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Dynamic Centering and Alignment on the Canvas

In this JavaScript programming exercise you can learn the logic behind dynamic centering and alignment for dynamically positioning your canvas assets. <!DOCTYPE html> <html> <head> <style> body{ margin:10px; background:#666; } #my_canvas{ background:#FFF; border:#000 1px solid; } </style> <script> function draw(){ var ctx = document.getElementById('my_canvas').getContext('2d'); ctx.fillStyle = "magenta"; var rectW = 100; var rectH = 100; var rectX = (ctx.canvas.width * .5) - (rectW * .5); var rectY = (ctx.canvas.height * .5) - (rectH * .5); ctx.fillRect(rectX, rectY, rectW, rectH); } window.onload = draw; </script> </head> <body> <canvas id="my_canvas" width="500" height="350"></canvas> </body> </html>
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JavaScript Videos

Canvas Programming

2D Context Object and Rectangle MethodsFill and Stroke Styles Color Gradient PatternLine Styles for Lines and StrokesBuilding and Drawing PathsDrawing Images and VideosDrawing Text on CanvasRendering Shadows on CanvasCanvas Transformation EffectsPixel Manipulation on CanvasCompositing on the CanvasDynamic Centering and Alignment on the CanvasCanvas Animation and App InitializationObject Oriented Assets OOP on CanvasDetect Mouse Coordinates on CanvasAnimated Background Layers on Canvas TutorialKeyboard Control and MovementJSON Object Arrays and Loops on CanvasHit Detection Mouse Touch Over Object ArraysCollision Detection Hit Game EnemiesParticle Effect System Tutorial Snow Falling AnimationInteractive Canvas Imaging Applications JavaScript PHP TutorialCircular Progress Loader Canvas JavaScript Programming Tutorial