Effects | React-Native Programmierer . Patrick Tresp

HTML Canvas – draw within context and getImageData // patchwork effect

26-06-2012

For the company website we are trying to entertain our visitors w/ some technical stuff, since we do not have any real content.

We are pragmatic, so we use standard wordpress and standard theme for our website. The header image looks like this:

For this, i really like the Photoshop Filter Patchwork, which does basically this:

Pretty neat, but hey, we are developers and here, we do not want to use standard Photoshop-Filters.

Also i really like the pixel idea but we have the diamond as element.

So next Step is somthing like this:

Looks litte like a sawblade, so the first row and column need to be treated extrawise.

Great. Adding the extra diamond Symbol, and we are done:

update:

to soften it up a bit, added

 context.shadowOffsetX = -2;
    context.shadowOffsetY = -2;
    context.shadowBlur = 8;
    context.shadowColor = "rgb(91,91,91)";

For those, who want to try out by themselves, here is the code:

HTML:

<html>
<head>
<title>Canvas Drawing Image</title>
<style>
 
    #imageCanvas {
        width: 1000px;
        height: 288px;
    }
 
    #sourceCanvas {
        display: none;
        width: 1000px;
        height: 288px;
    }
</style>
 
</head>
<body onload="draw();">
<h1>Diamonds</h1>
 
<div id="myDiv">
    <div>lets see!<br/><br/></div>
</div>
 
<canvas id="imageCanvas" width="1000" height="288"><img src="shore.jpg" width="1000" height="288" alt="alternative image for non-canvas browsers" /></canvas>
<canvas id="sourceCanvas" width="1000" height="288">This is the source image, should be hidden</canvas>
<div id="console"></div>
 
</body>
</html>

JavaScript

<script>
/*
 * Created by Bayer und Preuss
 * User: patricktresp
 * Date: 26.06.12
 */
var _diamondWidth = 10;
var _diamondHeight = 15;
var float_ts = 0;
 
function draw() {
 
    float_ts = new Date().getTime();
 
    var sourceCanvas = document.getElementById("sourceCanvas");
 
    if (sourceCanvas.getContext) {
 
        var image = new Image();
        image.src = "shore.jpg";
        // caution : image.onload is lowercase not onLoad!
        image.onload = function() {
 
            var context = sourceCanvas.getContext('2d');
            context.drawImage(image, 0, 0);
 
            drawDiamonds();
        }
    }
}
 
function drawDiamonds() {
 
    var canvas = document.getElementById('imageCanvas');
 
    // make sure context is available
    if (canvas.getContext) {
 
        var context = canvas.getContext('2d');
        var columns = canvas.width / _diamondWidth;
        var rows = canvas.height / _diamondHeight;
 
        for (var j = 0; j <= rows; j++) {
 
            for (var i = 0; i <= columns; i++) {
 
                // draw topTriangles  when in row 0
                if (j == 0) drawTopTriangle(canvas, i, j);
 
                // draw sideTriangles when in column 0
                if (i == 0) drawSideTriangle(canvas, i, j);
 
                // firstRow
                drawDiamond(canvas, i, j);
                // secondRow displaced
                drawDiamond(canvas, i + 0.5, j + 0.5);
 
            }
        }
 
        // add extra brand stuff
        drawBayerUndPreussDiamonds(canvas);
    }
}
 
 
function drawDiamond(canvas, i, j) {
    var context = canvas.getContext('2d');
 
    var topX = _diamondWidth / 2 + i * _diamondWidth;
    var rightX = _diamondWidth + i * _diamondWidth;
    var bottomX = topX;
    var leftX = i * _diamondWidth;
 
    var topY = 0 + j * _diamondHeight;
    var rightY = topY + _diamondHeight / 2;
    var bottomY = topY + _diamondHeight;
    var leftY = rightY;
 
    var color = getBitmapColorForRect(canvas, i * _diamondWidth, j * _diamondHeight, _diamondWidth, _diamondHeight);
 
    context.fillStyle = color;
 
    context.shadowOffsetX = -2;
    context.shadowOffsetY = -2;
    context.shadowBlur = 8;
    context.shadowColor = "rgb(91,91,91)";
 
    context.beginPath();
    context.moveTo(topX, topY);
    context.lineTo(rightX, rightY);
    context.lineTo(bottomX, bottomY);
    context.lineTo(leftX, leftY);
    context.lineTo(topX, topY);
    context.fill();
 
}
 
function drawTopTriangle(canvas, i, j) {
 
    var canvas = document.getElementById('imageCanvas');
    var context = canvas.getContext('2d');
 
    var leftX = i * _diamondWidth + _diamondWidth / 2;
    var rightX = leftX + _diamondWidth;
    var bottomX = leftX + _diamondWidth / 2;
 
    var leftY = j;
    var rightY = leftY;
    var bottomY = j + _diamondHeight / 2;
 
    var color = getBitmapColorForRect(canvas, i * _diamondWidth, (j + 1) * _diamondHeight, _diamondWidth / 2, _diamondHeight / 2);
 
    context.fillStyle = color;
    context.beginPath();
    context.moveTo(leftX, leftY);
    context.lineTo(rightX, rightY);
    context.lineTo(bottomX, bottomY);
    context.lineTo(leftX, leftY);
    context.fill();
 
}
 
function drawSideTriangle(canvas, i, j) {
 
    var context = canvas.getContext('2d');
 
    var leftX = i;
    var rightX = leftX + _diamondWidth / 2;
    var bottomX = leftX;
 
    var leftY = j * _diamondHeight - _diamondHeight / 2;
    var rightY = leftY + _diamondHeight / 2;
    var bottomY = leftY + _diamondHeight;
 
    var color = getBitmapColorForRect(canvas, i * _diamondWidth, j * _diamondHeight, _diamondWidth / 2, _diamondHeight / 2);
 
    context.fillStyle = color;
    context.beginPath();
    context.moveTo(leftX, leftY);
    context.lineTo(rightX, rightY);
    context.lineTo(bottomX, bottomY);
    context.lineTo(leftX, leftY);
    context.fill();
}
 
function getBitmapColorForRect(canvas, x, y, width, height) {
 
    var sourceCanvas = document.getElementById("sourceCanvas");
 
    if (sourceCanvas.getContext) {
        var context = sourceCanvas.getContext('2d');
 
        if (context) {
 
            var imageData = context.getImageData(x, y, width, height);
 
            return 'rgb(' + imageData.data[0] + ', ' + imageData.data[1] + ', ' + imageData.data[2] + ')';
        }
    }
 
    return 0;
}
 
function drawBayerUndPreussDiamonds(canvas) {
    var color = 'rgb(255,243,123)';
 
    var w = _diamondWidth;
    var h = _diamondHeight;
 
    // single
    var startX = 92 * w - w / 2;
    var startY = 4 * h;
 
    drawFirstBayerUndPreussDiamond(canvas, startX, startY);
    drawThreeBayerUndPreussDiamonds(canvas, startX, startY);
    drawFiveBayerUndPreussDiamonds(canvas, startX, startY);
}
 
function drawFirstBayerUndPreussDiamond(canvas, startX, startY) {
    var color = 'rgb(255,243,123)';
 
    var w = _diamondWidth * 2;
    var h = _diamondHeight * 2;
 
    if (canvas.getContext) {
        var context = canvas.getContext('2d');
 
        context.fillStyle = color;
        context.beginPath();
        context.moveTo(startX, startY);
        context.lineTo(startX + w / 2, startY + h / 2);
        context.lineTo(startX, startY + h);
        context.lineTo(startX - w / 2, startY + h / 2);
        context.lineTo(startX, startY);
        context.fill();
    }
}
 
function drawThreeBayerUndPreussDiamonds(canvas, startX, startY) {
 
    var color = 'rgb(255,243,123)';
 
    var w = _diamondWidth * 2;
    var h = _diamondHeight * 2;
 
    startX += 1.5 * _diamondWidth;
    startY -= 1.5 * _diamondHeight;
 
    if (canvas.getContext) {
        var context = canvas.getContext('2d');
 
        context.fillStyle = color;
        context.beginPath();
        context.moveTo(startX, startY);
        context.lineTo(startX + w * 1.25, startY + h * 1.25);
        context.lineTo(startX, startY + 2.5 * h);
        context.lineTo(startX - 0.5 * w, startY + 2 * h);
        context.lineTo(startX + 0.25 * w, startY + 1.25 * h);
        context.lineTo(startX - w / 2, startY + h / 2);
        context.lineTo(startX, startY);
        context.fill();
 
    }
}
 
function drawFiveBayerUndPreussDiamonds(canvas, startX, startY) {
 
    var color = 'rgb(255,243,123)';
 
    var w = _diamondWidth * 2;
    var h = _diamondHeight * 2;
 
    startX += 3 * _diamondWidth;
    startY -= 3 * _diamondHeight;
 
    if (canvas.getContext) {
        var context = canvas.getContext('2d');
 
        context.fillStyle = color;
        context.beginPath();
        context.moveTo(startX, startY);
        context.lineTo(startX + w * 2, startY + h * 2);
        context.lineTo(startX , startY + 4 * h);
        context.lineTo(startX - .5*w , startY + 3.5 * h);
        context.lineTo(startX + 1*w , startY + 2 * h);
        context.lineTo(startX - w / 2, startY + h / 2);
        context.lineTo(startX, startY);
        context.fill();
 
    }
}
 
</script>

~~Still need a solution for inner shadow on the shapes i am drawing, though….~~

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Frame Tween force playing forward // TweenLite

By: admin

04-04-2011

Actionscript, AS3, Effects

When having an external SWF file which needs to be tweened in frames ( e.g. multiple buttons to control the position of swf file ) it always throws performance issues while tweening a frame which is before the current frame ( meaning: reverse tweens ).

After some research i thankfully found following way to force a tween to play forward and loop to reach the desired frame. ( e.g. movie with totalframes 100 is at frame 50, button action: tween to frame 10 )

I was really glad i found this!

TweenLite is downloadable at : http://www.greensock.com/

// header
import com.greensock.TweenLite;
import com.greensock.plugins.*;
 
// function
TweenPlugin.activate( [ FramePlugin ] );
TweenPlugin.activate( [ FrameForwardPlugin ] );
 
var frameForward : uint = 10;
var time: Number = 1;
var _animation : Sprite = getChildByname("animation");
 
TweenLite.to( _animation, time, { frameForward:targetFrame, ease:"easeInOutExpo" } );

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— React-Native Programmierer . Patrick Tresp

HTML Canvas – draw within context and getImageData // patchwork effect

Frame Tween force playing forward // TweenLite

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