The Structure of Shapes in .NET

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The Structure of Shapes
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the older constructor had only two parameters; this one has four. In this new constructor, the first thing we need to do is to assign the number of sides and to allocate memory for the segs[ ] array:
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numSegments = numSides; segs = new MySegment[numSegments];
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Then, we divide the full circle into sections:
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float angle = 2 * Math.PI / numSegments;
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Then we create two points, p and pnext, where we will put the two points necessary to create each segment. We initialize them to 0. Then we loop and compute the points around the circle and for each one we compute the one ahead; we need them in order to create the segments.
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for(int i =0; i<numSegments; i++){ p.x = xoff + radius * sin(angle*i); p.y = yoff + radius * cos(angle*i); pnext.x = xoff + radius * sin(angle*(i+1)); pnext.y = yoff + radius * cos(angle*(i+1)); segs[i] = new MySegment(p, pnext); }
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Once we compute the two points, p and pnext, we pass them to the MySegment, which constructs a segment, which is then assigned to the array segs[], one at a time:
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segs[i] = new MySegment(p, pnext);
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All we need to do now is to call the creation of a 20 20 grid of pentagons in the main code:
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 MyShape[] shape = new MyShape[12*12];
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void setup(){ size(350,350); //make the screen big enough to see for(int y=0; y<12; y++){ //for 12 steps in y for(int x=0; x<12; x++){ //for 12 steps in x //make a shape (calling the polygon constructor) shape[y*12+x] = new MyShape(5, 10.,x*20., y*20.); shape[y*12+x].move(10.*x, 10.*y); } } }
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17 18 19 20 21 22 23 24 25 void draw(){
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The Structure of Shapes
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for(int y=0; y<12; y++){ //for 12 steps in y for(int x=0; x<12; x++){ //for 12 steps in x shape[y*12+x].plot(); // plot the shapes } } }
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Take a note that the expression y*12+x is a way of counting from 0 to 144 (i.e., 12*12), using the two counters x and y. The result is shown in Figure 3-8.
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Figure 3-8: A grid of shapes
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Once we have an array of shapes, we can then create a group-type class, which we will call MyGroup. Then we would only need to call group.move() and group.draw() to move and draw all the shapes together. This will be done in the next section.
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3.6 Class MyGroup
MyGroup is a class that acts as a representative for a set of shapes. Its structure is similar to that of MyShape, except that it is one level higher:
1 2 3 4 5 6 class MyGroup { // members of class MyShape[] shapes; int numShapes;
// array of shapes //number of shapes
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The Structure of Shapes
// Constructor MyGroup(int numInputShapes, MyShape[] inputShapes){ numShapes = numInputShapes; shapes = new MyShape[numShapes]; for(int i=0; i<numShapes; i++) shapes[i] = inputShapes[i]; } // Move void move(float xoff, float yoff){ for(int i=0; i<numShapes; i++) shapes[i].move(xoff, yoff); } // draw void plot( ){ for(int i=0; i<numShapes; i++) shapes[i].plot(); } }
Now, we do not need to create multiple shapes in the main code but, instead, call the creation of a group:
int numShapes = 12; //num on side of grid of shapes MyShape[] shape = new MyShape[numShapes*numShapes]; MyGroup group; //***************************************** void setup(){ size(250,250); 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); group.move(10.,10.); }
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void draw( ){ group.plot(); }
The Structure of Shapes
The result, shown in Figure 3-9, is the same, except that now we are in control of the whole group as one entity instead of 12 12 sub-entities: