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//
// "$Id$"
//
// Subclassing Fl_Surface_Device and Fl_Graphics_Driver in the Fast Light Tool Kit (FLTK).
//
// Copyright 2018 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// Partial, working implementation of how to draw into an SVG file using the standard
// FLTK drawing API.
// File hello.svg is created in the current directory.
#include <FL/fl_draw.H>
#include <stdio.h>
#include <FL/Fl_Device.H>
#include <FL/Fl_Graphics_Driver.H>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
class SVG_Graphics_Driver : public Fl_Graphics_Driver {
FILE *out_;
int width_;
const char *linecap_;
uchar red_, green_, blue_;
public:
SVG_Graphics_Driver(FILE*);
~SVG_Graphics_Driver();
FILE* file() {return out_;}
protected:
const char *family_;
const char *bold_;
const char *style_;
void rect(int x, int y, int w, int h);
void rectf(int x, int y, int w, int h);
void line_style(int style, int width, char *dashes=0);
void line(int x1, int y1, int x2, int y2);
void font_(int f, int s);
void font(int f, int s);
void draw(const char *str, int n, int x, int y);
void draw(const char*, int, float, float) ;
void draw(int, const char*, int, int, int) ;
void rtl_draw(const char*, int, int, int) {}
void color(uchar r, uchar g, uchar b);
void color(Fl_Color c);
void draw_image(const uchar*, int, int, int, int, int, int) {}
void draw_image_mono(const uchar*, int, int, int, int, int, int) {}
void draw_image(void (*)(void*, int, int, int, uchar*), void*, int, int, int, int, int) {}
void draw_image_mono(void (*)(void*, int, int, int, uchar*), void*, int, int, int, int, int) {}
void draw(Fl_RGB_Image*, int, int, int, int, int, int) {}
void draw(Fl_Pixmap*, int, int, int, int, int, int) {}
void draw(Fl_Bitmap*, int, int, int, int, int, int) {}
double width(const char*, int) ;
int height() ;
int descent() ;
void push_clip(int x, int y, int w, int h) {}
void pop_clip(){}
void xyline(int x, int y, int x1){}
void xyline(int x, int y, int x1, int y2){}
void yxline(int x, int y, int y1){}
void yxline(int x, int y, int y1, int x2){}
virtual void point(int x, int y) {}
virtual void line(int x, int y, int x1, int y1, int x2, int y2) {}
virtual void xyline(int x, int y, int x1, int y2, int x3) {}
virtual void yxline(int x, int y, int y1, int x2, int y3) {}
virtual void loop(int x0, int y0, int x1, int y1, int x2, int y2) {}
virtual void loop(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3) {}
virtual void polygon(int x0, int y0, int x1, int y1, int x2, int y2) {}
virtual void polygon(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3) {}
virtual int clip_box(int x, int y, int w, int h, int &X, int &Y, int &W, int &H) {return 0;}
virtual int not_clipped(int x, int y, int w, int h) {return 0;}
virtual void push_no_clip() {}
virtual void begin_complex_polygon() {}
virtual void transformed_vertex(double xf, double yf) {}
virtual void vertex(double x, double y) {}
virtual void end_points() {}
virtual void end_line() {}
virtual void end_loop() {}
virtual void end_polygon() {}
virtual void end_complex_polygon() {}
virtual void gap() {}
virtual void circle(double x, double y, double r) {}
virtual void arc(int x, int y, int w, int h, double a1, double a2) {}
virtual void pie(int x, int y, int w, int h, double a1, double a2) {}
virtual Fl_Bitmask create_bitmask(int w, int h, const uchar *array) {return 0;}
virtual void delete_bitmask(Fl_Bitmask bm) {}
};
class SVG_File_Surface : public Fl_Surface_Device {
int width_, height_;
public:
SVG_File_Surface(int width, int height, FILE*);
int width() { return width_; }
int height() { return height_; }
~SVG_File_Surface();
};
SVG_Graphics_Driver::SVG_Graphics_Driver(FILE *f) {
out_ = f;
width_ = 1;
linecap_ = "butt";
family_ = "";
bold_ = "";
style_ = "";
red_ = green_ = blue_ = 0;
}
SVG_Graphics_Driver::~SVG_Graphics_Driver()
{
}
void SVG_Graphics_Driver::rect(int x, int y, int w, int h) {
fprintf(out_, "<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" "
"fill=\"none\" stroke=\"rgb(%u,%u,%u)\" stroke-width=\"%d\"/>\n", x, y, w, h, red_, green_, blue_, width_);
}
void SVG_Graphics_Driver::rectf(int x, int y, int w, int h) {
fprintf(out_, "<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" "
"fill=\"rgb(%u,%u,%u)\" />\n", x, y, w, h, red_, green_, blue_);
}
void SVG_Graphics_Driver::line(int x1, int y1, int x2, int y2) {
fprintf(out_,
"<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" "
"style=\"stroke:rgb(%u,%u,%u);stroke-width:%d;stroke-linecap:%s\" />\n",
x1,y1,x2,y2, red_, green_, blue_, width_, linecap_);
}
void SVG_Graphics_Driver::font_(int ft, int s) {
Fl_Graphics_Driver::font(ft, s);
int famnum = ft/4;
if (famnum == 0) family_ = "Helvetica";
else if (famnum == 1) family_ = "Courier";
else family_ = "Times";
int modulo = ft % 4;
int use_bold = modulo == 1 || modulo == 3;
int use_italic = modulo >= 2;
bold_ = ( use_bold ? " font-weight=\"bold\"" : "" );
style_ = ( use_italic ? " font-style=\"italic\"" : "" );
if (use_italic && famnum != 2) style_ = " font-style=\"oblique\"";
}
void SVG_Graphics_Driver::font(int ft, int s) {
Fl_Display_Device::display_device()->driver()->font(ft, s);
font_(ft, s);
}
void SVG_Graphics_Driver::line_style(int style, int width, char *dashes) {
if (width == 0) width = 1;
width_ = width;
if (style & FL_CAP_SQUARE) linecap_ = "square";
if (style & FL_CAP_ROUND) linecap_ = "round";
else linecap_ = "butt";
}
void SVG_Graphics_Driver::draw(const char *str, int n, int x, int y) {
// Caution: Internet Explorer ignores the xml:space="preserve" attribute
// work-around: replace all spaces by no-break space = U+00A0 = 0xC2-0xA0 (UTF-8) before sending to IE
fprintf(out_, "<text x=\"%d\" y=\"%d\" font-family=\"%s\"%s%s font-size=\"%d\" "
"xml:space=\"preserve\" "
" fill=\"rgb(%u,%u,%u)\" textLength=\"%d\">%.*s</text>\n",x, y, family_, bold_, style_, size(), red_, green_, blue_, (int)width(str, n), n, str);
}
void SVG_Graphics_Driver::draw(const char* str, int n, float fx, float fy) {
return draw(str, n, (int)fx, (int)fy);
}
void SVG_Graphics_Driver::draw(int angle, const char* str, int n, int x, int y) {
fprintf(out_, "<g transform=\"translate(%d,%d) rotate(%d)\">", x, y, -angle);
draw(str, n, 0, 0);
fputs("</g>\n", out_);
}
void SVG_Graphics_Driver::color(Fl_Color c) {
Fl_Graphics_Driver::color(c);
Fl::get_color(c, red_, green_, blue_);
}
void SVG_Graphics_Driver::color(uchar r, uchar g, uchar b) {
red_ = r;
green_ = g;
blue_ = b;
}
double SVG_Graphics_Driver::width(const char* str, int l) {
return Fl_Display_Device::display_device()->driver()->width(str, l);
}
int SVG_Graphics_Driver::height() {
return Fl_Display_Device::display_device()->driver()->height();
}
int SVG_Graphics_Driver::descent() {
return Fl_Display_Device::display_device()->driver()->descent();
}
SVG_File_Surface::SVG_File_Surface(int w, int h, FILE *f) : Fl_Surface_Device(NULL) {
fprintf(f,
"<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n"
"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \n"
"\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n"
"<svg width=\"%dpx\" height=\"%dpx\" viewBox=\"0 0 %d %d\"\n"
"xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\">\n", w, h, w, h);
width_ = w; height_ = h;
driver(new SVG_Graphics_Driver(f));
}
SVG_File_Surface::~SVG_File_Surface() {
SVG_Graphics_Driver *driver = (SVG_Graphics_Driver*)this->driver();
fputs("</svg>\n", driver->file());
fflush(driver->file());
delete driver;
}
int main(int argc, char **argv) {
Fl_Window *window = new Fl_Window(340,180);
Fl_Box *box = new Fl_Box(20,40,300,100,"Hello, World!");
box->box(FL_UP_BOX);
box->labelfont(FL_BOLD+FL_ITALIC);
box->labelsize(36);
box->labeltype(FL_SHADOW_LABEL);
window->end();
window->show(argc, argv);
FILE *out = fl_fopen("hello.svg", "w");
if (out) {
SVG_File_Surface *svg = new SVG_File_Surface(box->w(), box->h(), out);
Fl_Surface_Device::push_current(svg);
fl_color(box->color());
fl_rectf(0, 0, box->w(), box->h());
fl_font(box->labelfont(), 36);
fl_color(box->labelcolor());
fl_draw(box->label(), 5, 50);
Fl_Surface_Device::pop_current();
delete svg;
fclose(out);
}
return Fl::run();
}
//
// End of "$Id$".
//
|
