| """ |
| Defines a base class for drawn jobs. |
| """ |
|
|
| |
| |
| |
| |
|
|
|
|
| import cairo |
| from jobcalc.helper import draw_text_box, Point, TextInfo |
|
|
|
|
| class DrawnComponent: |
|
|
| """ |
| DrawnComponent class to be used to automatically create a drawing. |
| |
| This is a base class from which classes for specific components |
| should inherit. Instances of this class are not intended to be |
| directly drawn. |
| |
| Public methods: |
| __init__() |
| draw() |
| """ |
|
|
| def __init__(self): |
|
|
| """ |
| Initializes a DrawnComponent instance. |
| |
| Subclasses should call this at the beginning of their |
| own constructor function. |
| """ |
|
|
| |
|
|
| self.scale = 1 |
| self.drawing_line_width = 0.5 |
| self.drawing_line_color = (0, 0, 0) |
| self.hatching = False |
|
|
| |
|
|
| self.dash_style = [7.0, 2.0, 2.0, 2.0] |
|
|
| self.text = {"dims": TextInfo(face="Arial", size=8, |
| padding=3, color=(0.0, 0.0, 0.0)), |
| "info": TextInfo(face="Arial", size=8, |
| padding=3, color=(0.0, 0.0, 0.0)), |
| "notice": TextInfo(face="Arial", size=10, |
| padding=3, color=(0.0, 0.0, 0.0))} |
|
|
| |
|
|
| if self.hatching: |
| chatch = cairo.ImageSurface(cairo.FORMAT_RGB24, 10, 10) |
| ctx = cairo.Context(chatch) |
| ctx.set_source_rgb(1, 1, 1) |
| ctx.paint() |
| ctx.set_source_rgb(0, 0, 0) |
| ctx.set_line_width(1) |
| ctx.move_to(0, 10) |
| ctx.line_to(10, 0) |
| ctx.stroke() |
| self.chatch = cairo.SurfacePattern(chatch) |
|
|
| lhatch = cairo.ImageSurface(cairo.FORMAT_RGB24, 10, 10) |
| ctx = cairo.Context(lhatch) |
| ctx.set_source_rgb(0, 0, 0) |
| ctx.paint() |
| ctx.set_source_rgb(1, 1, 1) |
| ctx.set_line_width(1) |
| ctx.move_to(0, 10) |
| ctx.line_to(10, 0) |
| ctx.move_to(0, 9) |
| ctx.line_to(9, 0) |
| ctx.move_to(1, 10) |
| ctx.line_to(10, 1) |
| ctx.move_to(0, 1) |
| ctx.line_to(1, 0) |
| ctx.move_to(9, 10) |
| ctx.line_to(10, 9) |
| ctx.stroke() |
| self.lhatch = cairo.SurfacePattern(lhatch) |
|
|
| def draw(self, ctx, page_w, page_h): |
|
|
| """ |
| Draws a component. Mainly calls supporting functions. |
| |
| The drawing page class will call this function, which |
| in turn calls draw_component(), which should be overridden |
| by subclasses to provide drawing functionality for that |
| specific component. |
| |
| Subclasses should not normally override draw() itself. |
| |
| Arguments: |
| ctx -- a Pycairo context |
| page_w, page_h -- width and height of drawing area |
| |
| Returns the scale factor of the drawn component, which is |
| then used to show the scale on the page. |
| """ |
|
|
| ctx.save() |
|
|
| self.draw_pre_scale(ctx, page_w, page_h) |
|
|
| self.set_scale(ctx, page_w, page_h) |
|
|
| ctx.set_source_rgb(*self.drawing_line_color) |
| ctx.set_line_width(self.drawing_line_width) |
|
|
| self.draw_component(ctx, page_w, page_h) |
|
|
| ctx.restore() |
|
|
| return self.scale |
|
|
| def draw_pre_scale(self, ctx, page_w, page_h): |
|
|
| """ |
| Drawing actions to perform prior to scaling. |
| |
| Subclasses should override this if desired. |
| """ |
|
|
| pass |
|
|
| def set_scale(self, ctx, page_w, page_h): |
|
|
| """ |
| Automatically sets a scale factor for the drawing. |
| |
| Subclasses should override this and call their |
| parent class set_scale() function at the end of |
| their own. 'page_h' and 'page_w' should already have been |
| up-scaled by the time this happens and we get here. |
| |
| Arguments: |
| ctx -- a Pycairo context |
| page_w, page_h -- height and width of the drawing area |
| """ |
|
|
| |
|
|
| for dims in range(len(self.dash_style)): |
| self.dash_style[dims] /= self.scale |
|
|
| |
|
|
| for key in self.text.iterkeys(): |
| self.text[key].size /= self.scale |
| self.text[key].padding /= self.scale |
|
|
| |
|
|
| self.drawing_line_width /= self.scale |
|
|
| def draw_component(self, ctx, page_w, page_h): |
|
|
| """ |
| Draws the drawn component. |
| |
| Subclasses should override this method and not call this. |
| |
| Arguments: |
| ctx -- a Pycairo context |
| page_w, page_h -- width and height of drawing area |
| """ |
|
|
| ctx.save() |
|
|
| notice = "Override this base class" |
| draw_text_box(ctx=ctx, labels=[notice], textinfo=self.text["notice"], |
| centerpoint=Point(page_w / 2, page_h / 2), noborder=True) |
| ctx.restore() |
|
|
