GRAPHICS CANVAS COORDINATES

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The Graphics Canvas coordinates are the combination of two-dimensional rectangular grid coordinates.

Canvas Coordinates

• Coordinates belong to mathematical geometry class.
• The UPPER-LEFT corner of the canvas has the coordinates (0,0).
• The first value of coordinate (0 - x Coordinate) As Canvas Width.
• The second value of coordinate (0 - y Coordinate) As Canvas Height.

Example of Canvas Coordinates

<script> window.onload = function () { var canvas = document.getElementById("myCanvas"), c = canvas.getContext("2d"); c.fillStyle = "black"; c.fillRect(0, 0, canvas.width, canvas.height); c.fillStyle = "red"; c.fillRect(20, 20, 50, 50); c.strokeStyle = "white"; c.lineWidth = 10; c.strokeRect(20, 20, 50, 50); c.strokeStyle = "#7e9fc2"; c.lineWidth(20, 20, 50, 50); </script> <canvas id="myCanvas" width="500" height="200"></canvas

Result Look Like

Methods used to Draw Canvas Coordinates

Functions used to Draw the Line

• beginPath();
• moveTo(x, y); - It define the position.
• lineTo(x, y); - It define the coordinates
• fill(); - Example (fillRect(x, y, width, height, opecity)).
• stroke(); - Its make a line visible.
• closePath(); - Its close the othere unvisible line.
• fillStyle = "rgba(0,0,0, opicity)"
• lineCop = "round"; - It use to give shap of line.

Functions used to Draw the Circle

These are circle methods, we are using for draw circle:

• arc(x, y, radius, start-Angle, end-Angle (2*Math.IP), false);
• arc styled methods - lineWidth(); strokeStyle(); lineCap();

ARC methods define

arc(); Method of the Canvas 2D API adds an arc to the path which is centered at (x, y) position with radius r starting at star-Angle and ending at end-Angle.

• x, y coordinates of the arc's center point
• A radius (r)
• A star-tAngle, and end-Angle - measured clockwise from the positive x-axis
• An optional boolean - if true, the arc to be drawn counter-clockwise between the two angles.

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