Basics of Graphical User Interfaces in .NET

Implement QR Code in .NET Basics of Graphical User Interfaces
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Basics of Graphical User Interfaces
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Figure 4-5: The new GUI in the old code
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4.4 Selecting Points, Segments, Shapes, or Groups
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In the code introduced in the previous chapter, we have been able to select shapes and move, rotate, or scale them. As a reminder, here is the part of the code that selects shapes:
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void mousePressed(){ xfirst = mouseX; // remember this point yfirst = mouseY; // Pick a shape for(int i=0; i<group.numShapes; i++) if(group.shapes[i].select(( float)x, ( float)y, 10.) == true) control.input.setText( Selected = + i); }
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Since we have written our whole project in a point-segment-shape-group class hierarchy, it should be easy for us now to select any object at any level of that hierarchy. All we need to do is go through the levels and extract the classes that we want. So, for example, if we wanted to select a segment in the preceding code, we need to write:
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// Pick a Segment for(int i=0; i<group.numShapes; i++)
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Basics of Graphical User Interfaces
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for(int j=0; j<group.shapes[i].numSegments; j++) if(group.shapes[i].segs[j].select(( float) mouseX, (float) mouseY, 10.) == true) control.input.setText( You got Segment= + j + of shape= + i);
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As you see, we use the dot operator to point to a subclass of a class. For example, group.shapes[i].segs[j].select will address the select method of the segs object under the shapes object under the group object. So, to select a point we use the following code:
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// Pick a Point for(int i=0; i<group.numShapes; i++) for(int j=0; j<group.shapes[i].numSegments; j++) if(group.shapes[i].segs[j].start.select(( float) mouseX, (float) mouseY, 10.) == true) control.input.setText( You got Point= + j + of shape= + i);
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The same applies to moving or rotating a point or a segment. By arranging the graphical user interface, we can break down all the possible combinations of move/rotate/scale operations for any group/shape/segment/point to allow the user to interact in all possible ways. The GUI for this would be:
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// Choice setup transform = new Choice(); transform.addItem( Move ); transform.addItem( Rotate ); transform.addItem( Scale ); whatPart = new Choice(); whatPart.addItem( Select whatPart.addItem( Select whatPart.addItem( Select whatPart.addItem( Select
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Point ); Segment ); Shape ); Group );
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This will show two choice buttons like those in Figure 4-6.
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Figure 4-6: Two Choice interfaces
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Next, we arrange their functionality to select points or segments or shapes or groups in order to move or rotate or scale. An implementation of this is shown in Figure 4-7.
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Basics of Graphical User Interfaces
Figure 4-7: Selecting groups, shapes, or segments
4.5 Color Setup
In our code so far we have been able to select shapes and move/rotate/scale them. But we always assume that all shapes are blue because that is how we define them in the default data member area of each class. If we want to assign a color, we need to create a method that will set the color to a specified input color. This should be put within each class. The method for this is the following:
void setColor(color inColor){ color = inColor; }
The code is the same for all classes (from MyPoint to MyGroup). Next, we need to draw the object, either with its assigned color or red (to indicate it being selected). So, at the level of MyPoint, we need to create a draw point method that will draw a point:
void draw( ){ if(isSelected) stroke(255,0,0); //red else stroke(0,0,255); //blue rect((int)x, (int)y, 1, 1); }
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Basics of Graphical User Interfaces
We use rect() to draw a rectangle 1 1 pixel wide that represents, on the screen, a point. At the level of a segment, we do the following:
void draw( ){ if(isSelected) stroke(255,0,0); //red else stroke(0,0,255); //blue line((int)start.x, (int)start.y, (int)end.x, (int)end.y); }
At the level of the shape (and the group), we do the following:
void draw(){ for(int i=0; i<numSegments; i++) segs[i].draw(); }
Now all we need is to set the color for the objects and draw them. For example, in the main code if we want to draw all the shapes green, we write:
for(int i=0; i<group.numShapes; i++) group.shapes[i].setColor(0,255,0);
Similarly, if we want to draw the segments with random colors, we write:
for(int i=0; i<group.numShapes; i++) for(int j=0; j<group.shapes[i].numSegments; j++)