void GraphicWindow::line(double xfrom, double yfrom, double xto,
double yto)
{
XSetForeground(display, xgc, BlackPixel(display, screen_num));
XDrawLine(display, win, xgc, user_to_disp_x(xfrom), user_to_disp_y(yfrom),
user_to_disp_x(xto), user_to_disp_y(yto));
XDrawLine(display, _ppm, xgc, user_to_disp_x(xfrom),
user_to_disp_y(yfrom), user_to_disp_x(xto), user_to_disp_y(yto));
}
void GraphicWindow::text(string t, double x, double y)
{
int dx = user_to_disp_x(x);
int dy = user_to_disp_y(y);
for (int i = 0; i < t.length(); i++) set(dx + i, dy, t[i]);
dirty = true;
}
void GraphicWindow::point(double x, double y)
{
int cx = user_to_disp_x(x);
int cy = user_to_disp_y(y);
set(cx, cy);
dirty = true;
}
void GraphicWindow::line(double xfrom, double yfrom, double xto, double yto)
{
int x1 = user_to_disp_x(xfrom);
int x2 = user_to_disp_x(xto);
int y1 = user_to_disp_y(yfrom);
int y2 = user_to_disp_y(yto);
int dx = x2 - x1;
int dy = y2 - y1;
if (abs(dy) < abs(dx)) // |slope| < 1
{
if (dx < 0)
{
int temp = x1; x1 = x2; x2 = temp;
temp = y1; y1 = y2; y2 = temp;
dx = -dx; dy = -dy;
}
double y = y1 + 0.5;
for (int x = x1; x != x2; x++)
{
set(x, int(y));
y += double(dy) / double(dx);
}
}
else
{
if (dy < 0)
{
int temp = x1; x1 = x2; x2 = temp;
temp = y1; y1 = y2; y2 = temp;
dx = -dx; dy = -dy;
}
double x = x1 + 0.5;
for (int y = y1; y != y2; y++)
{
set(int(x), y);
x += double(dx) / double(dy);
}
}
set(x2, y2);
dirty = true;
}
void GraphicWindow::point(double x, double y)
{
const int POINT_RADIUS = 3;
int disp_x = user_to_disp_x(x);
int disp_y = user_to_disp_y(y);
XSetForeground(display, xgc, BlackPixel(display, screen_num));
XDrawArc(display, win, xgc, disp_x - POINT_RADIUS, disp_y - POINT_RADIUS,
2 * POINT_RADIUS, 2 * POINT_RADIUS, 0 , 360 * 64);
XDrawArc(display, _ppm, xgc, disp_x - POINT_RADIUS,
disp_y - POINT_RADIUS, 2 * POINT_RADIUS, 2 * POINT_RADIUS, 0 , 360 * 64);
}
void GraphicWindow::text(const char t[], double x, double y)
{
int direction, ascent, descent;
XCharStruct overall;
XTextExtents(_fontinfo_ptr, t, strlen(t), &direction, &ascent, &descent, &overall);
int disp_x = user_to_disp_x(x);
int disp_y = user_to_disp_y(y) + ascent;
XSetForeground(display, xgc, BlackPixel(display, screen_num));
XDrawString(display, win, xgc, disp_x, disp_y, t, strlen(t));
XDrawString(display, _ppm, xgc, disp_x, disp_y,
t, strlen(t));
}
void GraphicWindow::ellipse(double center_x, double center_y, double ra, double rb)
{
int cx = user_to_disp_x(center_x);
int cy = user_to_disp_y(center_y);
double a = fabs(user_to_disp_dx(ra));
double b = fabs(user_to_disp_dy(rb));
int x = 0;
int y = (int)(b + 0.5);
double d1 = b * b - a * a * b + a * a / 4;
set4(x, y, cx, cy);
while (a * a * (y - 0.5) > b * b * (x + 1))
{
if (d1 < 0)
{
d1 += b * b * (2 * x + 3);
x++;
}
else
{
d1 += b * b * (2 * x + 3) + a * a * (-2 * y + 2);
x++;
y--;
}
set4(x, y, cx, cy);
}
double d2 = b * b * (x + 0.5) * (x + 0.5) + a * a * (y - 1) * (y - 1) - a * a * b * b;
while (y > 0)
{
if (d2 < 0)
{
d2 += b * b * (2 * x + 2) + a * a * (-2 * y + 3);
x++;
y--;
}
else
{
d2 += a * a * (-2 * y + 3);
y--;
}
set4(x, y, cx, cy);
}
dirty = true;
}
void GraphicWindow::ellipse(double x, double y, double ra, double rb)
{
int disp_x = user_to_disp_x(x);
int disp_y = user_to_disp_y(y);
int disp_rx = abs(user_to_disp_dx(ra));
int disp_ry = abs(user_to_disp_dy(rb));
XSetForeground(display, xgc, BlackPixel(display, screen_num));
XDrawArc(display, win,
xgc, // the drawable
disp_x - disp_rx, // the x coord of upperleft corner of bounding rect
disp_y - disp_ry, // the y coord of upperleft corner of bounding rect
disp_rx * 2, // the major axis length
disp_ry * 2, // the minor axis length
0, // offset from 3 o'clock
360 * 64); // complete circle (360 degrees * 64 clicks per degree)
XDrawArc(display, _ppm, xgc, disp_x - disp_rx,
disp_y - disp_ry, disp_rx * 2, disp_ry * 2, 0, 360 * 64);
}
