java - Graphics and negative ordinate -


i want display points can have negative coordinates (x , y). now, points have negative x seem correctly displayed (ie. : @ left of points have positive x).

however, points have negative y displayed @ top of graph : exemple, point y = -5 displayed in top of point y = -3...

how can reverse graphics' displaying ?

my (simple) code :

package general_classes;  import javax.swing.*; import java.awt.*; import java.util.list;  public class graph extends jframe {      private list<storabledata> list_detected_points;     private list<storabledata> list_all_points;     private cupple barycenter;      public graph(string title, list<storabledata> list_all_points, list<storabledata> list_detected_points) {          double scaling_coef = 200;         double move_x = 500, move_y = 500;           this.add(new jpanel() {             private graphics graphics;              int x, y;             private void drawpoint(cupple storable_data) {                 x = (int) (storable_data.getnumber(0) * scaling_coef + move_x);                 y = (int) (storable_data.getnumber(1) * scaling_coef + move_y);                 graphics.fillrect(x, y, 10, 10);                 graphics.drawstring(storable_data.tostring(), x - 5, y - 5);             }              @override             public void paint(graphics graphics) {                 this.graphics = graphics;                  for(storabledata storable_data : list_all_points) {                     graphics.setcolor(color.white);                     this.drawpoint((cupple) storable_data);                 }                  if(list_detected_points != null) {                     (storabledata storable_data : list_detected_points) {                         graphics.setcolor(color.red);                         this.drawpoint((cupple) storable_data);                      }                 }              }         });          this.setvisible(true);     }  }

assuming receive points need draw, first find minimum , maximum coordinates on each dimension. this, can obtain scaling factor (using distance between min , max, , size of drawing box have) , offset (so min correspond 0 of draw box).

then create affinetransform data above correctly convert each point when drawing it.


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