Example #1
0
class SmudgeBrushStroke (AbstractBrushStroke):
    def __init__(self, goghview, current_layer_key, brush_options):
        AbstractBrushStroke.__init__(self, goghview, current_layer_key, brush_options)
        self.brush_options = brush_options
        self.bounding_rectangle = None
        self.brush_provider = BrushProvider(brush_options)
        self.x_prev, self.y_prev = None, None

    def trim_to_fit(self, x1, x2, w):
        return (max(x1, 0), min(x2, w))



    def apply_brush_stroke(self, x0, y0, x1, y1, intermediate_coords, max_pressure):
        layer = self.goghdoc.layer_for_key(self.current_layer_key)
        pix_array = layer.pixbuf.get_pixels_array()
        smudge_amt = self.brush_options.smudge_amount
        for x, y, pressure in intermediate_coords:
            adj_brush = self.brush_provider.get_adjusted_brush(pressure, x-int(x), y-int(y))
            brush_w, brush_h = adj_brush.shape[0], adj_brush.shape[1]
            brush = zeros((brush_w, brush_h, 1), float)
            brush[...,0] = adj_brush[...]
            xt = int(floor(x))-adj_brush.shape[1]//2
            yt = int(floor(y))-adj_brush.shape[0]//2
            if self.x_prev and self.y_prev:
                x_ofs, y_ofs = min(self.x_prev, xt, 0), min(self.y_prev, yt, 0)
                x_ofs2 = max(xt+brush_w, self.x_prev+brush_w, self.goghdoc.width)-self.goghdoc.width
                y_ofs2 = max(yt+brush_w, self.y_prev+brush_h, self.goghdoc.height)-self.goghdoc.height
                if (x_ofs2-x_ofs<brush_w) and (y_ofs2-y_ofs<brush_h):
                    brush_fragment = brush[-y_ofs:brush_h-y_ofs2,-x_ofs:brush_w-x_ofs2]
                    t = pix_array[yt-y_ofs:yt+brush_h-y_ofs2, xt-x_ofs:xt+brush_w-x_ofs2]*(1-smudge_amt)+pix_array[self.y_prev-y_ofs:self.y_prev+brush_h-y_ofs2, self.x_prev-x_ofs:self.x_prev+brush_w-x_ofs2]*smudge_amt
                    pix_array[yt-y_ofs:yt+brush_h-y_ofs2, xt-x_ofs:xt+brush_w-x_ofs2] = (minimum(255, 0.5+pix_array[yt-y_ofs:yt+brush_h-y_ofs2, xt-x_ofs:xt+brush_w-x_ofs2]*(1-brush_fragment)+t*brush_fragment)).astype(uint8)[:,:]
            self.x_prev, self.y_prev = xt, yt
        self.goghdoc.combine_layers(self.bounding_rectangle.x, self.bounding_rectangle.y, self.bounding_rectangle.width, self.bounding_rectangle.height)