window.c

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#include "window.h"
 
 
double  X_Dx, X_Dy, X_Wx, X_Wy;
double  X_Now = 0.0, Y_Now = 0.0;
 
 
void  setWindow(WSGraph vp, double x1, double y1, double x2, double y2)
{
    if (x1==x2 || y1==y2) return;
 
    X_Dx = (vp.xs - 1)/Xabs(x2 - x1);
    X_Dy = (vp.ys - 1)/Xabs(y2 - y1);
    X_Wx = Min(x1, x2);
    X_Wy = Max(y1, y2);
}
 
 
void  wSetPixel(WSGraph vp, double x, double y, int cc)
{
    int  i, j;
 
    i = (int)((x - X_Wx)*X_Dx + 0.5);
    j = (int)((X_Wy - y)*X_Dy + 0.5);
 
    SetPixel(vp, i, j, cc);
}
 
 
int  wGetPixel(WSGraph vp, double x, double y)
{
    int  i, j;
 
    i = (int)((x - X_Wx)*X_Dx + 0.5);
    j = (int)((X_Wy - y)*X_Dy + 0.5);
 
    return GetPixel(vp, i, j);
}
 
 
void  wLine(WSGraph vp, double x1, double y1, double x2, double y2, int cc)
{
    int  i1, j1, i2, j2;
 
    i1 = (int)((x1 - X_Wx)*X_Dx + 0.5);
    i2 = (int)((x2 - X_Wx)*X_Dx + 0.5);
    j1 = (int)((X_Wy - y1)*X_Dy + 0.5);
    j2 = (int)((X_Wy - y2)*X_Dy + 0.5);
 
    line(vp, i1, j1, i2, j2, cc);
}
 
 
void  wMove(double x1, double y1) 
{
    X_Now = x1;
    Y_Now = y1;
}
 
 
void  wDraw(WSGraph vp, double x1, double y1, int cc)
{
    wLine(vp, X_Now, Y_Now, x1, y1, cc);
 
    X_Now = x1;
    Y_Now = y1;
}
 
 
void  wMove_Rel(double x1, double y1) 
{
    X_Now += x1;
    Y_Now += y1;
}
 
 
void  wDraw_Rel(WSGraph vp, double x1, double y1, int cc)
{
    double x2, y2;
 
    x2 = X_Now + x1;
    y2 = Y_Now + y1;
 
    wLine(vp, X_Now, Y_Now, x2, y2, cc);
 
    X_Now = x2;
    Y_Now = y2;
}