Triangle Draw Method

Question

I have trouble drawing a triangle with the draw Graphics g  method in Java  I can draw a rectangle like so   public void draw Graphics g        g setColor colorFill       g fillRect p x  p y  width  height       g setColor colorBorder       g drawRect p x  p y  width  height       drawHandles g     Where p represents  the top left corner of the shapes   How would I draw the triangle in the same manner   Could someone give me an example for a standard triangle

User · Answer

You can use Processing library  https   processing org reference PGraphics html There is a method called triangle    g triangle x1 y1 x2 y2 x3 y3

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There is not a drawTriangle method neither in Graphics nor Graphics2D  You need to do it by yourself  You can draw three lines using the drawLine method or use one these methods    drawPolygon int   xPoints  int   yPoints  int nPoints  drawPolygon Polygon p  drawPolyline int   xPoints  int   yPoints  int nPoints    These methods work with polygons  You may change the prefix draw to fill when you want to fill the polygon defined by the point set  I inserted the documentation links  Take a look to learn how to use them   There is the GeneralPath class too  It can be used with Graphics2D  which is capable to draw Shapes  Take a look    http   docs oracle com javase tutorial 2d geometry arbitrary html

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Use a line algorithm to connect point A with point C  and in an outer loop  let point A wander towards point B with the same line algorithm and with the wandering coordinates  repeat drawing that line  You can probably also include a z delta with which is also incremented iteratively  For the line algorithm  just calculate two or three slopes for the delta change of each coordinate and set one slope to 1 after changing the two others proportionally so they are below 1  This is very important for drawing closed geometrical areas between connected mesh particles  Take a look at the Qt Elastic Nodes example and now imagine drawing triangles between the nodes after stretching this over a skeleton  As long as it will remain online

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There is no direct method to draw a triangle  You can use drawPolygon   method for this  It takes three parameters in the following form  drawPolygon int x   int y    int number of points   To draw a triangle   Specify the x coordinates in array x and y coordinates in array y and number of points which will be equal to the elements of both the arrays Like in triangle you will have 3 x coordinates and 3 y coordinates which means you have 3 points in total   Suppose you want to draw the triangle using the following points  100 50   70 100   130 100  Do the following inside public void paint Graphics g    int x    100 70 130   int y    50 100 100   g drawPolygon x y 3     Similarly you can draw any shape using as many points as you want

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there is no command directly to draw Triangle  For Drawing of triangle we have to use the concept of lines here   i e  g drawLines Coordinates of points

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You should try using the Shapes API   Take a look at JPanel repaint from another class which is all about drawing triangles  look to the getPath method for some ideas  You should also read up on GeneralPath  amp  Drawing Arbitrary Shapes   This method is much easy to apply AffineTransformations to

[java] Triangle Draw Method

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