Working with rotate preview

(bzr r15142.1.15)

1 files changed, 166 insertions, 3 deletions

diff --git a/src/display/sp-canvas.cpp b/src/display/sp-canvas.cpp
index 9201168ef..36d0b7e7c 100644
--- a/src/display/sp-canvas.cpp
+++ b/src/display/sp-canvas.cpp
@@ -27,15 +27,19 @@
 #include "helper/sp-marshal.h"
 #include <2geom/rect.h>
 #include <2geom/affine.h>
-#include "display/cairo-utils.h"
 #include "display/sp-canvas.h"
 #include "display/sp-canvas-group.h"
+#include "display/rendermode.h"
+#include "display/cairo-utils.h"
+#include "display/cairo-templates.h"
+#include "display/drawing-context.h"
+#include "display/drawing-item.h"
+#include "display/nr-filter-colormatrix.h"
+#include "display/canvas-arena.h"
 #include "preferences.h"
 #include "inkscape.h"
 #include "sodipodi-ctrlrect.h"
 #include "cms-system.h"
-#include "display/rendermode.h"
-#include "display/cairo-utils.h"
 #include "debug/gdk-event-latency-tracker.h"
 #include "desktop.h"
 #include "color.h"
@@ -1945,6 +1949,165 @@ void SPCanvas::scrollTo(double cx, double cy, unsigned int clear, bool is_scroll
     }
     addIdle();
 }
+gdouble grayscale_value_matrix[20] = {
+   0.21, 0.72, 0.072, 0, 0,
+   0.21, 0.72, 0.072, 0, 0,
+   0.21, 0.72, 0.072, 0, 0,
+   0   , 0   , 0    , 1, 0
+   };
+cairo_surface_t *surface_rotated;
+cairo_surface_t *surface_origin;
+cairo_surface_t *surface_measure;
+double start_angle = 0;
+bool started = false;
+void SPCanvas::startRotateTo(double angle)
+{
+    if (!_backing_store || started) {
+        return; 
+    }
+    start_angle = angle;
+    started = true;
+    GtkAllocation allocation;
+    gtk_widget_get_allocation(&_widget, &allocation);
+    int half_w = allocation.width/2;
+    int half_h = allocation.height/2;
+    int half_min = std::min(half_w,half_h);
+    cairo_surface_t *new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width, allocation.height);
+    cairo_t *cr = cairo_create(new_backing_store);
+    cairo_arc(cr, half_w, half_h, half_min-15, 0, 2*M_PI);
+    cairo_fill(cr);
+    cairo_set_operator(cr, CAIRO_OPERATOR_IN);
+    cairo_set_source_surface(cr, _backing_store, 0, 0);
+    cairo_paint(cr);
+    cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+    cairo_arc(cr, half_w, half_h, half_min-16, 0, 2*M_PI);
+    cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
+    cairo_stroke(cr);
+    cairo_destroy(cr);
+    surface_rotated = new_backing_store;
+    
+    cairo_surface_t *new_backing_store_measure = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width, allocation.height);
+    cr = cairo_create(new_backing_store_measure);
+    cairo_arc(cr, half_w, half_h, half_min-15, 0, 2*M_PI);
+    cairo_set_source_rgba (cr, 1, 1, 1, 0.2);
+    cairo_fill(cr);
+    cairo_translate(cr, half_w, half_h);
+    for (gint x = 0; x < 360 ; x++){
+        gint ang = 360 - x ;//+ 90;
+        if (ang > 180) {
+            ang -= 360;
+        }
+        double rot = (-180.0 + x - start_angle)*(M_PI/180.);
+        double dist = half_min-9;
+        gint inverse = 1;
+        if((x- start_angle) < 91 || (x- start_angle) > 270) {
+            inverse = -1;
+        }
+        if(x%10 == 0) {
+            cairo_rotate(cr, -rot);
+            cairo_select_font_face(cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
+            cairo_set_font_size(cr, 10.0);
+            cairo_text_extents_t extents;
+            std::string s = std::to_string(ang) + "º";
+            cairo_text_extents(cr, s.c_str(), &extents);
+            //std::cout << extents.width/2 << "extents.x_bearing\n";
+            cairo_translate(cr, (extents.width/2) * inverse * -1, (dist + ((extents.height/2)* inverse)));
+            if((x- start_angle) < 91 || (x- start_angle) > 270) {
+                cairo_rotate(cr, 180*(M_PI/180.0));
+            }
+            cairo_text_path(cr, s.c_str());
+            if((x- start_angle) < 91 || (x- start_angle) > 270) {
+                cairo_rotate(cr, -180*(M_PI/180.0));
+            }
+            cairo_translate(cr, (extents.width/2) * inverse , (dist + ((extents.height/2)* inverse)) * -1);
+            cairo_set_source_rgba (cr, 1, 1, 1, 1);
+            cairo_fill(cr);
+            cairo_rotate(cr, rot);
+        }
+        cairo_rotate(cr, x*(M_PI/180.));
+        if(x%5 == 0) {
+            cairo_move_to(cr, 0, half_min-30); 
+            cairo_line_to(cr, 0, half_min-17);
+        } else { 
+            cairo_move_to(cr, 0, half_min-20);
+            cairo_line_to(cr, 0, half_min-15); 
+        }
+        cairo_line_to(cr, 0, half_min-15);
+        cairo_set_source_rgba (cr, 0, 0, 0, 0.4);
+        cairo_set_line_width (cr,1);
+        cairo_stroke(cr);
+        cairo_rotate(cr, -x*(M_PI/180.));
+    }
+    cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
+    cairo_translate(cr, -half_w, -half_h);
+    cairo_arc(cr, half_w, half_h, half_min-30, 0, 2*M_PI);
+    cairo_set_source_rgba (cr, 1, 1, 1, 1);
+    cairo_fill(cr);
+    cairo_destroy(cr);
+    surface_measure = new_backing_store_measure;
+
+    cairo_surface_t *new_backing_store_grey = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width, allocation.height);
+    cr = cairo_create(new_backing_store_grey);
+    cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+    cairo_set_source_surface(cr, _backing_store, 0, 0);
+    cairo_paint(cr);
+    Inkscape::Filters::FilterColorMatrix::ColorMatrixMatrix _grayscale_colormatrix = std::vector<gdouble> (grayscale_value_matrix, grayscale_value_matrix + 20);
+    cairo_surface_t *out = ink_cairo_surface_create_identical(new_backing_store_grey);
+    ink_cairo_surface_filter(new_backing_store_grey, out, _grayscale_colormatrix);
+    cairo_set_source_surface(cr, out, 0, 0);
+    cairo_surface_destroy(out);
+    cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+    cairo_paint(cr);
+    cairo_destroy(cr);
+    surface_origin  = new_backing_store_grey;
+
+}
+
+void SPCanvas::endRotateTo()
+{
+    if (!_backing_store) {
+        return; 
+    }
+    started = false;
+    surface_rotated = NULL;
+    surface_origin  = NULL;
+    gtk_widget_queue_draw(GTK_WIDGET(this));
+    dirtyAll();
+    addIdle();
+}
+
+void SPCanvas::rotateTo(SPCanvasItem * item, double angle)
+{
+    if (!_backing_store) {
+        return; 
+    }
+    GtkAllocation allocation;
+    gtk_widget_get_allocation(&_widget, &allocation);
+    cairo_surface_t *new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width, allocation.height);
+    cairo_t *cr = cairo_create(new_backing_store);
+    cairo_set_source_surface(cr, surface_origin, 0, 0);
+    cairo_paint(cr);
+    cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
+    cairo_paint(cr);
+    cairo_pattern_t *source_pattern;
+    cairo_matrix_t matrix;
+    source_pattern = cairo_pattern_create_for_surface (surface_rotated);
+    cairo_matrix_init_identity (&matrix);
+    cairo_matrix_translate (&matrix, allocation.width/2.0, allocation.height/2.0);
+    cairo_matrix_rotate (&matrix, Geom::rad_from_deg(angle - start_angle) * -1);
+    cairo_matrix_translate (&matrix, -allocation.width/2.0, -allocation.height/2.0);
+    cairo_pattern_set_matrix (source_pattern, &matrix);
+    cairo_set_source(cr, source_pattern);
+    cairo_paint(cr);
+    cairo_set_source_surface(cr, surface_measure, 0, 0);
+    cairo_paint(cr);
+    cairo_destroy(cr);
+    cairo_surface_destroy(_backing_store);
+    _backing_store = new_backing_store;
+    cairo_pattern_destroy (source_pattern);
+    gtk_widget_queue_draw(GTK_WIDGET(this));
+    addIdle();
+}
 
 void SPCanvas::updateNow()
 {