我想知道如何为立方体指定z方向。需要沿z方向将其转换为-5。 整个问题陈述是这样的：通过在3d空间中定义一个多维数据集，在坐标系的原点设置一个摄影机以及一个具有90°FOV的投影矩阵，来实现转换管道。多维数据集大小应为2个单位（2x2x2），沿负z轴放置5个单位 包转换；
import java.util.*;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
public class Transformations {
//declare list of polygons
static ArrayList<Integer>p_left=new ArrayList<Integer>();
static ArrayList<Integer>p_right=new ArrayList<Integer>();
static ArrayList<Integer>p_down=new ArrayList<Integer>();
static ArrayList<Integer>p_top=new ArrayList<Integer>();
static ArrayList<Integer>p_near=new ArrayList<Integer>();
static ArrayList<Integer>p_far=new ArrayList<Integer>();
static int count=0;
public static BufferedImage gradientSetRaster(BufferedImage img) {
int width = img.getWidth();
int height = img.getHeight();
WritableRaster raster = img.getRaster();
int[] pixel = new int[3]; //RGB
for (int y = 0; y < height; y++) {
int val = (int) (y * 255f / height);
for (int shift = 1; shift < 3; shift++) {
pixel[shift] = val;
}
for (int x = 0; x < width; x++) {
raster.setPixel(x, y, pixel);
}
}
return img;
}
public static BufferedImage drawLine(BufferedImage img, int x0, int y0, int xn, int yn)
{
WritableRaster raster=img.getRaster();
int[] pixel = new int[3]; //RGB
for(int k=0; k<3; k++)
{
pixel[k]=255;
}
int dx=Math.abs(xn-x0);
int dy=Math.abs(yn-y0);
int m=dy/dx;
int twoDy=2*dy;
int twoDyMintwoDx=twoDy-2*dx;
if(dx>dy) //slope is positive and is less than or equal to 1
{
int p=twoDy-dx;
for(int k=0; k<dx-1; k++)
{
if(p<0)
{
x0=x0+1;
raster.setPixel(x0, y0, pixel);
p=p+twoDy;
}
else
{
x0=x0+1;
y0=y0+1;
raster.setPixel(x0, y0, pixel);
p=p+twoDy-2*dx;
}
}
}
if(dy>dx)
{
int p=2*dx-dy;
int temp1=x0;
x0=y0;
y0=temp1;
int temp2=xn;
xn=yn;
yn=temp2;
for(int k=0; k<dx-1; k++)
{
x0=x0+1;
y0=y0+1;
raster.setPixel(x0, y0, pixel);
}
}
if(dy==dx)
{
x0=x0+1;
y0=y0+1;
raster.setPixel(x0, y0, pixel);
}
return img;
}
public static BufferedImage drawUpPolygon(Graphics g, BufferedImage img, ArrayList<Integer>p_top)
{
g.drawLine(p_top.get(0), p_top.get(1), p_top.get(2), p_top.get(3));
g.drawLine(p_top.get(0), p_top.get(1), p_top.get(4), p_top.get(5));
g.drawLine(p_top.get(4), p_top.get(5), p_top.get(6), p_top.get(7));
g.drawLine(p_top.get(6), p_top.get(7), p_top.get(2), p_top.get(3));
return img;
}
public static BufferedImage drawDownPolygon(Graphics g, BufferedImage img, ArrayList<Integer>p_top)
{
g.drawLine(p_down.get(0), p_down.get(1), p_down.get(2), p_down.get(3));
g.drawLine(p_down.get(0), p_down.get(1), p_down.get(4), p_down.get(5));
g.drawLine(p_down.get(4), p_down.get(5), p_down.get(6), p_down.get(7));
g.drawLine(p_down.get(6), p_down.get(7), p_down.get(2), p_down.get(3));
return img;
}
public static BufferedImage drawBetween(Graphics g, BufferedImage img, ArrayList<Integer>p_top, ArrayList<Integer>p_down)
{
g.drawLine(p_top.get(0), p_top.get(1), p_down.get(0), p_down.get(1));
g.drawLine(p_top.get(2), p_top.get(3), p_down.get(2), p_down.get(3));
g.drawLine(p_top.get(4), p_top.get(5), p_down.get(4), p_down.get(5));
g.drawLine(p_top.get(6), p_top.get(7), p_down.get(6), p_down.get(7));
return img;
}
public static void main(String... args) {
Frame w = new Frame("Raster"); //window
final int imageWidth = 500;
final int imageHeight = 500;
w.setSize(imageWidth,imageHeight);
w.setLocation(100,100);
w.setVisible(true);
Graphics g = w.getGraphics();
BufferedImage img = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
gradientSetRaster(img);
g.drawImage(img, 0, 0, (img1, infoflags, x, y, width, height) -> false); //draw the image. You can think of this as the display method.
w.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
//order will be(vertex->index)
//lowerLeft->0,1
//upperLeft->2,3
//lowerRight->4,5
//upperRight->6,7
count++;
int t_lowLeftX=e.getX();
int t_lowLeftY=e.getY();
//top polygon
int t_lowRightX;
int t_lowRightY;
int t_uppLeftX;
int t_uppLeftY;
int t_uppRightX;
int t_uppRightY;
//bottom polygon
int d_lowLeftX;
int d_lowLeftY;
int d_lowRightX;
int d_lowRightY;
int d_uppLeftX;
int d_uppLeftY;
int d_uppRightX;
int d_uppRightY;
if(count==1) {
//lowerLeft indexes
t_lowLeftX=e.getX();
t_lowLeftY=e.getY();
t_lowRightX=t_lowLeftX+100;
t_lowRightY=t_lowLeftY;
t_uppLeftX=t_lowLeftX+50;
t_uppLeftY=t_lowLeftY+50;
t_uppRightX=t_uppLeftX+100;
t_uppRightY=t_uppLeftY;
d_lowLeftX=t_lowLeftX;
d_lowLeftY=t_lowLeftY-70;
d_lowRightX=t_lowRightX;
d_lowRightY=t_lowRightY-70;
d_uppLeftX=t_uppLeftX;
d_uppLeftY=t_uppLeftY-70;
d_uppRightX=t_uppRightX;
d_uppRightY=t_uppRightY-70;
//connect(lowLeft->uppLeft, lowLeft->lowRight, uppLeft->uppRight,
//uppRight->lowRight ...)
p_top.add(t_lowLeftX);
p_top.add(t_lowLeftY);
p_top.add(t_lowRightX);
p_top.add(t_lowRightY);
p_top.add(t_uppLeftX);
p_top.add(t_uppLeftY);
p_top.add(t_uppRightX);
p_top.add(t_uppRightY);
p_down.add(d_lowLeftX);
p_down.add(d_lowLeftY);
p_down.add(d_lowRightX);
p_down.add(d_lowRightY);
p_down.add(d_uppLeftX);
p_down.add(d_uppLeftY);
p_down.add(d_uppRightX);
p_down.add(d_uppRightY);
// g.drawLine(lowLeftX, lowLeftY, uppLeftX, uppLeftY);
// g.drawLine(lowLeftX, lowLeftY, lowRightX, lowRightY);
// g.drawLine(uppLeftX, uppLeftY, uppRightX, uppRightY);
// g.drawLine(uppRightX, uppRightY, lowRightX, lowRightY);
drawUpPolygon(g, img, p_top);
drawDownPolygon(g, img, p_down);
drawBetween(g, img, p_top, p_down);
int[] pixel = {255,255,255};
img.getRaster().setPixel(t_lowLeftX,t_lowLeftY,pixel);
img.getRaster().setPixel(t_uppLeftX, t_uppLeftY,pixel);
img.getRaster().setPixel(t_lowLeftX, t_lowLeftY, pixel);
img.getRaster().setPixel(t_lowRightX, t_lowRightY, pixel);
img.getRaster().setPixel(t_uppRightX, t_uppRightY, pixel);
img.getRaster().setPixel(d_lowLeftX,d_lowLeftY,pixel);
img.getRaster().setPixel(d_uppLeftX, d_uppLeftY,pixel);
img.getRaster().setPixel(d_lowLeftX, d_lowLeftY, pixel);
img.getRaster().setPixel(d_lowRightX, d_lowRightY, pixel);
img.getRaster().setPixel(d_uppRightX, d_uppRightY, pixel);
};
//top polygon's lower left vertex
}
});
w.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
w.dispose();
g.dispose();
System.exit(0);
}
});
}
}