// draw function point
void set_point ( float_t x_real, float_t y_real )
{
if ((x_real> window_left) & (x_real < window_right) & (y_real > window_down) & (y_real <window_up))
{
Text_Foreground_Color( COLOR_WHITE );
Draw_Line( scale_x( x_real ), scale_y( y_real ), scale_x( x_real ), scale_y( y_real ) );
RAIO_StartDrawing( LINE );
}
}
void Plotter::draw_line(double x1, double y1, double x2, double y2) {
//Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);
cr->move_to (scale_x(x1), scale_y(y1));
cr->line_to (scale_x(x2), scale_y(y2));
cr->stroke();
cr->save();
}
void Plotter::draw_point(double x, double y) {
//Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);
cr->arc(scale_x(x), scale_y(y),
POINT_RES, 0.0, 2.0 * M_PI);
cr->stroke();
}
int main()
{
int Iteration;
const int IterationMax=200;
/* write header */
printf("P6\n%d\n%d\n%d\n",
size_x,size_y,max_color_component_value);
/* compute and write image data bytes to the file*/
for(int i_y=0; i_y < size_y ;i_y++)
{
for(int i_x=0; i_x < size_x ;i_x++){
double x0 = scale_x( i_x );
double y0 = scale_y( i_y );
double x = 0.0;
double y = 0.0;
// printf("%f,%f\n",x0,y0 );
int iteration = 0;
while (( (x*x + y*y) < 4 )&&( iteration < max_iteration )){
/* printf( "\nx= */
double xtemp = x*x - y*y + x0;
y = 2*x*y + y0;
x = xtemp;
++iteration;
}
char r,g,b;
color_for_iteration( &r, &g, &b, iteration );
printf( "%c%c%c", r, g, b );
}
}
return 0;
}
void example_DrawFunction( int16_t function )
{
float_t x_real, y_real;
int16_t count;
RAIO_clear_screen();
// draw x-axis
draw_coords_line ( window_left, 0, window_right, 0 );
for( count = (int16_t)window_left; count < (int16_t)window_right; count++ )
{
Draw_Line ( scale_x( count ), scale_y( window_up*0.01 ), scale_x( count ), scale_y( window_down*0.01 ) );
Text_Foreground_Color ( COLOR_WHITE );
RAIO_StartDrawing ( LINE );
}
// draw y-axis
draw_coords_line ( 0, window_up, 0, window_down );
for( count = (int16_t)window_down; count < (int16_t)window_up; count++ )
{
Draw_Line ( scale_x( window_left*0.01 ), scale_y( count ), scale_x( window_right*0.01 ), scale_y( count ) );
Text_Foreground_Color ( COLOR_WHITE );
RAIO_StartDrawing ( LINE );
}
// draw function
for( x_real = window_left; x_real < window_right; x_real=x_real+0.02 )
{
switch (function) // -> see FUNCTIONS
{
case SIN: y_real = sin( x_real ); break;
case COS: y_real = cos( x_real ); break;
case TAN: y_real = tan( x_real ); break;
case PARABOLA: y_real = x_real * x_real; break;
case EXPONENT: y_real = exp( x_real ); break;
case LOGN : y_real = log( x_real ); break;
default: break;
};
set_point( x_real, y_real);
}
}
// draw coordinate system
void draw_coords_line (float_t x1, float_t y1, float_t x2, float_t y2)
{
Text_Foreground_Color( COLOR_WHITE );
Draw_Line( scale_x( x1 ), scale_y( y1 ), scale_x( x2 ), scale_y( y2 ) );
RAIO_StartDrawing( LINE );
}
