Creativity and logical solutions to a wide range of projects have shaped Chantal into the professional engineer she is today. She brings over 10 years of extensive experience in designing sustainable stormwater solutions and Best Management Practices. Her ability to bring synergism between landscape architecture and civil engineering is going to add a new dynamic to our process, which will only make us stronger designers, collaborators, and design partners.
Being part of the creative process challenges me to consider solutions that will not only provide function but enriching experience. Colleen is an experienced urban planner who thrives in collaborative environments, working with multi-disciplinary teams and with diverse stakeholders to complete sustainable, equitable, and inclusive projects.
Having been a city Zoning Administrator and private sector Transportation Planner, she understands the many perspectives involved in project development. Her background makes her uniquely qualified to find common ground and creative solutions. She is also an entrepreneur in the St. Louis area. Clients come to SWT for an engaging, delightful process and a talked-about finished design. A set of values that we practice every day. CHoPS for short. Good ideas can come from anywhere. We listen closely and remain open before forming our opinions.
We seek common understanding and encourage wide-ranging input through constant inquiry. Clear is kind, and transparent communication holds us together. We tell the truth as a sign of respect. We navigate every conversation with professional candor and compassion. Creativity is a current that never stops flowing. We choose to tap into it every day.
For every project, we add a new detail or a different method. We find great joy in the act of creation, and we seek to pass that joy to the end-user. The long view looks bright. We practice dedication and commitment. We are loyal and respectful of our profession.
Because GC objects employ native OS resources, you need to dispose of them if you created them. See Chapter 2 for details on resource management. Typically, you obtain an existing graphics context instance from a PaintEvent object.
We used the following code to display the percentage value in a progress bar in Chapter When the progress bar is being painted, the paint listener is invoked with a PaintEvent object as the argument.
A graphics context instance for the progress bar is stored in the gc field of the PaintEvent object. We then use the graphics context instance to perform actual drawing operations on the progress bar. After finishing drawing, we do not dispose of the graphics context object because it was not created by us.
After finishing drawing with an existing graphics context instance, you should not dispose of it if you did not create it. If you are unable to get an existing graphics context of a drawable object, you can create one. For example, the following code draws an oval on the image on the right side of Figure Figure An image the Eclipse logo is created from a GIF file. The other image is obtained by cloning the first image. In order to draw on the second image, we then create a GC object from it.
Then we draw a white oval on the graphics context. Because this GC object is created by us, we need to dispose of it after finishing drawing. Finally, two labels are used to display both of the images. In Figure , you can clearly see there is a white oval on the second image. In previous sections, you have seen examples of drawing on controls.
SWT provides a class org. Canvas designed for general graph drawing. Canvas , as the name suggests, provides a surface for you to perform arbitrary drawing operations. As an example, the following code creates a canvas with a rounded rectangle on it see Figure While creating a canvas, you may optionally specify one or more of its painting configuration styles:. Before using the preceding styles, you should fully understand them. Otherwise, they may introduce many undesired effects to your canvases.
For more details, please refer to the Javadoc documentation. In SWT, graphics objects live in a plane defined by Cartesian coordinates, where the origin is at the topleft corner 0, 0 , the x axis increases from left to right, and the y axis increases from top to bottom. You simply pass the coordinating x and y values of the two end points of the line to the method. If you need to draw multiple connected straight lines, you can use the drawPolyLine method:. A polyline is a series of connected lines.
A polyline can be represented by an array containing the coordinating x and y values of connecting points. Lines are drawn between each consecutive pair and no line is drawn between the first pair and the last pair in the array.
For example, the following code draws a right angle, as shown in Figure The drawPolygon method works similarly to drawPolyline except that the line between the last point and the end point is drawn. If you replace the gc. You specify the coordinating x and y values of the top-left corner point and the width and height of the rectangle as the arguments to the drawRectangle method.
Alternatively, you can put the four parameters into a Rectangle object and call the following method:. The resulting drawing is a circle or an ellipse fitting within the rectangle area specified by the arguments. If you want to draw only a part of an oval i. The first four parameters specify the oval that the arc belongs to.
The last two parameters define which part of the oval the arc occupies. The arc begins at startAngle and expands for arcAngle degrees. Angle 0 degree is at the three o'clock position and degree values increase counterclockwise. The GC class also provides the drawRoundRectangle method for you to draw round-cornered rectangles:. The first four parameters define the bound of the rectangle and the last two parameters specify the width and height of the corner arcs.
So far, you have learned about several methods for drawing lines, arcs, and shapes. Before calling the preceding method, you can set the foreground color. Additionally, you can use the following methods to set the line style and line width:. In previous sections, you have learned how to draw lines, arcs, and shapes with the drawing method of the GC class. There are corresponding filling methods in the GC class that you can use to fill various shapes:. Instead of drawing the outlines of the shapes, the preceding filling methods fill the shapes with the background color of the graphics context.
Note that the bottom and right edges of the shapes are not included in filling operations. For example, fillRectangle 0, 0, , fills the area within the rectangle [0, 0, , 99]. From a programming standpoint, filling shapes is very similar to drawing shapes. For example, by changing gc. Because the default background color of the graphics context is the same as the background color of the control, the background color of the graphics context is changed before the fillArc method is called otherwise, you won't be able to see the filled area.
Joe Winchester Messages: Registered: July Double buffering for a drawing operating can be done something like control. I believe that some platforms already will double buffer for you "for free", so in effect this kind of code might end doing a triple buffer. Best regards, Joe Report message to a moderator. Tue, 15 July Someone pointed out a programming error.
Thu, 17 July But it flicks frequently like the old style movie when I get it painted very fast. I'm wondering it is really double buffering or not? This tutorial continues on Eclipse RCP online training or Eclipse IDE extensions with lots of video material, additional exercises and much more content.
If you need more assistance we offer Online Training and Onsite training as well as consulting. Eclipse WindowBuilder. This tutorial describes the usage of WindowBuilder for creating user interfaces.
What is SWT Designer? Building an user interface The following exercise assumes that you have SWT Designer already installed.
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