
42: PetscCall(PetscDrawLine(draw, 0 + 1, h - 1, w - 1, 0 + 1, b));
43: /* vertical up and down arrow, two pixels from borders */
44: PetscCall(PetscDrawArrow(draw, 1 * w / 4, 0 + 2, 1 * w / 4, h - 2, g));
45: PetscCall(PetscDrawArrow(draw, 3 * w / 4, h - 2, 3 * w / 4, 0 + 2, g));
46: /* horizontal right and left arrow, two pixels from borders */
47: PetscCall(PetscDrawArrow(draw, 0 + 2, 3 * h / 4, w - 2, 3 * h / 4, g));
48: PetscCall(PetscDrawArrow(draw, w - 2, 1 * h / 4, 0 + 2, 1 * h / 4, g));
49: /* flush, save, and pause */
50: PetscCall(PetscDrawFlush(draw));
51: PetscCall(PetscDrawSave(draw));
52: PetscCall(PetscDrawPause(draw));
54: PetscCall(PetscDrawCheckResizedWindow(draw));
55: PetscCall(PetscDrawGetWindowSize(draw, &w, &h));
56: PetscCall(PetscDrawSetCoordinates(draw, 0, 0, --w, --h));
57: PetscCall(PetscDrawClear(draw));
58: /* one-pixel rectangles in the window corners */
59: PetscCall(PetscDrawRectangle(draw, 0, 0, 0, 0, k, k, k, k));
60: PetscCall(PetscDrawRectangle(draw, w, 0, w, 0, k, k, k, k));
61: PetscCall(PetscDrawRectangle(draw, 0, h, 0, h, k, k, k, k));
62: PetscCall(PetscDrawRectangle(draw, w, h, w, h, k, k, k, k));
63: /* border rectangles with two pixels from borders */
64: PetscCall(PetscDrawRectangle(draw, 0 + 2, 0, w - 2, 0, k, k, k, k));
65: PetscCall(PetscDrawRectangle(draw, 0 + 2, h, w - 2, h, k, k, k, k));
66: PetscCall(PetscDrawRectangle(draw, 0, 0 + 2, 0, h - 2, k, k, k, k));
67: PetscCall(PetscDrawRectangle(draw, w, 0 + 2, w, h - 2, k, k, k, k));
68: /* more rectangles */
69: PetscCall(PetscDrawRectangle(draw, 0 + 2, 0 + 2, w / 2 - 1, h / 2 - 1, b, b, b, b));
70: PetscCall(PetscDrawRectangle(draw, 0 + 2, h / 2 + 1, w / 2 - 1, h - 2, r, r, r, r));
71: PetscCall(PetscDrawRectangle(draw, w / 2 + 1, h / 2 + 1, w - 2, h - 2, g, g, g, g));
72: PetscCall(PetscDrawRectangle(draw, w / 2 + 1, 0 + 2, w - 2, h / 2 - 1, y, y, y, y));
73: /* flush, save, and pause */
74: PetscCall(PetscDrawFlush(draw));
75: PetscCall(PetscDrawSave(draw));
76: PetscCall(PetscDrawPause(draw));
78: PetscCall(PetscDrawCheckResizedWindow(draw));
79: PetscCall(PetscDrawGetWindowSize(draw, &w, &h));
80: PetscCall(PetscDrawSetCoordinates(draw, 0, 0, --w, --h));
81: PetscCall(PetscDrawClear(draw));
82: /* interpolated triangles, one pixel from borders */
83: PetscCall(PetscDrawTriangle(draw, 0 + 1, 0 + 1, w - 1, 0 + 1, w - 1, h - 1, c0, c1, c2));
84: PetscCall(PetscDrawTriangle(draw, 0 + 1, 0 + 1, 0 + 1, h - 1, w - 1, h - 1, c0, c1, c2));
85: /* interpolated triangle, oblique, inside canvas */
86: PetscCall(PetscDrawTriangle(draw, w / 4, h / 4, w / 2, 3 * h / 4, 3 * w / 4, h / 2, c2, c1, c0));
87: /* flush, save, and pause */
88: PetscCall(PetscDrawFlush(draw));
89: PetscCall(PetscDrawSave(draw));
90: PetscCall(PetscDrawPause(draw));
92: PetscCall(PetscDrawCheckResizedWindow(draw));
93: PetscCall(PetscDrawGetWindowSize(draw, &w, &h));
94: PetscCall(PetscDrawSetCoordinates(draw, 0, 0, --w, --h));
95: PetscCall(PetscDrawClear(draw));
96: /* circles and ellipses */
97: PetscCall(PetscDrawEllipse(draw, w / 2, h / 2, w - 1, h - 1, r));
98: PetscCall(PetscDrawEllipse(draw, w, h / 2, w / 2, h, g));
99: PetscCall(PetscDrawEllipse(draw, 0, 0, w, h / 2, b));
100: PetscCall(PetscDrawEllipse(draw, w / 4, 3 * h / 4, w / 2, h / 4, y));
101: PetscCall(PetscDrawCoordinateToPixel(draw, w / 2, h / 2, &i, &j));
102: PetscCall(PetscDrawPointPixel(draw, i, j, k));
103: /* flush, save, and pause */
104: PetscCall(PetscDrawFlush(draw));
105: PetscCall(PetscDrawSave(draw));
106: PetscCall(PetscDrawPause(draw));
108: PetscCall(PetscDrawDestroy(&draw));
109: PetscCall(PetscFinalize());
110: return 0;
111: }
113: /*TEST
115: build:
116: requires: x
118: test:
119: output_file: output/ex1_1.out
121: TEST*/