MyLittleCanvas

You find canvas hard to use ? try MyLittleCanvas :) Don't work with canvas methods, use objects instead !

For example, to add a custom underline on a textview

public class UnderlinedTextView extends android.support.v7.widget.AppCompatTextView {

    //define your canvas shapes
    final RoundRectShape roundRectShape = new RoundRectShape();

    public UnderlinedTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        roundRectShape
                .setCorderRadius(10)
                .setColor(Color.parseColor("#3F51B5"));
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        //customize your shapes
        roundRectShape
                .setWidth(w)
                .setHeight(10)
                .alignBottom(h);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //and finally draw
        roundRectShape.onDraw(canvas);
    }
}

dependencies {
    compile 'com.github.florent37:mylittlecanvas:(lastversion)'
}

Implementation

Shapes

• RectShape
• RoundRectShape
• TextShape
• LineShape
• DrawableShape
• PathShape
• CircleShape

Methods

.setColor(int)
.setWillNotDraw(boolean)
.getCenterX() / .getCenterY()
.getHeight() / .getWidth()

//rect / roundRect
.setRect(left, top, left, bottom)
.setLeft/Right/Top/Bottom(value)
.alignLeft/Right/Top/Bottom(value / shape)
.below(shape)
.above(shape)
.setCorderRadius(corner)
.marginLeft/Right/Top/Bottom(value / shape)

//text
.setText(text)
.setTextSizePx(size)
.setTypeface(typeface)
.centerIn(rectShape)
.configureH(minX, maxX)
.centerVertical(minY, maxY)

Graph Sample

Complete file, with all shaped and motion event manager

https://github.com/florent37/MyLittleCanvas/blob/master/app/src/main/java/canvastoolbox/florent37/github/com/canvastoolbox/MyTreeView.java

public class MyTreeView extends View {

    //define your canvas shapes
    ...
    RoundRectShape childLeft;
    TextShape textChildLeft;
    LineShape lineParentChildLeft;
    ...

    public MyTreeView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);

            //customize your shapes

            ...
            childLeft.setCorderRadius(10)
                    .setColor(Color.parseColor("#2196F3"));
            textChildLeft.setColor(Color.WHITE)
                    .setTextSizePx(40);
            lineParentChildLeft.setStrokeWith(3)
                    .setColor(Color.parseColor("#3E3E3E"));
            ...
    }

    @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);

            //setup your shapes
            childLeft.setLeft(40)
                            .setWidth(200)
                            .below(parent) //another shape
                            .marginTop(250)
                            .setHeight(100);

            textChildLeft.setText("childLeft");
            textChildLeft
                    .setAlignment(Layout.Alignment.ALIGN_CENTER)
                    .centerIn(childLeft);

            lineParentChildLeft
                    .start(parent.getCenterX(), parent.getBottom())
                    .end(childLeft.getCenterX(), childLeft.getTop());
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);

            ...
            //draw your shapes
            childLeft.onDraw(canvas);
            textChildLeft.onDraw(canvas);
            lineParentChildLeft.onDraw(canvas);
            ...
        }
}

Credits

Author: Florent Champigny http://www.florentchampigny.com/

Blog : http://www.tutos-android-france.com/

License

Copyright 2017 Florent37, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.