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package imaging.filters;
import java.awt.image.*;
public class RotateFilter extends SpatialFilter
{
private double angle_;
private int rotx_, roty_;
private int rotheight_, rotwidth_;
public RotateFilter ()
{
this.angle_ = 90.0;
}
public RotateFilter(double angle)
{
this.angle_ = angle;
}
public String info ()
{
return "Rotates an image";
}
public void setDimensions(int width, int height)
{
DoublePoint temp;
rows_ = height;
columns_ = width;
// Convert the angle into radians
double rotrad = angle_ * Math.PI / (double)180.0;
// Compute the corner points after rotation
double center_x = (double)(columns_ - 1) / (double)2.0;
double center_y = (double)(rows_ - 1) / (double)2.0;
// The new top left corner
temp = rotatePoint(0, 0, center_x, center_y, rotrad);
int rtl_x = (int)(temp.x_ + ((temp.x_ < 0) ? -0.5 : 0.5));
int rtl_y = (int)(temp.y_ + ((temp.y_ < 0) ? -0.5 : 0.5));
// the new top right corner
temp = rotatePoint(0, rows_, center_x, center_y, rotrad);
int rtr_x = (int)(temp.x_ + ((temp.x_ < 0) ? -0.5 : 0.5));
int rtr_y = (int)(temp.y_ + ((temp.y_ < 0) ? -0.5 : 0.5));
// the new bottom left corner
temp = rotatePoint(columns_, 0, center_x, center_y, rotrad);
int rbl_x = (int)(temp.x_ + ((temp.x_ < 0) ? -0.5 : 0.5));
int rbl_y = (int)(temp.y_ + ((temp.y_ < 0) ? -0.5 : 0.5));
// the new bottom right corner
temp = rotatePoint(columns_, rows_, center_x, center_y, rotrad);
int rbr_x = (int)(temp.x_ + ((temp.x_ < 0) ? -0.5 : 0.5));
int rbr_y = (int)(temp.y_ + ((temp.y_ < 0) ? -0.5 : 0.5));
//System.out.println(" ( " + center_x + "," + center_y + " ) ");
//System.out.println(" ( " + rtl_x + "," + rtl_y + " ) ");
//System.out.println(" ( " + rtr_x + "," + rtr_y + " ) ");
//System.out.println(" ( " + rbr_x + "," + rbr_y + " ) ");
//System.out.println(" ( " + rbl_x + "," + rbl_y + " ) ");
// rotated bounding box
int rbbx1, rbby1;
int rbbx = rbbx1 = rtl_x;
int rbby = rbby1 = rtl_y;
if (rtr_x < rbbx) rbbx = rtr_x;
if (rtr_x > rbbx1) rbbx1 = rtr_x;
if (rtr_y < rbby) rbby = rtr_y;
if (rtr_y > rbby1) rbby1 = rtr_y;
if (rbl_x < rbbx) rbbx = rbl_x;
if (rbl_x > rbbx1) rbbx1 = rbl_x;
if (rbl_y < rbby) rbby = rbl_y;
if (rbl_y > rbby1) rbby1 = rbl_y;
if (rbr_x < rbbx) rbbx = rbr_x;
if (rbr_x > rbbx1) rbbx1 = rbr_x;
if (rbr_y < rbby) rbby = rbr_y;
if (rbr_y > rbby1) rbby1 = rbr_y;
int rbbw = rbbx1 - rbbx;
int rbbh = rbby1 - rbby;
//System.out.println("(rbbx, rbby): " + rbbx + " " + rbby);
//System.out.println("(rbbx1, rbby1): " + rbbx1 + " " + rbby1);
//System.out.println("(rbbw, rbbh): " + rbbw + " " + rbbh);
//rbbx--; rbby--; rbbw+=2; rbbh+=2;
// Ensure we haven't increased the size of the image
/*
int x = rbbx + rbbw - 1, y = rbby + rbbh - 1;
if (rbbx < 0) rbbx = 0;
if (rbbx > columns_ - 1 ) rbbx = columns_ - 1;
if (rbby < 0) rbby = 0;
if (rbby > rows_ - 1) rbby = rows_ - 1;
*/
/*
if (x < 0) x = 0;
if (x > columns_ - 1) x = columns_ - 1;
if (y < 0) y = 0;
if (y > rows_ - 1) y = rows_ - 1;
if (x < rbbx) x = rbbx;
if (y < rbby) y = rbby;
rbbw = (x - rbbx) + 1;
rbbh = (y - rbby) + 1;
*/
rotx_ = rbbx;
roty_ = rbby;
rotheight_ = rbbh;
rotwidth_ = rbbw;
//System.out.println("(rotx,roty): " + rotx_ + " " +
// roty_);
//System.out.println("(rotwidth,rotheight): " + rotwidth_ + " " +
// rotheight_);
//System.out.println("(columns,rows): " + columns_ +
// " " + rows_);
raster_ = new int[columns_*rows_];
consumer.setDimensions(rotwidth_, rotheight_);
}
public void imageComplete(int status)
{
if (status == IMAGEERROR || status == IMAGEABORTED)
{
consumer.imageComplete(status);
System.out.println("Image Error: " + status);
return;
}
// For each pixel in the dimensions of the rotated image, if the
// inverse rotation falls in the bounds of the original image. If
// it does, compute and store an appropriate color, otherwise skip
// it.
System.gc();
double xf, yf, px, py, apx, apy;
int[] pixels = new int[rotwidth_*rotheight_];
int ox, oy, ox1, oy1, index, pixel;
double cx = (columns_ - 1) / 2;
double cy = (rows_ - 1) / 2;
double rotrad = angle_ * Math.PI / 180.0, ang, d;
int p0r = 0, p0g = 0, p0b = 0,
p1r = 0, p1g = 0,p1b = 0,
p2r = 0, p2g = 0, p2b = 0,
p3r = 0, p3g = 0, p3b = 0, lcv, lcv2;
int rv,gv,bv, alpha;
double rd,gd,bd, p0wgt = 0,
p1wgt = 0, p2wgt = 0, p3wgt = 0, xfrac, yfrac;
profile_timer_.start();
lcv = roty_ + rotheight_;
lcv2 = rotx_ + rotwidth_;
for (int y = roty_, i = 0; y < lcv; y++)
{
for (int x = rotx_; x < lcv2; x++, i++)
{
// Inverse rotate the point (x,y)
// Inlining the call to rotatePoint
xf = (double)x;
yf = (double)y;
d = Math.sqrt((xf - cx) * (xf - cx) + (yf - cy) * (yf - cy));
if ((xf - cx) != 0.0)
{
ang = Math.atan((cy-yf)/(xf-cx));
if ((xf - cx) < 0)
ang += Math.PI;
}
else
{
if ((yf - cy) > 0.0)
ang = (Math.PI * 3.0) / 2;
else
ang = Math.PI / 2;
}
xf = cx + (d * Math.cos(ang - rotrad));
yf = cy - (d * Math.sin(ang - rotrad));
// end inline
// Cheat a little
if (xf < 0.0 && xf > -0.5) xf = 0.0;
if (yf < 0.0 && yf > -0.5) yf = 0.0;
ox = (int)Math.floor(xf);
oy = (int)Math.floor(yf);
if ((ox >= 0) && (oy >= 0) &&
(ox < columns_) && (oy < rows_) )
{
// The color will be a linear combination of the colors of
// the center pixel, its left or right neighbor, its top
// or bottom neighbor, and its corner neighbor. Which
// neighbors are used is determined by the position of
// the fractional part of xf, xy within the 1-unit square
// of the pixel.
/* compute px,py: fractional offset from center of pixel (x.5,y.5) */
xfrac = xf - ox; /* 0 - .9999 */
yfrac = yf - oy;
px = ((xfrac >= .5) ? (xfrac - .5) : (-.5 + xfrac));
py = ((yfrac >= .5) ? (yfrac - .5) : (-.5 + yfrac));
apx = ((px < 0) ? -px : px);
apy = ((py < 0) ? -py : py);
/* get neighbor colors: p0col, p1col, p2col, p3col */
ox1 = ox + ((px < 0.0) ? -1 : 1);
oy1 = oy + ((py < 0.0) ? -1 : 1);
index = oy * columns_ + ox;
pixel = raster_[index];
alpha = (pixel >> 24) & 0xff;
p0r = (pixel >> 16) & 0xff;
p0g = (pixel >> 8) & 0xff;
p0b = pixel & 0xff;
if (ox1 >= 0 && ox1 < columns_)
{
index = oy*columns_ + ox1;
pixel = raster_[index];
p1r = (pixel >> 16) & 0xff;
p1g = (pixel >> 8) & 0xff;
p1b = pixel & 0xff;
p1wgt = apx * (1.0 - apy);
}
else { p1r=p1g=p1b=0; p1wgt = 0.0; }
if (oy1 >= 0 && oy1 < rows_)
{
index = oy1*columns_ + ox;
pixel = raster_[index];
p2r = (pixel >> 16) & 0xff;
p2g = (pixel >> 8) & 0xff;
p2b = pixel & 0xff;
p2wgt = apx * (1.0 - apy);
}
else { p2r=p2g=p2b=0; p2wgt = 0.0; }
if (ox1 >= 0 && ox1 < columns_ &&
oy1 >= 0 && oy1 < rows_)
{
index = oy1 * columns_ + ox1;
pixel = raster_[index];
p3r = (pixel >> 16) & 0xff;
p3g = (pixel >> 8) & 0xff;
p3b = pixel & 0xff;
p3wgt = apx * (1.0 - apy);
}
else { p3r=p3g=p3b=0; p3wgt = 0.0; }
p1wgt = p1wgt * .7; /* black art */
p2wgt = p2wgt * .7;
p3wgt = p3wgt * .7;
p0wgt = 1.0 - (p1wgt + p2wgt + p3wgt);
/* okay, compute and store resulting color */
rd = p0r * p0wgt + p1r * p1wgt + p2r * p2wgt + p3r * p3wgt;
gd = p0g * p0wgt + p1g * p1wgt + p2g * p2wgt + p3g * p3wgt;
bd = p0b * p0wgt + p1b * p1wgt + p2b * p2wgt + p3b * p3wgt;
rv = (int) (rd + 0.5);
gv = (int) (gd + 0.5);
bv = (int) (bd + 0.5);
if (rv < 0) rv = 0;
if (gv < 0) gv = 0;
if (bv < 0) bv = 0 ;
if (rv > 255) rv = 255;
if (gv > 255) gv = 255;
if (bv > 255) bv = 255;
pixels[i] = (alpha << 24) | (rv << 16) | (gv << 8) | bv;
}
}
}
profile_timer_.stop();
consumer.setPixels(0, 0, rotwidth_, rotheight_, defaultRGB_,
pixels, 0, rotwidth_);
consumer.imageComplete(status);
}
private final static DoublePoint rotatePoint(int x, int y,
double cx, double cy, double rad)
{
/* rotate point x, y 'rad' radians around cx, cy, return rx, ry */
double d, xf, yf, ang, rx, ry;
xf = (double)x;
yf = (double)y;
// d = distance from the point to the center
d = Math.sqrt((xf - cx) * (xf - cx) + (yf - cy) * (yf - cy));
if ((xf - cx) != 0.0)
{
// Compute the angle between the axis and the point in radians
// using the inverse tangent function.
ang = Math.atan((cy-yf)/(xf-cx));
// If the x value falls below the axis the angle is between
// PI and 2*PI.
if ((xf - cx) < 0)
ang += Math.PI;
}
else
{
// The point is on the positive y-axis so its angle is 3/2*PI
// I'm guessing this the cooridnate system is flipped in
// screen graphics.
if ((yf - cy) > 0.0)
ang = (Math.PI * 3.0) / 2;
else
ang = Math.PI / 2;
}
rx = cx + (d * Math.cos(ang + rad));
ry = cy - (d * Math.sin(ang + rad));
return new DoublePoint(rx, ry);
}
}
class DoublePoint
{
public double x_;
public double y_;
DoublePoint(double x, double y)
{
x_ = x;
y_ = y;
}
}
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