| from matplotlib.patches import Polygon |
| import numpy as np |
|
|
| def build_grid_squares(points_per_edge, resolution, bbox, ax=None): |
| xscale = bbox[1][0] - bbox[0][0] |
| yscale = bbox[1][1] - bbox[0][1] |
| binx = xscale / resolution[0] |
| biny = yscale / resolution[1] |
| stepx = binx / points_per_edge |
| stepy = biny / points_per_edge |
| points = np.zeros([0, 2]) |
| for i in range(resolution[0]): |
| for j in range(resolution[1]): |
| vec = np.zeros([4 * points_per_edge + 1, 2]) |
| vec[0:points_per_edge, 0] = np.arange( |
| i * binx, (i+1) * binx, stepx)[0:points_per_edge] |
| vec[0:points_per_edge, 1] = -j * biny |
| vec[points_per_edge: 2 * points_per_edge, 0] = (i+1) * binx |
| vec[points_per_edge: 2 * points_per_edge, |
| 1] = np.arange(-j * biny, -(j+1) * biny, -stepy)[0:points_per_edge] |
| vec[2 * points_per_edge: 3 * points_per_edge, |
| 0] = np.arange((i+1) * binx, i * binx, -stepx)[0:points_per_edge] |
| vec[2 * points_per_edge: 3 * points_per_edge, 1] = - (j + 1) * biny |
| vec[3 * points_per_edge: 4 * points_per_edge, 0] = i * binx |
| vec[3 * points_per_edge: 4 * points_per_edge, |
| 1] = np.arange(-(j+1) * biny, -j * biny, stepy)[0:points_per_edge] |
| vec[-1] = vec[0] |
| vec += np.array([bbox[0][0], bbox[1][1]]) |
| points = np.vstack([points, vec]) |
| if (ax is not None): |
| color = 'red' if (i+j) % 2 == 1 else "blue" |
| polygon = Polygon(vec, edgecolor=None, facecolor=color) |
| ax.add_patch(polygon) |
| return points.T |
|
|
| def sketch_grid_squares(points, points_per_edge, resolution, ax): |
| num_points = points.shape[0] // (4 * points_per_edge + 1) |
| for i in range(num_points): |
| p = points[i * (4 * points_per_edge + 1): (i+1) |
| * (4 * points_per_edge + 1)] |
| color = 'red' if ( |
| ((i // resolution[0]) + (i % resolution[1])) % 2 == 0) else "blue" |
| polygon = Polygon(p, edgecolor=None, facecolor=color) |
| ax.add_patch(polygon) |
| disable_ticks(ax) |
|
|
| def disable_ticks(ax): |
| """Disable ticks around plot (useful for displaying images)""" |
| ax.axes.get_xaxis().set_ticklabels([]) |
| ax.axes.get_yaxis().set_ticklabels([]) |
| ax.axes.get_xaxis().set_ticks([]) |
| ax.axes.get_yaxis().set_ticks([]) |
