Tag Archives: scale

Let the user zoom on a picture and draw in C#

Posted on March 8, 2019 by RodStephens

The example Let the user zoom on a picture in C# allows the user to zoom in on a picture and draw on it. Unfortunately, it doesn’t handle the drawing properly when the image is scaled. It doesn’t scale the … Continue reading →

Posted in drawing, files, graphics, serialization, transformations | 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, transform, transformation, undo, zoom | 1 Comment

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

Important: This example does not handle new drawings correctly if you have scaled the image. Read this one to learn how it works and then see the new post Let the user zoom on a picture and draw in C#. … 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 | 1 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 →