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Add opacity support.

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This commit is contained in:
Antoine Vandecreme 2015-04-19 16:10:37 -04:00
parent 5b64beab61
commit 44395662d1
4 changed files with 133 additions and 86 deletions
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182
src/drawer.js
View File

@ -96,6 +96,13 @@ $.Drawer = function( options ) {
*/
this.context = this.useCanvas ? this.canvas.getContext( "2d" ) : null;
/**
* Sketch canvas used to temporarily draw tiles which cannot be drawn directly
* to the main canvas due to opacity.
*/
this.sketchCanvas = this.useCanvas ? document.createElement( "canvas" ) : null;
this.sketchContext = this.useCanvas ? this.sketchCanvas.getContext( "2d" ) : null;
/**
* @member {Element} element
* @memberof OpenSeadragon.Drawer#
@ -111,8 +118,8 @@ $.Drawer = function( options ) {
// check canvas available width and height, set canvas width and height such that the canvas backing store is set to the proper pixel density
if (this.useCanvas) {
var viewportSize = this._calculateCanvasSize();
this.canvas.width = viewportSize.x;
this.canvas.height = viewportSize.y;
this.canvas.width = this.sketchCanvas.width = viewportSize.x;
this.canvas.height = this.sketchCanvas.height = viewportSize.y;
}
this.canvas.style.width = "100%";
@ -254,21 +261,23 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
* @param {OpenSeadragon.Tile} tile - The tile to draw.
* @param {Function} drawingHandler - Method for firing the drawing event if using canvas.
* drawingHandler({context, tile, rendered})
* @param {Boolean} useSketch - Whether to use the sketch canvas or not.
* where <code>rendered</code> is the context with the pre-drawn image.
*/
drawTile: function( tile, drawingHandler ) {
drawTile: function( tile, drawingHandler, useSketch ) {
$.console.assert(tile, '[Drawer.drawTile] tile is required');
$.console.assert(drawingHandler, '[Drawer.drawTile] drawingHandler is required');
if ( this.useCanvas ) {
var context = useSketch ? this.sketchContext : this.context;
// TODO do this in a more performant way
// specifically, don't save,rotate,restore every time we draw a tile
if( this.viewport.degrees !== 0 ) {
this._offsetForRotation( tile, this.viewport.degrees );
tile.drawCanvas( this.context, drawingHandler );
this._restoreRotationChanges( tile );
this._offsetForRotation( tile, this.viewport.degrees, useSketch );
tile.drawCanvas( context, drawingHandler );
this._restoreRotationChanges( tile, useSketch );
} else {
tile.drawCanvas( this.context, drawingHandler );
tile.drawCanvas( context, drawingHandler );
}
} else {
tile.drawHTML( this.canvas );
@ -276,63 +285,87 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
},
// private
saveContext: function() {
saveContext: function(useSketch) {
if (!this.useCanvas) {
return;
}
var context = useSketch ? this.sketchContext : this.context;
context.save();
},
// private
restoreContext: function(useSketch) {
if (!this.useCanvas) {
return;
}
var context = useSketch ? this.sketchContext : this.context;
context.restore();
},
// private
setClip: function(rect, useSketch) {
if (!this.useCanvas) {
return;
}
var context = useSketch ? this.sketchContext : this.context;
context.beginPath();
context.rect(rect.x, rect.y, rect.width, rect.height);
context.clip();
},
// private
drawRectangle: function(rect, fillStyle, useSketch) {
if (!this.useCanvas) {
return;
}
var context = useSketch ? this.sketchContext : this.context;
context.save();
context.fillStyle = fillStyle;
context.fillRect(rect.x, rect.y, rect.width, rect.height);
context.restore();
},
/**
* Blends the sketch canvas in the main canvas.
* The sketch canvas is then cleared.
* @param {Float} opacity The opacity of the blending.
* @returns {undefined}
*/
blendSketch: function(opacity) {
if (!this.useCanvas) {
return;
}
this.context.save();
},
// private
restoreContext: function() {
if (!this.useCanvas) {
return;
}
this.context.globalAlpha = opacity;
this.context.drawImage(this.sketchCanvas, 0, 0);
this.context.restore();
this.sketchContext.clearRect(0, 0,
this.sketchCanvas.width, this.sketchCanvas.height);
},
// private
setClip: function(rect) {
if (!this.useCanvas) {
return;
}
this.context.beginPath();
this.context.rect(rect.x, rect.y, rect.width, rect.height);
this.context.clip();
},
// private
drawRectangle: function(rect, fillStyle) {
if (!this.useCanvas) {
return;
}
this.context.save();
this.context.fillStyle = fillStyle;
this.context.fillRect(rect.x, rect.y, rect.width, rect.height);
this.context.restore();
},
// private
drawDebugInfo: function( tile, count, i ){
drawDebugInfo: function( tile, count, i, useSketch ){
if ( !this.useCanvas ) {
return;
}
this.context.save();
this.context.lineWidth = 2 * $.pixelDensityRatio;
this.context.font = 'small-caps bold ' + (13 * $.pixelDensityRatio) + 'px arial';
this.context.strokeStyle = this.debugGridColor;
this.context.fillStyle = this.debugGridColor;
var context = useSketch ? this.sketchContext : this.context;
context.save();
context.lineWidth = 2 * $.pixelDensityRatio;
context.font = 'small-caps bold ' + (13 * $.pixelDensityRatio) + 'px arial';
context.strokeStyle = this.debugGridColor;
context.fillStyle = this.debugGridColor;
if ( this.viewport.degrees !== 0 ) {
this._offsetForRotation( tile, this.canvas, this.context, this.viewport.degrees );
this._offsetForRotation( tile, this.viewport.degrees, useSketch );
}
this.context.strokeRect(
context.strokeRect(
tile.position.x * $.pixelDensityRatio,
tile.position.y * $.pixelDensityRatio,
tile.size.x * $.pixelDensityRatio,
@ -343,95 +376,97 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
var tileCenterY = (tile.position.y + (tile.size.y / 2)) * $.pixelDensityRatio;
// Rotate the text the right way around.
this.context.translate( tileCenterX, tileCenterY );
this.context.rotate( Math.PI / 180 * -this.viewport.degrees );
this.context.translate( -tileCenterX, -tileCenterY );
context.translate( tileCenterX, tileCenterY );
context.rotate( Math.PI / 180 * -this.viewport.degrees );
context.translate( -tileCenterX, -tileCenterY );
if( tile.x === 0 && tile.y === 0 ){
this.context.fillText(
context.fillText(
"Zoom: " + this.viewport.getZoom(),
tile.position.x * $.pixelDensityRatio,
(tile.position.y - 30) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Pan: " + this.viewport.getBounds().toString(),
tile.position.x * $.pixelDensityRatio,
(tile.position.y - 20) * $.pixelDensityRatio
);
}
this.context.fillText(
context.fillText(
"Level: " + tile.level,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 20) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Column: " + tile.x,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 30) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Row: " + tile.y,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 40) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Order: " + i + " of " + count,
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 50) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Size: " + tile.size.toString(),
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 60) * $.pixelDensityRatio
);
this.context.fillText(
context.fillText(
"Position: " + tile.position.toString(),
(tile.position.x + 10) * $.pixelDensityRatio,
(tile.position.y + 70) * $.pixelDensityRatio
);
if ( this.viewport.degrees !== 0 ) {
this._restoreRotationChanges( tile, this.canvas, this.context );
this._restoreRotationChanges( tile, useSketch );
}
this.context.restore();
context.restore();
},
// private
debugRect: function(rect) {
debugRect: function(rect, useSketch) {
if ( this.useCanvas ) {
this.context.save();
this.context.lineWidth = 2 * $.pixelDensityRatio;
this.context.strokeStyle = this.debugGridColor;
this.context.fillStyle = this.debugGridColor;
var context = useSketch ? this.sketchContext : this.context;
context.save();
context.lineWidth = 2 * $.pixelDensityRatio;
context.strokeStyle = this.debugGridColor;
context.fillStyle = this.debugGridColor;
this.context.strokeRect(
context.strokeRect(
rect.x * $.pixelDensityRatio,
rect.y * $.pixelDensityRatio,
rect.width * $.pixelDensityRatio,
rect.height * $.pixelDensityRatio
);
this.context.restore();
context.restore();
}
},
// private
_offsetForRotation: function( tile, degrees ){
_offsetForRotation: function( tile, degrees, useSketch ){
var cx = this.canvas.width / 2,
cy = this.canvas.height / 2,
px = tile.position.x - cx,
py = tile.position.y - cy;
this.context.save();
var context = useSketch ? this.sketchContext : this.context;
context.save();
this.context.translate(cx, cy);
this.context.rotate( Math.PI / 180 * degrees);
context.translate(cx, cy);
context.rotate( Math.PI / 180 * degrees);
tile.position.x = px;
tile.position.y = py;
},
// private
_restoreRotationChanges: function( tile ){
_restoreRotationChanges: function( tile, useSketch ){
var cx = this.canvas.width / 2,
cy = this.canvas.height / 2,
px = tile.position.x + cx,
@ -440,7 +475,8 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
tile.position.x = px;
tile.position.y = py;
this.context.restore();
var context = useSketch ? this.sketchContext : this.context;
context.restore();
},
// private

2
src/tile.js
View File

@ -67,7 +67,7 @@ $.Tile = function(level, x, y, bounds, exists, url) {
this.y = y;
/**
* Where this tile fits, in normalized coordinates
* @member {OpenSeadragon.Point} bounds
* @member {OpenSeadragon.Rect} bounds
* @memberof OpenSeadragon.Tile#
*/
this.bounds = bounds;

34
src/tiledimage.js
View File

@ -119,6 +119,12 @@ $.TiledImage = function( options ) {
delete options.height;
}
this.opacity = 1;
if ( options.opacity ) {
this.opacity = options.opacity;
delete options.opacity;
}
$.extend( true, this, {
//internal state properties
@ -1152,20 +1158,20 @@ function compareTiles( previousBest, tile ) {
function drawTiles( tiledImage, lastDrawn ) {
var i,
tile,
tileKey,
viewer,
viewport,
position,
tileSource;
tile;
if ( tiledImage.opacity <= 0 ) {
return;
}
var useSketch = tiledImage.opacity < 1;
var usedClip = false;
if ( tiledImage._clip ) {
tiledImage._drawer.saveContext();
tiledImage._drawer.saveContext(useSketch);
var box = tiledImage.imageToViewportRectangle(tiledImage._clip, true);
var clipRect = tiledImage._drawer.viewportToDrawerRectangle(box);
tiledImage._drawer.setClip(clipRect);
tiledImage._drawer.setClip(clipRect, useSketch);
usedClip = true;
}
@ -1181,17 +1187,17 @@ function drawTiles( tiledImage, lastDrawn ) {
fillStyle = tiledImage.placeholderFillStyle;
}
tiledImage._drawer.drawRectangle(placeholderRect, fillStyle);
tiledImage._drawer.drawRectangle(placeholderRect, fillStyle, useSketch);
}
for ( i = lastDrawn.length - 1; i >= 0; i-- ) {
tile = lastDrawn[ i ];
tiledImage._drawer.drawTile( tile, tiledImage._drawingHandler );
tiledImage._drawer.drawTile( tile, tiledImage._drawingHandler, useSketch );
tile.beingDrawn = true;
if( tiledImage.debugMode ) {
try {
tiledImage._drawer.drawDebugInfo( tile, lastDrawn.length, i );
tiledImage._drawer.drawDebugInfo( tile, lastDrawn.length, i, useSketch );
} catch(e) {
$.console.error(e);
}
@ -1217,7 +1223,11 @@ function drawTiles( tiledImage, lastDrawn ) {
}
if ( usedClip ) {
tiledImage._drawer.restoreContext();
tiledImage._drawer.restoreContext( useSketch );
}
if ( useSketch ) {
tiledImage._drawer.blendSketch( tiledImage.opacity );
}
}

1
src/viewer.js
View File

@ -1290,6 +1290,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
height: queueItem.options.height,
clip: queueItem.options.clip,
placeholderFillStyle: queueItem.options.placeholderFillStyle,
opacity: queueItem.options.opacity,
springStiffness: _this.springStiffness,
animationTime: _this.animationTime,
minZoomImageRatio: _this.minZoomImageRatio,