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#ifndef ROTOR_NODES_DRAWING
#define ROTOR_NODES_DRAWING
#include "rotor.h"
#include <cairo.h>
namespace Rotor {
class Draw_node: public Image_node {
public:
Draw_node(){
create_image_input("image input","Image input");
//no title or description as it isn't intended for the user
};
Draw_node(map<string,string> &settings):Draw_node() {
};
~Draw_node(){};
Draw_node* clone(map<string,string> &_settings) { return new Draw_node(_settings);};
virtual void vector_output(cairo_t * cr,const Frame_spec &frame){};
Image *output(const Frame_spec &frame){
Image *in=image_inputs[0]->get(frame);
if (in){
image=(*in);
}
else image.clear();
//convert to 32 bit - this can probably be optimised further
cv::Mat chans;
cv::cvtColor(image.rgb, chans, CV_BGR2RGBA, 4);
cairo_surface_t * cs = cairo_image_surface_create_for_data (chans.data,
CAIRO_FORMAT_RGB24,
image.w,
image.h,
image.w*4);
cairo_t * cr = cairo_create (cs);
//do any kind of vector drawing
vector_output(cr,frame);
//convert frame back to 24 bits
cv::cvtColor(chans,image.rgb,CV_RGBA2BGR,3);
cairo_destroy(cr);
cairo_surface_destroy(cs);
return ℑ
}
private:
};
class Hello_draw: public Draw_node {
public:
Hello_draw(){
//no title or description as it isn't intended for the user
};
Hello_draw(map<string,string> &settings) {
base_settings(settings);
};
~Hello_draw(){};
Hello_draw* clone(map<string,string> &_settings) { return new Hello_draw(_settings);};
void vector_output(cairo_t * cr,const Frame_spec &frame){
cairo_text_extents_t te;
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
cairo_select_font_face (cr, "Georgia",
CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 50);
cairo_text_extents(cr, "hello, world!", &te);
cairo_move_to (cr,(frame.w-te.width)/2,(frame.h-te.height)/2);
cairo_show_text (cr, "hello, world!");
cairo_fill(cr);
}
private:
};
#define SHAPE_circle 1
#define SHAPE_square 2
#define SHAPE_triangle 3
class Shape: public Draw_node {
public:
Shape(){
title="Shape";
description="Draws filled shapes";
create_parameter("x","number","X coordinate","X",0.0f);
create_parameter("y","number","Y coordinate","Y",0.0f);
create_parameter("scale","number","Scale","Scale",1.0f);
create_parameter("rotation","number","Rotation","Rotation",0.0f);
create_attribute("colour","Colour to fill","Colour","FFFFFF");
create_attribute("shape","Shape to draw","Shape","square",{"circle","square","triangle"});
};
Shape(map<string,string> &settings):Shape() {
base_settings(settings);
colour=Colour(attributes["colour"]->value);
};
~Shape(){};
Shape* clone(map<string,string> &_settings) { return new Shape(_settings);};
void vector_output(cairo_t * cr,const Frame_spec &frame){
cairo_set_source_rgb(cr, colour.Rfloat(),colour.Gfloat(),colour.Bfloat());
cairo_save(cr); //not really even necessary?
cairo_translate(cr, frame.w/2, frame.h/2);
cairo_translate(cr, parameters["x"]->value * frame.w, parameters["y"]->value * frame.h);
cairo_scale(cr, parameters["scale"]->value , parameters["scale"]->value );
cairo_rotate(cr,(parameters["rotation"]->value/180.0f)*M_PI);
switch(attributes["shape"]->intVal) {
case SHAPE_square:
cairo_rectangle(cr,-frame.w/2,-frame.w/2,frame.w,frame.w);
break;
case SHAPE_circle:
cairo_arc(cr,0,0,frame.w/2,0.0, 2 * M_PI);
break;
case SHAPE_triangle:
//subtracting PI/2 =(1.5*PI)/3 so the triangle is pointing up
cairo_line_to(cr,0,-frame.w/2);
cairo_line_to(cr,cos((0.5 * M_PI)/3)*frame.w/2,sin((0.5 * M_PI)/3)*frame.w/2);
cairo_line_to(cr,cos((2.5 * M_PI)/3)*frame.w/2,sin((2.5 * M_PI)/3)*frame.w/2);
cairo_close_path(cr);
break;
}
cairo_restore (cr); //not really even necessary?
cairo_fill(cr);
}
private:
Colour colour;
};
}
#endif
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