Beispiel #1
0
func draw_selections(viewp, bufferp, crp unsafe.Pointer, mark_pairs []unsafe.Pointer) {
	view := (*C.GtkTextView)(viewp)
	buffer := (*C.GtkTextBuffer)(bufferp)
	cr := (*C.cairo_t)(crp)
	var alloc C.GtkAllocation
	C.gtk_widget_get_allocation((*C.GtkWidget)(viewp), &alloc)
	n := len(mark_pairs)
	var start_mark, stop_mark *C.GtkTextMark
	var location C.GdkRectangle
	var iter C.GtkTextIter
	var x, y C.gint
	var dx, dy C.double
	for i := 0; i < n; i += 2 {
		start_mark = (*C.GtkTextMark)(mark_pairs[i])
		C.gtk_text_buffer_get_iter_at_mark(buffer, &iter, start_mark)
		C.gtk_text_view_get_iter_location(view, &iter, &location)
		C.gtk_text_view_buffer_to_window_coords(view, C.GTK_TEXT_WINDOW_WIDGET, C.gint(location.x), C.gint(location.y), &x, &y)
		if C.int(x) > alloc.width || C.int(y) > alloc.height || x < 0 || y < 0 {
			continue
		}
		dx = C.double(x)
		dy = C.double(y)

		C.cairo_set_source_rgb(cr, 1, 0, 0)
		C.cairo_move_to(cr, dx, dy)
		C.cairo_set_line_width(cr, 2)
		C.cairo_line_to(cr, dx+6, dy)
		C.cairo_stroke(cr)

		C.cairo_move_to(cr, dx, dy)
		C.cairo_set_line_width(cr, 1)
		C.cairo_line_to(cr, dx, dy+C.double(location.height))
		C.cairo_stroke(cr)

		stop_mark = (*C.GtkTextMark)(mark_pairs[i+1])
		C.gtk_text_buffer_get_iter_at_mark(buffer, &iter, stop_mark)
		C.gtk_text_view_get_iter_location(view, &iter, &location)
		C.gtk_text_view_buffer_to_window_coords(view, C.GTK_TEXT_WINDOW_WIDGET, C.gint(location.x), C.gint(location.y), &x, &y)
		if C.int(x) > alloc.width || C.int(y) > alloc.height || x < 0 || y < 0 {
			continue
		}
		dx = C.double(x)
		dy = C.double(y)

		C.cairo_set_source_rgb(cr, 0, 1, 0)
		C.cairo_move_to(cr, dx, dy)
		C.cairo_set_line_width(cr, 1)
		C.cairo_line_to(cr, dx, dy+C.double(location.height))
		C.cairo_stroke(cr)

		C.cairo_move_to(cr, dx, dy+C.double(location.height))
		C.cairo_set_line_width(cr, 2)
		C.cairo_line_to(cr, dx-6, dy+C.double(location.height))
		C.cairo_stroke(cr)

	}
}
Beispiel #2
0
func RedrawWindow(W *XWindow, tweetsList []*TweetInfo, mouseClick [2]int) {
	var Attribs C.XWindowAttributes
	C.XGetWindowAttributes(W.Display, W.Window, &Attribs)
	// TODO -- Do this only when resizing?
	C.cairo_xlib_surface_set_size(W.Surface, Attribs.width, Attribs.height)

	C.cairo_set_source_rgb(W.Cairo, 0.1, 0.1, 0.1)
	C.cairo_paint(W.Cairo)

	var Rect C.PangoRectangle
	yPos := 10.0 + W.Scroll

	WindowWidth := Attribs.width

	maxTweetWidth := PixelsToPango(float64(WindowWidth - 5*UIPadding - UserImageSize))

	for i := 0; i < len(tweetsList); i++ {
		t := tweetsList[i]

		C.pango_layout_set_width(t.Layout, maxTweetWidth)
		C.pango_layout_get_extents(t.Layout, nil, &Rect)

		// Get tweet text size
		_, ry, _, rh := PangoRectToPixels(&Rect)

		// Position and add padding
		ry += yPos
		if rh < UserImageSize+2*UIPadding-UIPadding {
			rh = UserImageSize + 2*UIPadding
		} else {
			rh += UIPadding
		}

		// Draw rectangle around tweet
		C.cairo_set_source_rgb(W.Cairo, 0.2, 0.2, 0.2)
		C.cairo_rectangle(W.Cairo, UIPadding, C.double(ry), C.double(WindowWidth-2*UIPadding), C.double(rh))
		C.cairo_fill(W.Cairo)
		if mouseClick[0] >= UIPadding && float64(mouseClick[1]) >= ry && float64(mouseClick[1]) <= ry+rh {
			fmt.Println("Clicked tweet", t.Text)
		}

		// Draw user image
		userImage := GetCachedImage(W.UserImages, t.UserImage)
		if userImage == nil || C.cairo_surface_status(userImage) != C.CAIRO_STATUS_SUCCESS {
			userImage = placeholderImage
		}
		C.cairo_set_source_surface(W.Cairo, userImage, 2*UIPadding, C.double(yPos+UIPadding))
		C.cairo_paint(W.Cairo)

		// Draw tweet text
		C.cairo_move_to(W.Cairo, 63, C.double(yPos+SmallPadding))
		C.cairo_set_source_rgb(W.Cairo, 0.95, 0.95, 0.95)
		C.pango_cairo_show_layout(W.Cairo, t.Layout)
		yPos += 5 + rh
	}
}
Beispiel #3
0
func (t *PDFStreamTextObject) WriteAt(text string, props TypesettingProps, x float64, y float64) error {
	var layout *C.PangoLayout
	var font_description *C.PangoFontDescription

	font_description = C.pango_font_description_new()
	cfontname := C.CString(props.Fontname)
	defer C.free(unsafe.Pointer(cfontname))
	C.pango_font_description_set_family(font_description, cfontname)
	C.pango_font_description_set_weight(font_description, C.PANGO_WEIGHT_NORMAL)
	C.pango_font_description_set_absolute_size(font_description, C.double(props.Fontsize)*C.PANGO_SCALE)

	layout = C.pango_cairo_create_layout(t.context)
	C.pango_layout_set_font_description(layout, font_description)
	width := props.PageWidth - props.LeftMargin - props.RightMargin
	fmt.Printf("width is %f\n", width)
	C.pango_layout_set_width(layout, C.int(width*C.PANGO_SCALE))
	C.pango_layout_set_justify(layout, C.TRUE)
	ctext := C.CString(text)
	defer C.free(unsafe.Pointer(ctext))
	C.pango_layout_set_text(layout, ctext, -1)

	C.cairo_set_source_rgb(t.context, 0.0, 0.0, 0.0)
	C.cairo_move_to(t.context, C.double(x), C.double(y))
	skip := props.Baselineskip
	nlines := int(C.pango_layout_get_line_count(layout))
	for i := 0; i < nlines; i++ {
		C.cairo_move_to(t.context, C.double(x), C.double(y+float64(i)*skip))
		C.pango_cairo_show_layout_line(t.context, C.pango_layout_get_line(layout, C.int(i)))
	}

	C.g_object_unref(C.gpointer(layout))
	C.pango_font_description_free(font_description)
	return nil
}
Beispiel #4
0
func (self *Surface) SetSourceRGB(red, green, blue float64) {
	C.cairo_set_source_rgb(self.context, C.double(red), C.double(green), C.double(blue))
}
Beispiel #5
0
// SetSourceRGB is a wrapper around cairo_set_source_rgb().
func (v *Context) SetSourceRGB(red, green, blue float64) {
	C.cairo_set_source_rgb(v.native(), C.double(red), C.double(green),
		C.double(blue))
}