Esempi in C++ (Cpp) per grid_rasterizer::line_to_d

Esempio n. 1

File: test.cpp Progetto: springmeyer/grid_renderer

void draw_line(agg::grid_rasterizer& ras,
               double x1, double y1, 
               double x2, double y2,
               double width)
{

    double dx = x2 - x1;
    double dy = y2 - y1;
    double d = sqrt(dx*dx + dy*dy);
    
    dx = width * (y2 - y1) / d;
    dy = width * (x2 - x1) / d;

    ras.move_to_d(x1 - dx,  y1 + dy);
    ras.line_to_d(x2 - dx,  y2 + dy);
    ras.line_to_d(x2 + dx,  y2 - dy);
    ras.line_to_d(x1 + dx,  y1 - dy);
}

Esempio n. 2

File: wrapper.cpp Progetto: fredleefarr/UTFGrid-Renderer

void draw_ellipse(agg::grid_rasterizer& ras,
                  double x,  double y,
                  double rx, double ry)
{
    int i;
    ras.move_to_d(x + rx, y);
    for(i = 1; i < 360; i++)
    {
        double a = double(i) * 3.1415926 / 180.0;
        ras.line_to_d(x + cos(a) * rx, y + sin(a) * ry);
    }
}

Esempio n. 3

File: test.cpp Progetto: springmeyer/grid_renderer

void draw_ellipse(agg::grid_rasterizer& ras,
                  double x,  double y,
                  double rx, double ry)
{
    int i;
    ras.move_to_d(x + rx, y);

    // Here we have a fixed number of approximation steps, namely 360
    // while in reality it's supposed to be smarter.
    for(i = 1; i < 360; i++)
    {
        double a = double(i) * 3.1415926 / 180.0;
        ras.line_to_d(x + cos(a) * rx, y + sin(a) * ry);
    }
}