Tag Archives: scale

Use the mouse wheel to scale an image in C#

Posted on August 7, 2017 by RodStephens

This example lets you use the mouse wheel to zoom in and out on an image. To use the mouse wheel, the program needs to catch the MouseWheel event. Unfortunately that event isn’t listed in the Form Designer so you … Continue reading →

Posted in events, graphics, image processing | Tagged C#, C# programming, events, example, example program, graphics, image processing, mouse wheel, scale, Windows Forms programming, zoom | Leave a comment

Drag a map to scroll in C#

Posted on July 29, 2016 by RodStephens

This example shows how you can allow a user to drag a map to scroll to hidden parts of it. Scroll bars provide a simple method for allowing the user to view parts of a map that don’t fit on … Continue reading →

Posted in drawing, graphics, image processing, mathematics | Tagged C#, C# programming, drag a map, drawing, example, example program, graphics, hotspot, image processing, map, mapping, mathematics, scalable map, scale, user interface, Windows Forms programming | 3 Comments

Define map hotspots in C#

Posted on July 27, 2016 by Rod Stephens

The example Display a scalable map with hotspots in C# uses a list of hotspots defined by the following code. // The hotspots. private List Hotspots = new List(); … // Prepare the map for first viewing. private void Form1_Load(object … Continue reading →

Posted in algorithms, graphics, mathematics | Tagged algorithms, C#, C# programming, example, example program, graphics, hotspots, image processing, map, mapping, mathematics, scalable map, scale, Windows Forms programming | Leave a comment

Display a scalable map with hotspots in C#

Posted on July 26, 2016 by Rod Stephens

Making a scalable map with hotspots is surprisingly easy, although getting the details right is a bit tricky. The program displays a map at several different scales. If the map won’t fit on the form at the current scale, it … Continue reading →

Posted in algorithms, graphics, mathematics | Tagged algorithms, C#, C# programming, example, example program, graphics, hotspot, image processing, map, mapping, mathematics, scalable map, scale, Windows Forms programming | 5 Comments

Map drawing coordinates without distortion in C#

Posted on February 11, 2016 by RodStephens

The post Easily map drawing coordinates in C# lets you easily map a rectangle in drawing coordinates to a rectangle in device coordinates. Often, however, you’ll want to ensure that the drawing area isn’t distorted. In other words, you don’t … Continue reading →

Posted in algorithms, drawing, graphics, mathematics | Tagged aspect ratio, C#, C# programming, device coordinates, distortion, drawing, drawing coordinates, example, example program, graphics, map coordinates, Matrix, rotate, rotation, scale, scaling, transform, transformations, translate, translation, Windows Forms programming, world coordinates | 1 Comment

Easily map drawing coordinates in C#

Posted on February 8, 2016 by RodStephens

The example Map points between coordinate systems in C# shows several ways you can map drawing coordinates to screen coordinates. They all work but these sorts of coordinate conversions are really common if you’re doing more advanced graphics so I … Continue reading →

Posted in drawing, graphics, transformations | Tagged C#, C# programming, device coordinates, drawing, drawing coordinates, example, example program, graphics, map coordinates, Matrix, rotate, rotation, scale, scaling, transform, transformations, translate, translation, Windows Forms programming, world coordinates | 1 Comment

Draw round circles in scaled coordinate systems in C#

Posted on December 29, 2015 by Rod Stephens

In other posts I explain how you can use transformations to draw objects in a coordinate system other than the one provided “natively” by a PictureBox, Bitmap, and other objects that support drawing. Basically a transformation (represented by a Matrix … Continue reading →

Posted in drawing, graphics, mathematics | Tagged C#, C# programming, drawing, example, example program, graphics, inverse, invert, lines, mathematics, Matrix, pens, scale, transform, transformation, Windows Forms programming | Leave a comment

Let the user zoom on a picture in C#

Posted on March 31, 2015 by Rod Stephens

The example Provide autosave in C# explains how to make a program that lets the user draw lines in different colors and styles. That program lets the user undo and redo, save and load drawings, and autosaves so it can … Continue reading →

Posted in drawing, files, graphics, serialization | Tagged auto save, autosave, C#, C# programming, colors, dash, deserialization, deserialize, dot, dotted, draw, draw curves, draw polyline, drawing, example, example program, files, graphics, line style, line thickness, load, Polyline, redo, restore, save, scale, scribble, serialization, serialize, toolbar, tools, undo, Windows Forms programming, zoom | Leave a comment

Map points between coordinate systems in C#

Posted on November 27, 2014 by Rod Stephens

This example shows how you can easily map points between different coordinate systems. The Graphics object provides transformations that let you scale, translate, rotate, skew, and otherwise transform graphics as you draw them. One important use of these transformations is … Continue reading →

Posted in algorithms, drawing, graphics, transformations | Tagged algorithms, C#, C# programming, coordinate systems, drawing, example, example program, graphics, map, mapping, Matrix, ResetTransform, scale, ScaleTransform, transform, transformations, translate, TranslateTransform, Windows Forms programming | 2 Comments

Zoom on a graph in WPF and C#

Posted on September 24, 2014 by RodStephens

It’s remarkably easy to zoom on a graph in WPF. This example extends the example Let the user click on graph points in WPF and C#. To modify the previous version, you first need to rebuild the user interface a … Continue reading →