Figure 3-9: A grid of shapes in .NET

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Figure 3-9: A grid of shapes
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3.7 Selecting Objects
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So far we are able to create shapes by calling the MyShape constructor. We store the shapes in an array of shapes, which form a MyGroup object, and then we draw them on the screen.
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void setup(){ for(int y=0; y<numShapes; y++){ for(int x=0; x<numShapes; x++){ shape[y*numShapes+x] = new MyShape(5,9.,x*20., y*20.); } } group = new MyGroup(numShapes*numShapes, shape); }
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Since these shapes are stored in an array, we should be able to select them. All we need is an x and y mouse point for picking and the array of shapes. What we do is simple: first we find which are the closest points to the x, y mouse point and then find to which shape do these points belong. Then, we could color the shape with a color, that is, red, to visualize it as picked.
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The Structure of Shapes
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To accomplish this, you need to create two more data members on each of the four classes we created (MyPoint, MySegment, MyShape, and MyGroup). You also need a boolean, to declare it picked, and a color to paint it. These are
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boolean isSelected = false;
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We also need to create a method called select (or pick). So in the case of the class MyPoint, we add the two new members, color and isSelected:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 class MyPoint { // members of class float x, y; boolean isSelected = false;
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// the coordinates // is this point selected
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// Constructor MyPoint(float xin, float yin){ x = xin; y = yin; }
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// Move void move(float xoff, float yoff){ x = x + xoff; y = y + yoff; }
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// Select boolean select(float xpick, float ypick, float tolerance){ if(abs(x - xpick) < tolerance && abs(y - ypick) < tolerance ) { isSelected = true; return true; } else { isSelected = false; } return false; } }
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The Structure of Shapes
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The select() method gets two coordinates xpick and ypick, coming from the myMousePressed, and a tolerance of how far can a point be, in order to be selected. So, do the following: first, get the absolute distance of the xpick and ypick from the local x and y coordinates of the point and then check to see whether they are less than the tolerance value. If they are, then set the boolean isSelected to true; otherwise, set it to false. Next, the select() method returns whether the point was selected or not. On the MySegment level, we do almost the same thing:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 class MySegment { // members of class MyPoint start = new MyPoint(0., 0.); MyPoint end = new MyPoint(0., 0.); color blue = color(0,0,255); color red = color(255,0,0); boolean isSelected = false; // is
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// start point // end point // default color // selected color this segment selected
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// Constructor MySegment(MyPoint p1, MyPoint p2){ start.x start.y end.x end.y } // Move void move(float xoff, float yoff){ start.move(xoff, yoff); end.move(xoff, yoff); } // draw void plot(){ if(isSelected) stroke(red); else stroke(blue); line((int)start.x, (int)start.y, (int)end.x, (int)end.y); } // Select boolean select(float xpick, float ypick, float tolerance){ = = = = p1.x; p1.y; p2.x; p2.y;
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The Structure of Shapes
if(start.select(xpick, ypick, tolerance)==true || end.select(xpick, ypick, tolerance)==true) { isSelected = true; return true; } else { isSelected = false; } return false; }
At this level, the select() method gets the two coordinates, xpick and ypick (coming from the myMousePressed), and a tolerance distance value. It then transfers the process to the select() method of the two points start and end. If either one is yes, then set the boolean isSelected to true; otherwise, set it to false. Then return whether the segment was selected or not. In addition, here, in the plot(..) method, you set the color to red if isSelected is true; otherwise, leave it with the default color. At the level of the shape, you do almost the same thing as for the segment:
1 2 3 4 5 6 7 8 9 10 11 . . . 12 13 14 15 16 17 18 . . . 19 20 21 22 23 24 class MyShape { // members of class MySegment[] segs; int numSegments; boolean isSelected = false;