AffineTransform

那么我使用这段代码来绘制我的图形边缘，如果用户想在流动模式下看到图形，那么我画箭头代替线条，所有工作都很完美，直到我改变窗口大小，然后箭头开始点（x1，y1）与我的节点不同步地移动而使它们不连通，而drawLine（）则完美无缺。AffineTransform

这事做的的AffineTransform？

（绘画方法的箭头从here通过））

void drawArrow(Graphics g1, int x1, int y1, int x2, int y2) { 
    Graphics2D g = (Graphics2D) g1.create(); 
    int arrowSize = 5; 
    double dx = x2 - x1, dy = y2 - y1; 
    double angle = Math.atan2(dy, dx); 
    int len = (int) Math.sqrt(dx*dx + dy*dy); 
    AffineTransform at = AffineTransform.getTranslateInstance(x1, y1); 
    at.concatenate(AffineTransform.getRotateInstance(angle)); 
    g.setTransform(at); 
    g.drawLine(0, 0, len, 0); 
    g.setStroke(new BasicStroke(1)); 
    g.drawLine(len/3, arrowSize , len/3-3*arrowSize, 0); 
    g.drawLine(len/3, -arrowSize , len/3-3*arrowSize, 0); 
}

给谁逛到油漆边缘方法看起来怎么样：

public void paintEdge(Graphics g) { 
    Point uCenter = u.getCenter(); 
    Point vCenter = v.getCenter(); 
    g.setColor(color); 
    Graphics2D g2=(Graphics2D) g; 
    g2.setStroke(new BasicStroke(3)); 
    if (mode==Mode.FLOW) { 
     int minx=Math.min(uCenter.x, vCenter.x),miny=Math.min(uCenter.y, vCenter.y); 
     int maxx=Math.max(uCenter.x, vCenter.x),maxy=Math.max(uCenter.y, vCenter.y); 
     g2.drawString(""+ f + "/" + c,10+minx + (maxx-minx)/2,10+miny+ (maxy- miny)/2); 
     drawArrow(g2,uCenter.x, uCenter.y, vCenter.x, vCenter.y); 
    } else { 
     g2.drawLine(uCenter.x, uCenter.y, vCenter.x, vCenter.y); 
    } 
    g2.setStroke(new BasicStroke(1)); 
}

来源

2012-02-02 Ofek Ron

为了更好地帮助越早，张贴[SSCCE（http://sscce.org/）。 – 2012-02-02 22:54:29

真正的问题在开头提到，代码只是一个插图 – 2012-02-02 22:56:27

in drawArrow你有Graphics2D g =（Graphics2D）g1.create（）;但我不明白为什么你不会只投它就像你在paintEdge – ghostbust555 2012-02-02 23:02:22

void drawArrow(Graphics2D g, int x1, int y1, int x2, int y2) { 
    AffineTransform prev = g.getTransform(); 
    int arrowSize = 5; 
    double dx = x2 - x1, dy = y2 - y1; 
    double angle = Math.atan2(dy, dx); 
    int len = (int) Math.sqrt(dx*dx + dy*dy); 
    AffineTransform at = AffineTransform.getTranslateInstance(x1, y1); 
    at.rotate(angle); 
    g.transform(at); 
    g.drawLine(0, 0, len, 0); 
    g.setStroke(new BasicStroke(1)); 
    g.drawLine(len/3, arrowSize , len/3-3*arrowSize, 0); 
    g.drawLine(len/3, -arrowSize , len/3-3*arrowSize, 0); 
    g.setTransform(prev); 
}

这是如何做，要谁想知道。

问题是，我用g.setTransform（AT）;而不是g.transform（at）; 这是一个很难的。

来源

2012-02-03 22:48:53

AffineTransform

回答

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