GDI+ is the graphical library used in the .NET Framework.<\/p>\n
http:\/\/www.functionx.com\/vccli\/index.htm<\/p>\n
Include the namespace:<\/p>\n
\tSystem::Drawing<\/code><\/pre>\nAdd the following to the forms constructor<\/h5>\n\r\n\tbmpDrawingArea = gcnew Bitmap(Width, Height);\r\n\tgraphDrawingArea = Graphics::FromImage(bmpDrawingArea);\r\n<\/code><\/pre>\nThen<\/h5>\n
Create the forms paint event (select form > select the properties lighting bolt icon > double click event) and add:<\/p>\n
\r\n\te->Graphics->DrawImage(bmpDrawingArea, 0, 0);\r\n<\/code><\/pre>\nSelect the form and set is DoubleBuffered property to true, to avoid blinking when its updated<\/p>\n
Then in the function that you want to draw all the graphics bits in use this at the beginning:<\/p>\n
\tgraphDrawingArea->Clear(this->BackColor);<\/code><\/pre>\nThen do all your drawing bits and bobs
\nThen use this to cause the form to be updated<\/p>\n
\tInvalidate();\t\t\/\/Trigger the paint event<\/code><\/pre>\nGetting a Graphic Object<\/h4>\n
Every Windows control automatically inherits a method called CreateGraphics(), which gives you access to the graphic part of a control. The CreateGraphics() method returns the Graphics object of the variable you call it from. An example of getting the Graphics object of a form:<\/p>\n
\r\nSystem::Void button1_Click(System::Object ^ sender,\r\n\t\t\t System::EventArgs ^ e)\r\n{\r\n Graphics ^ graph = this->CreateGraphics();\r\n<\/code><\/pre>\nAnother technique is to call the Graphics::FromHwnd() static method. Its syntax is:<\/p>\n
\r\nSystem::Void button1_Click(System::Object ^ sender,\r\n\t\t\t System::EventArgs ^ e)\r\n{\r\n Graphics ^ graph = Graphics::FromHwnd(this->Handle);\r\n<\/code><\/pre>\nStopping blinking of the form<\/h4>\n
Select the form and set its DoubleBuffered property to true.<\/p>\n
Pen Colour<\/h4>\n
Specifying by name<\/p>\n
\tBackColor = Color::Turquoise;<\/code><\/pre>\nSpecifying from RGB values<\/p>\n
\tBackColor = Color::FromArgb(26, 69, 174);<\/code><\/pre>\nCreating a variable to hold colour<\/p>\n
\tColor clrBlue = Color::Blue;<\/code><\/pre>\nSolid Brush Colour<\/h4>\n\r\nSolidBrush^ lightColour = gcnew SolidBrush(Color::Lime);\r\nlightColour->Color = Color::FromArgb(5, 10, 20);\r\n<\/code><\/pre>\nPen<\/h4>\n
The most basic graphic tool<\/p>\n
Pen ^ penRed = gcnew Pen(Color::Blue);<\/code><\/pre>\nDefining a pen to use to change colour<\/h5>\n\r\n\tPen ^ penColour = gcnew Pen(Color::Blue);\r\n\tpenColour->Color = Color::Red;\r\n<\/code><\/pre>\nDrawing Rectangles<\/h4>\nDeclare two variables as follows<\/h5>\n\r\nprivate:\r\n\t\t\/\/\/ <summary>\r\n\t\t\/\/\/ Required designer variable.\r\n\t\t\/\/\/ <\/summary>\r\n\t\tGraphics^ graphDrawingArea;\r\n\t\tBitmap^ bmpDrawingArea;\r\n<\/code><\/pre>\nIn the form load event<\/h5>\n\r\n\tbmpDrawingArea = gcnew Bitmap(Width, Height);\r\n\tgraphDrawingArea = Graphics::FromImage(bmpDrawingArea);\r\n<\/code><\/pre>\nCreate the paint event for the form and put this in it<\/h5>\n\r\n\te->Graphics->DrawImage(bmpDrawingArea, 0, 0);\r\n<\/code><\/pre>\nThen to draw rectangles use the following<\/h5>\n\r\n \tgraphDrawingArea->Clear(this->BackColor);\r\n\r\n\tgraphDrawingArea->DrawRectangle(gcnew Pen(Color::Red), 20, 20, 40, 60);\t\/\/colour, x, y, width, height - x,y is top left corner\r\n\r\n\tInvalidate();\t\t\/\/Trigger the paint event\r\n\r\n\t\/\/or use\r\n\tgraphDrawingArea->FillRectangle(gcnew SolidBrush(Color::Lime), 20, 20, 40, 60);\t\/\/colour, x, y, width, height - x,y is top left corner\r\n<\/code><\/pre>\nDrawing Elipses \/ Circles<\/h4>\n
Note that the X and Y coords define the top left corner of a rectangle that encloses the elipse.<\/p>\n
\r\n\tgraphDrawingArea->DrawEllipse(gcnew Pen(Color::Red), Rectangle(\r\n\t\t\t\t\ttargets_start_x + (targets_width >> 1) + x_coord,\r\n\t\t\t\t\ttargets_start_y + y_coord,\r\n\t\t\t\t\ttarget_diameter,\r\n\t\t\t\t\ttarget_diameter\r\n\t\t\t\t\t));\t\/\/colour, x, y, width, height - x,y is top left corner\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"GDI+ is the graphical library used in the .NET Framework. Good Resources http:\/\/www.functionx.com\/vccli\/index.htm How To Draw Graphics On A Form Include the namespace: System::Drawing Add the following to the forms constructor bmpDrawingArea = gcnew Bitmap(Width, Height); graphDrawingArea = Graphics::FromImage(bmpDrawingArea); Then Create the forms paint event (select form > select the properties lighting bolt icon > […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67],"tags":[],"class_list":["post-527","post","type-post","status-publish","format-standard","hentry","category-graphics"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/comments?post=527"}],"version-history":[{"count":2,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/527\/revisions"}],"predecessor-version":[{"id":1060,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/527\/revisions\/1060"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/media?parent=527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/categories?post=527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/tags?post=527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}