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)
}
}
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
}
}
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
}
func (self *Surface) SetSourceRGB(red, green, blue float64) {
C.cairo_set_source_rgb(self.context, C.double(red), C.double(green), C.double(blue))
}
// 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))
}