我正在尝试在 Java 中实现 DDA 算法来画一条线。Line Rasterizer 实现了一个接口。然后我rasterizeLine在名为的类中调用函数Canva。LineRasterizes 成功获得 x 和 y 点。没有错误被抛出，但是算法必须存在一些逻辑问题，因为没有绘制线。你能帮我找出逻辑错误吗？
界面
package rasterops;
import rasterdata.RasterImage;
public interface LineRasterizer<PixelType> {
RasterImage<PixelType> rasterizeLine(RasterImage<PixelType> img,
double x1, double y1, double x2, double y2,
PixelType value);
}
线光栅化器
package rasterops;
import rasterdata.RasterImage;
public class LineRasterizerDDA<PixelType> implements LineRasterizer <PixelType> {
@Override
public RasterImage<PixelType> rasterizeLine(RasterImage<PixelType> img, double x1, double y1, double x2, double y2, PixelType value) {
double dy = y2-y1;
double dx = x2-x1;
double k = dy/dx;
double y = y1;
RasterImage<PixelType> result = img;
for( double x = x1; x <= x2; x++ ){
result = result.withPixel((int)x, (int)Math.round(y), value);
y = y1 + k;
}
return result;
}
}
Canva - 调用函数
panel.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
previousX = e.getX();
previousY = e.getY();
}
});
panel.addMouseMotionListener(new MouseAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
final double startX = previousX / (panel.getWidth() - 1.0); //k zamysleni: proc 1.0 a ne 1?
final double startY = 1 - previousY / (panel.getHeight() - 1.0);
final double endX = e.getX() / (panel.getWidth() - 1.0);
final double endY = 1 - e.getY() / (panel.getHeight() - 1.0);
clear(); // zkuste zakomentovat
rasterImage = liner.rasterizeLine(rasterImage,
startX, startY, endX, endY,
0xffff00);
panel.repaint();
}
});