CODEWITHSUNDEEP
javaswing
Eradu Grimz
Eradu Grimz

Reputation: 1

Drawing simple bar graph in Java Swing

g.fillRect( 70, 250, 20, 144 );
g.fillRect( 100, 250, 20, 98 );

If I use that to draw a bar graph

I get the following result:

enter image description here

I want the bars to look like:

enter image description here

I know that I can get that result by doing:

g.fillRect( 70, 200-144, 20, 144 );
g.fillRect( 100, 200-98, 20, 98 );

I'm new to Java and I don't really understand whats happening here and how that fixes the problem can someone explain to me why the downside of the bars after the subtraction are aligned?

I know what the four parameters are for. the first 2 are for x, y position and last two are for the width and length.

Upvotes: 0

Views: 1924

Answers (1)

Jared
Jared

Reputation: 1897

Coordinate systems in almost all (native) GUI programming setups start in the upper left corner pixel. Looks like you're assuming it starts in the lower left.

So the pixel 0,0 is the top left pixel, not the bottom left. (1000,1000) is right 1000 pixels and down 1000 pixels from the top left.

Upvotes: 1

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