Java 如何从形状中减去图像的面积
这里的基本问题是,我画了一个灰度图像,是形状的矩形边界。我已经在那个矩形上画了形状。现在我需要从图像中删除访问区域 从形状获取矩形边界的代码为:Java 如何从形状中减去图像的面积,java,graphics,paint,paintcomponent,graphics2d,Java,Graphics,Paint,Paintcomponent,Graphics2d,这里的基本问题是,我画了一个灰度图像,是形状的矩形边界。我已经在那个矩形上画了形状。现在我需要从图像中删除访问区域 从形状获取矩形边界的代码为: public static Rectangle getBoundingBox(Shape shape,Graphics2D g) { int minX = Integer.MAX_VALUE; int minY = Integer.MAX_VALUE; int maxX = Integer.MIN_VALUE;
public static Rectangle getBoundingBox(Shape shape,Graphics2D g) {
int minX = Integer.MAX_VALUE;
int minY = Integer.MAX_VALUE;
int maxX = Integer.MIN_VALUE;
int maxY = Integer.MIN_VALUE;
final Rectangle polygonBounds = shape.getBounds();
int ax = polygonBounds.x;
int ay = polygonBounds.y;
int bx = ax + polygonBounds.width;
int by = ay + polygonBounds.height;
minX = Math.min(ax, minX);
minY = Math.min(ay, minY);
maxX = Math.max(bx, maxX);
maxY = Math.max(by, maxY);
final Rectangle boundingBox = new Rectangle(minX, minY, 1, 1);
boundingBox.add(maxX, maxY);
return boundingBox;
}
Rectangle rect = getBoundingBox((Shape)selectedArea,g);
int x = (int)rect.getX();
int y = (int)rect.getY();
int width = (int)rect.getWidth();
int height = (int)rect.getHeight();
if((x+width)>grayScaledImage.getWidth()){
width = grayScaledImage.getWidth()-x;
}
if(((y+height)>grayScaledImage.getHeight())){
height = grayScaledImage.getHeight()-y;
}
BufferedImage img = grayScaledImage.getSubimage(x,y,width,height);
}
}
}
g.drawImage(img,x,y,null);
绘制矩形和选定形状的代码为:
public static Rectangle getBoundingBox(Shape shape,Graphics2D g) {
int minX = Integer.MAX_VALUE;
int minY = Integer.MAX_VALUE;
int maxX = Integer.MIN_VALUE;
int maxY = Integer.MIN_VALUE;
final Rectangle polygonBounds = shape.getBounds();
int ax = polygonBounds.x;
int ay = polygonBounds.y;
int bx = ax + polygonBounds.width;
int by = ay + polygonBounds.height;
minX = Math.min(ax, minX);
minY = Math.min(ay, minY);
maxX = Math.max(bx, maxX);
maxY = Math.max(by, maxY);
final Rectangle boundingBox = new Rectangle(minX, minY, 1, 1);
boundingBox.add(maxX, maxY);
return boundingBox;
}
Rectangle rect = getBoundingBox((Shape)selectedArea,g);
int x = (int)rect.getX();
int y = (int)rect.getY();
int width = (int)rect.getWidth();
int height = (int)rect.getHeight();
if((x+width)>grayScaledImage.getWidth()){
width = grayScaledImage.getWidth()-x;
}
if(((y+height)>grayScaledImage.getHeight())){
height = grayScaledImage.getHeight()-y;
}
BufferedImage img = grayScaledImage.getSubimage(x,y,width,height);
}
}
}
g.drawImage(img,x,y,null);
矩形内图像的灰度编码为:
private BufferedImage toGray(BufferedImage image) {
int width = image.getWidth();
int height = image.getHeight();
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
Color c = new Color(image.getRGB(j, i));
int red = (int) (c.getRed() * 0.3);
int green = (int) (c.getGreen() * 0.59);
int blue = (int) (c.getBlue() * 0.11);
int sum = red + green + blue;
Color newColor = new Color(sum, sum, sum);
//Color newColor =Color.red;
image.setRGB(j, i, newColor.getRGB());
}
}
return image;
}
private buffereImage toGray(buffereImage图像){
int width=image.getWidth();
int height=image.getHeight();
对于(int i=0;i
我已经尝试过setClip()方法,但它存在某种抗锯齿问题。所以能得到一些帮助就太好了
图像是:
需要从图像中减去浅灰色部分
所需图像为:
多边形可以是任何形状。这里我建议您尝试以下方法: 您可以创建一个
多边形
对象,并给出xPoints
和yPoint
。像这样的
int[] xPoints;
int[] yPoints;
int length = xPoint.length;
Polygon polygon = new Polygon(xPoints, yPoints, length );
现在添加如下颜色:
Rectangle bounds = polygon.getBounds();
for (int i = 0; i < bounds.width; i++) {
for (int j = 0; j < bounds.height; j++) {
if (polygon.contains(i, j)) {// check if the point is inside the polygon
// do the color stuff here
Color c = new Color(image.getRGB(j, i));
int red = (int) (c.getRed() * 0.3);
int green = (int) (c.getGreen() * 0.59);
int blue = (int) (c.getBlue() * 0.11);
int sum = red + green + blue;
Color newColor = new Color(sum, sum, sum);
//Color newColor =Color.red;
image.setRGB(j, i, newColor.getRGB());
}
}
}
Rectangle bounds=polygon.getBounds();
for(int i=0;i
就是这样(没有任何额外的过程)在这里,我建议您尝试以下方法: 您可以创建一个
多边形
对象,并给出xPoints
和yPoint
。像这样的
int[] xPoints;
int[] yPoints;
int length = xPoint.length;
Polygon polygon = new Polygon(xPoints, yPoints, length );
现在添加如下颜色:
Rectangle bounds = polygon.getBounds();
for (int i = 0; i < bounds.width; i++) {
for (int j = 0; j < bounds.height; j++) {
if (polygon.contains(i, j)) {// check if the point is inside the polygon
// do the color stuff here
Color c = new Color(image.getRGB(j, i));
int red = (int) (c.getRed() * 0.3);
int green = (int) (c.getGreen() * 0.59);
int blue = (int) (c.getBlue() * 0.11);
int sum = red + green + blue;
Color newColor = new Color(sum, sum, sum);
//Color newColor =Color.red;
image.setRGB(j, i, newColor.getRGB());
}
}
}
Rectangle bounds=polygon.getBounds();
for(int i=0;i
(没有任何额外的过程)代码中有一个小错误:索引在循环中被反转。 正确的版本是:
Color c = new Color(image.getRGB(i, j));
int red = (int) (c.getRed() * 0.3);
int green = (int) (c.getGreen() * 0.59);
int blue = (int) (c.getBlue() * 0.11);
int sum = red + green + blue;
Color newColor = new Color(sum, sum, sum);
//Color newColor =Color.red;
image.setRGB(i, j, newColor.getRGB());
代码中有一个小错误:索引在循环中是反向的。 正确的版本是:
Color c = new Color(image.getRGB(i, j));
int red = (int) (c.getRed() * 0.3);
int green = (int) (c.getGreen() * 0.59);
int blue = (int) (c.getBlue() * 0.11);
int sum = red + green + blue;
Color newColor = new Color(sum, sum, sum);
//Color newColor =Color.red;
image.setRGB(i, j, newColor.getRGB());
可以说你想要什么样的结果?最好是在最后制作一幅你想要的图像。@BahramdunAdil我想要的是在任何多边形形状上绘制一幅灰度图像和一种颜色。你的意思是,复制图像中具有多边形形状的部分并将其放入新图像中?但是最好在最后贴一张你想要的图片,这意味着你想要的结果图片是什么样的,编辑问题并发布图像。@BahramdunAdil我已经按照要求编辑了图像。这意味着你想清除灰色内的矩形,只留下多边形区域?你能说你想要什么样的结果吗?最好是在最后制作一幅你想要的图像。@BahramdunAdil我想要的是在任何多边形形状上绘制一幅灰度图像和一种颜色。你的意思是,复制图像中具有多边形形状的部分并将其放入新图像中?但最好在最后发布一幅你想要的图像,这意味着你希望结果图像是什么样的,编辑问题并发布图像。@BahramdunAdil我已经按照要求编辑了图像。这意味着你想清除灰色内的矩形,只留下多边形区域?是否包含()形状的方法不同,因为它不能为形状提供良好的结果。此方法证明不稳定,且具有灰度图像的多边形不在其位置,但如果要检查多边形内是否有任何点,则需要先创建多边形对象,然后再轻松使用。does contains()方法因形状不同而不同,因为它不能为形状提供良好的结果。此方法证明不稳定,并且带有灰度图像的多边形不在其位置,但如果要检查多边形内是否有任何点,则需要首先创建多边形对象,然后使用它将很容易。