Anonymous user
Xiaolin Wu's line algorithm: Difference between revisions
+ C# implemented code
m (→{{header|FreeBASIC}}: removed redundant code) |
(+ C# implemented code) |
||
Line 282:
#undef round_
#undef rfpart_</lang>
== {{header|C#}} ==
<lang c>
public class Line
{
private double x0, y0, x1, y1;
private Color foreColor;
private byte lineStyleMask;
private int thickness;
private float globalm;
public Line(double x0, double y0, double x1, double y1, Color color, byte lineStyleMask, int thickness)
{
this.x0 = x0;
this.y0 = y0;
this.y1 = y1;
this.x1 = x1;
this.foreColor = color;
this.lineStyleMask = lineStyleMask;
this.thickness = thickness;
}
private void plot(Bitmap bitmap, double x, double y, double c)
{
int alpha = (int)(c * 255);
if (alpha > 255) alpha = 255;
if (alpha < 0) alpha = 0;
Color color = Color.FromArgb(alpha, foreColor);
if (BitmapDrawHelper.checkIfInside((int)x, (int)y, bitmap))
{
bitmap.SetPixel((int)x, (int)y, color);
}
}
int ipart(double x) { return (int)x;}
int round(double x) {return ipart(x+0.5);}
double fpart(double x) {
if(x<0) return (1-(x-Math.Floor(x)));
return (x-Math.Floor(x));
}
double rfpart(double x) {
return 1-fpart(x);
}
public void draw(Bitmap bitmap) {
bool steep = Math.Abs(y1-y0)>Math.Abs(x1-x0);
double temp;
if(steep){
temp=x0; x0=y0; y0=temp;
temp=x1;x1=y1;y1=temp;
}
if(x0>x1){
temp = x0;x0=x1;x1=temp;
temp = y0;y0=y1;y1=temp;
}
double dx = x1-x0;
double dy = y1-y0;
double gradient = dy/dx;
double xEnd = round(x0);
double yEnd = y0+gradient*(xEnd-x0);
double xGap = rfpart(x0+0.5);
double xPixel1 = xEnd;
double yPixel1 = ipart(yEnd);
if(steep){
plot(bitmap, yPixel1, xPixel1, rfpart(yEnd)*xGap);
plot(bitmap, yPixel1+1, xPixel1, fpart(yEnd)*xGap);
}else{
plot(bitmap, xPixel1,yPixel1, rfpart(yEnd)*xGap);
plot(bitmap, xPixel1, yPixel1+1, fpart(yEnd)*xGap);
}
double intery = yEnd+gradient;
xEnd = round(x1);
yEnd = y1+gradient*(xEnd-x1);
xGap = fpart(x1+0.5);
double xPixel2 = xEnd;
double yPixel2 = ipart(yEnd);
if(steep){
plot(bitmap, yPixel2, xPixel2, rfpart(yEnd)*xGap);
plot(bitmap, yPixel2+1, xPixel2, fpart(yEnd)*xGap);
}else{
plot(bitmap, xPixel2, yPixel2, rfpart(yEnd)*xGap);
plot(bitmap, xPixel2, yPixel2+1, fpart(yEnd)*xGap);
}
if(steep){
for(int x=(int)(xPixel1+1);x<=xPixel2-1;x++){
plot(bitmap, ipart(intery), x, rfpart(intery));
plot(bitmap, ipart(intery)+1, x, fpart(intery));
intery+=gradient;
}
}else{
for(int x=(int)(xPixel1+1);x<=xPixel2-1;x++){
plot(bitmap, x,ipart(intery), rfpart(intery));
plot(bitmap, x, ipart(intery)+1, fpart(intery));
intery+=gradient;
}
}
}
}
</lang>
=={{header|D}}==
| |||